Medicare Claims Processing Manual Chapter 30 Guide

Name: Medicare Claims Processing Manual (Pub. 100-04)
Creator: Centers for Medicare & Medicaid Services
License: https://www.usa.gov/government-works

TL;DR

Chapter 30 of the Medicare Claims Processing Manual explains who pays when Medicare denies a claim. It covers the limitation on liability under section 1879 of the Social Security Act, the Advance Beneficiary Notice of Non-coverage and how to complete and deliver it, the home health, SNF and hospital notices, refund requirements, and the expedited determination process when a beneficiary disputes a discharge or a change from inpatient to outpatient status.

Chapter 30 at a glance

Current revision: Rev. 12934; Issued October 31, 2024
Effective: November 15, 2024; Implemented February 14, 2025
Sections: 294; 24 top-level sections
Official PDF: 195 pages; clm104c30.pdf
Transmittals in history: 29; Listed at the end of the chapter
Monthly searches: 40; Google Ads, US, October 2026

What chapter 30 governs for billing

Sections 20 to 40 set the legal frame. Under the limitation on liability provision, when Medicare denies a service as not reasonable and necessary or as custodial care, the beneficiary is liable only if he or she knew, or could reasonably have been expected to know, that Medicare would not pay; otherwise the provider bears the loss or Medicare pays. Written notice is the evidence of that knowledge, and section 40 sets the standards for it, including the exceptions for medical emergencies and EMTALA situations.

Section 50 is the Advance Beneficiary Notice of Non-coverage, Form CMS-R-131. It explains when an ABN is required and when it is optional (50.2 to 50.4), the standards for a valid notice, including a specific reason and a good-faith cost estimate, and how to complete, deliver and retain it (50.5 to 50.8). The claim tells the contractor that a valid ABN is on file with modifier GA, or that none was obtained with modifier GZ, and the effect of each on liability is described in 50.9. The section also covers ABNs for DMEPOS upgrades and competitive bidding items.

The rest of the chapter covers other notices: the Home Health Change of Care Notice (60), the SNF ABN (70), hospital-issued notices of noncoverage (80 and 240), indemnification and refund requirements for physicians and suppliers (100 to 150), the Important Message from Medicare and expedited reviews of inpatient discharges (200), notices of Medicare non-coverage when other provider services end (260), the Medicare Outpatient Observation Notice (400), and the Medicare Change of Status Notice used when a hospital reclassifies an inpatient to outpatient receiving observation services (450 and 460).

Sections billing teams use most

Section numbers and headings are CMS's; the notes are ours. Each section number opens the official chapter 30 PDF at the page where that section starts.

Key sections of Medicare Claims Processing Manual Chapter 30: Financial Liability Protections
Section	CMS heading	Why it matters
20.1	LOL Coverage Denials to Which the Limitation on Liability Applies	Coverage denials to which the limitation on liability applies.
40.2	Written Notice Standards	Standards a written notice must meet to show the beneficiary knew Medicare would not pay.
50.3	Issuance of the ABN	When and how an ABN must be issued.
50.6	Completing the ABN	Completing the ABN, including the reason and cost estimate.
50.9	Effects of Lack of Notification, Medicare Review and Claim Adjudication	Effect of a missing or defective ABN on liability and claim adjudication.
70.2	Situations in Which a SNF ABN Should Be Given	Situations in which a SNF must give the SNF ABN.
450.3	Medicare Change of Status Notice (MCSN)	The Medicare Change of Status Notice for inpatient-to-outpatient reclassification.

How chapter 30 shows up on claims and denials

Liability shows up in the group code on the remittance. A reasonable-and-necessary denial with a valid ABN on file, reported with modifier GA, is assigned to the patient, so the provider can bill the beneficiary; the same denial without an ABN, reported with modifier GZ or with no modifier, is assigned to the provider and cannot be collected from the beneficiary. The denial reason itself is usually reason code 50, not deemed a medical necessity.

An ABN does not shift liability for everything. Services excluded by statute are the beneficiary's responsibility without an ABN and are reported with modifier GY, and an ABN can be given voluntarily for them. Coding denials such as NCCI and MUE edits are never shifted to the beneficiary, and a notice that is generic, unsigned or delivered too late to allow a real choice is treated as no notice.

Codes you are likely to see on the remittance when a claim runs into this chapter's rules. The code pages explain each code's meaning, root causes and the usual fix.

Remittance codes associated with Medicare Claims Processing Manual Chapter 30: Financial Liability Protections
Code	Type	When it appears
50	Claim adjustment reason code	Not deemed a medical necessity; liability depends on the ABN.
96	Claim adjustment reason code	Non-covered charge, for example a statutorily excluded service.
204	Claim adjustment reason code	Service not covered under the patient's current benefit plan.

Current revision and recent transmittals

The chapter PDF posted on cms.gov is current through Rev. 12934, issued October 31, 2024, effective November 15, 2024, implemented February 14, 2025 (change request 13846). That revision changed sections 450 (Expedited Determinations When a Beneficiary is Reclassified from an Inpatient to an Outpatient Receiving Observation Services), 450.1 (Authority), 450.2 (Scope), 450.3 (Medicare Change of Status Notice (MCSN)), 450.3.1 (Alterations to the MCSN), 450.3.2 (Hospital Delivery of the MCSN), 450.3.3 (Required Delivery Timeframes of the MCSN), 450.3.4 (Refusal to Sign the MCSN). Its subject line reads: “Medicare Change of Status Notice (MCSN) Manual Instructions-”.

The newest rows of the transmittal history printed at the end of the chapter (29 revisions in all). Rows whose subject could not be read reliably from the PDF table are left out; the PDF has the complete list.

Newest transmittals for Medicare Claims Processing Manual Chapter 30: Financial Liability Protections
Revision	Issued	Subject	CR
R12934CP	October 31, 2024	Medicare Change of Status Notice (MCSN) Manual Instructions-	13846
R12758CP	August 1, 2024	Revisions to the Skilled Nursing Facility (SNF) Advance Beneficiary Notice of Non-Coverage (ABN)	13621
R12423CP	December 20, 2023	Enforcing Billing Requirements for Intensive Outpatient Program (IOP) Services with New Condition Code 92	13222
R11210CP	January 21, 2022	Expedited Review Process for Hospital Inpatients in Original Medicare	12546
R10862CP	July 14, 2021	Section 50 in Chapter 30 of Publication (Pub.) 100-04 Manual Updates	12242
R4250CP	March 8, 2019	Update to Chapter 30 in Publication (Pub.) 100-04 to Provide Language-Only Changes for the New Medicare Card Project	11165

Sections ordered by the date in the revision note printed under each heading.

Most recently revised sections of Medicare Claims Processing Manual Chapter 30: Financial Liability Protections
Section	Heading	Revision
450	Expedited Determinations When a Beneficiary is Reclassified from an Inpatient to an Outpatient Receiving Observation Services	Rev. 12934, October 31, 2024; effective November 15, 2024
450.1	Authority	Rev. 12934, October 31, 2024; effective November 15, 2024
450.2	Scope	Rev. 12934, October 31, 2024; effective November 15, 2024
450.3	Medicare Change of Status Notice (MCSN)	Rev. 12934, October 31, 2024; effective November 15, 2024
450.3.1	Alterations to the MCSN	Rev. 12934, October 31, 2024; effective November 15, 2024
450.3.2	Hospital Delivery of the MCSN	Rev. 12934, October 31, 2024; effective November 15, 2024
450.3.3	Required Delivery Timeframes of the MCSN	Rev. 12934, October 31, 2024; effective November 15, 2024
450.3.4	Refusal to Sign the MCSN	Rev. 12934, October 31, 2024; effective November 15, 2024

Section index

Every section in the chapter's table of contents, grouped under its top-level heading, with the PDF page where it starts. Open a heading to see its subsections.

10 Financial Liability Protections (FLP) Provisions · p. 12

Open section 10 in the PDF

20 Limitation On Liability (LOL) Under §1879 Where Medicare Claims Are Denied · p. 12 · 3 subsections

Open section 20 in the PDF
20.1 LOL Coverage Denials to Which the Limitation on Liability Applies · p. 14
20.2 Denials When the LOL Provision Does Not Apply · p. 16
20.2.1 Categorical Denials · p. 18

30 Determining Liability for Disallowed Claims Under §1879 · p. 19 · 8 subsections

Open section 30 in the PDF
30.1 Beneficiary's Knowledge and Liability · p. 21
30.1.1 Other Evidence of Knowledge · p. 22
30.2 Healthcare Provider or Supplier Knowledge and Liability · p. 22
30.2.1 Evidence of Healthcare Provider or Supplier Knowledge · p. 23
30.2.2 Medical Record Evidence of Healthcare Provider or Supplier Knowledge · p. 23
30.2.3 Acceptable Standards of Practice · p. 24
30.3 The Right to Appeal · p. 25
30.4 Fraud, Abuse, Patently Unnecessary Items and Services · p. 25

40 Written Notice as Evidence of Knowledge · p. 26 · 6 subsections

Open section 40 in the PDF
40.1 Sources of Written Notice · p. 26
40.2 Written Notice Standards · p. 27
40.2.1 Other Written Notice Standards · p. 29
40.2.2 Written Notice Special Considerations · p. 30
40.3 Medical Emergency or Otherwise Under Great Duress Situations · p. 34
40.4 Emergency Medical Treatment and Active Labor Act (EMTALA) Situations · p. 35

50 Advance Beneficiary Notice of Non-coverage (ABN) · p. 35 · 23 subsections

Open section 50 in the PDF
50.1 ABN Scope · p. 37
50.2 ABN Uses · p. 37
50.2.1 Optional ABN Uses · p. 38
50.3 Issuance of the ABN · p. 39
50.4 ABN Triggering Events · p. 40
50.5 ABN Standards · p. 41
50.6 Completing the ABN · p. 43
50.7 Retention Requirements · p. 44
50.8 ABN Delivery Requirements · p. 45
50.8.1 Options for Delivery Other than In-Person · p. 46
50.9 Effects of Lack of Notification, Medicare Review and Claim Adjudication · p. 47
50.10 Using ABNs for Medical Equipment and Supplies Claims When Denials Under §1834(a)(17)(B) of the Act (Prohibition Against Unsolicited Telephone Contacts) Are Expected · p. 48
50.11 ABNs for Medical Equipment and Supplies Claims Denied Under §1834(j)(1) of the Act (Because the Supplier Did Not Meet Supplier Number Requirements) · p. 48
50.12 ABNs for Claims Denied in Advance Under §1834(a)(15) of the Act · p. 50
50.13 ABN Standards for Upgraded Durable Medical Equipment, Prosthetics, Orthotics, and Supplies (DMEPOS) · p. 51
50.14 ABNs for items listed in a DMEPOS Competitive Bidding Program (CBP) · p. 51
50.15 Collection of Funds and Refunds · p. 52
50.15.1 Physicians' Services RR · p. 52
50.15.2 DMEPOS RR Provision for Claims for Medical Equipment and Supplies · p. 53
50.15.3 Time Limits and Penalties for Healthcare Providers and Suppliers in Making Refunds · p. 54
50.15.4 Supplier's Right to Recover Resalable Items for Which Refund Has Been Made · p. 54
50.16 CMS Regional Office (RO) Referral Procedures · p. 55
50.17 ABN Special Considerations · p. 56

60 Home Health Change of Care Notice (HHCCN), Form CMS-10280 · p. 62 · 5 subsections

Open section 60 in the PDF
60.1 Background on the HHCCN · p. 63
60.2 Scope of the HHCCN · p. 64
60.3 Triggering Events for HHCCN/ Written Notice · p. 65
60.4 Completing the HHCCN · p. 69
60.5 HHCCN Delivery · p. 70

70 Skilled Nursing Facility Advance Beneficiary Notice of Non-Coverage (SNF ABN) · p. 71 · 7 subsections

Open section 70 in the PDF
70.1 SNF ABN Standards · p. 72
70.2 Situations in Which a SNF ABN Should Be Given · p. 72
70.3 Situations in Which a SNF ABN Is Not Needed to Transfer Financial Liability to the Beneficiary · p. 74
70.4 SNF ABN Specific Delivery Issues · p. 75
70.5 Special Rules for SNF ABNs · p. 75
70.6 Establishing When Beneficiary Is On Notice of Non-coverage · p. 77
70.6.1 Source of Beneficiary Notification · p. 77

80 Hospital ABNs (Hospital-Issued Notices of Noncoverage - HINN) · p. 78

Open section 80 in the PDF

100 Indemnification Procedures for Claims Falling Within the Limitation on Liability Provision · p. 78 · 11 subsections

Open section 100 in the PDF
100.1 Contractor and Social Security Office (SSO) Responsibility in Indemnification Claims · p. 78
100.2 Conditions for Indemnification · p. 79
100.3 Development and Documentation of Indemnification Requests · p. 81
100.3.1 Proof of Payment · p. 81
100.4 Beneficiary Requests Indemnification, but Had No Financial Interest in the Claim · p. 82
100.5 Questionable Indemnification Requests Procedure · p. 83
100.6 Determining the Amount of Indemnification · p. 83
100.7 Notifying the Provider, Practitioner, or Supplier · p. 83
100.8 Making Payment Under Indemnification · p. 84
100.9 Limitation on Liability Determination Does Not Affect Medicare Exclusion · p. 84
100.10 Exhibits · p. 85

110 Contractor Instructions for Application of Limitation On Liability · p. 89 · 8 subsections

Open section 110 in the PDF
110.1 Payment Under Limitation on Liability · p. 89
110.2 When to Make Limitation on Liability Decisions · p. 90
110.3 Preparation of Denial Notices · p. 91
110.4 Bill Processing · p. 92
110.5 Contractor Review of ABNs · p. 93
110.5.1 General Rules · p. 93
110.5.2 Situations in Which Contractor Review of ABNs is Indicated · p. 93
110.5.3 Other Reasons for Contractor Request for Copies of ABNs · p. 94

120 Contractor Specific Instructions for Application of Limitation on Liability · p. 95 · 6 subsections

Open section 120 in the PDF
120.1 Documentation of Notices Regarding Coverage · p. 95
120.2 Availability of Coverage Notices to Operating Personnel · p. 95
120.3 Applicability of Limitation on Liability Provision to Claims for Outpatient Physical Therapy Services Furnished by Clinics · p. 96
120.4 Limitation on Liability Notices to Beneficiaries From Contractors · p. 96
120.5 Contractor Redeterminaions or Reconsiderations in Assignment Cases Conducted at the Request of Either the Beneficiary or the Assignee · p. 97
120.5.1 Guide Paragraphs for Contractors to Use Where §1879 Is Applicable at Redetermination Level · p. 97

130 A/B MAC (A) and (HHH) Specific Instructions for Application of Limitation on Liability · p. 100 · 6 subsections

Open section 130 in the PDF
130.1 Applicability of the Limitation on Liability Provision to Claims for Ancillary, Outpatient Provider and Rural Health Clinic Services Payable Under Part B · p. 100
130.1.1 Determining Beneficiary Liability in Claims for Ancillary and Outpatient Services · p. 100
130.1.2 Determining Provider Liability in Claims for Ancillary and Outpatient Services · p. 101
130.2 Prior Hospitalization and Transfer Requirements for SNF Coverage as Related to Limitation on Liability · p. 101
130.3 Application of Limitation on Liability to SNF and Hospital Claims for Services Furnished in Noncertified or Inappropriately Certified Beds · p. 102
130.4 Determining Liability for Services Furnished in a Noncertified SNF or Hospital Bed · p. 104

140 Physician Refund Requirements (RR) Provision for Nonassigned Claims for Physicians Services Under §1842(l) - Instructions for Contractors and Physicians · p. 106 · 17 subsections

Open section 140 in the PDF
140.1 Services Furnished Before October 1, 1987 · p. 106
140.2 Services Furnished Beginning October 1, 1987 · p. 106
140.3 Time Limits for Making Refunds · p. 107
140.4 Situations Where a Refund Is Not Required · p. 108
140.5 Appeal Rights · p. 108
140.6 Processing Initial Denials · p. 109
140.6.1 Initial Beneficiary Notices · p. 109
140.6.2 Initial Physician Notices · p. 110
140.7 Processing Beneficiary Requests for Appeal · p. 112
140.8 Processing Physician Requests for Appeal · p. 113
140.8.1 Appeal of the Denial or Reduction in Payment · p. 113
140.8.2 Beneficiary Given ABN and Agreed to Pay · p. 113
140.8.3 Physician Knowledge · p. 113
140.9 Guide Paragraphs for Inclusion in Appeal Determination · p. 113
140.10 Physician Fails to Make Refund · p. 115
140.11 OIG Referral Procedures · p. 115
140.12 Imposition of Sanctions · p. 116

150 DMEPOS Refund Requirements (RR) Provision for Claims for Medical Equipment and Supplies under §§1834(a)(18), 1834(j)(4), and 1879(h) - Instructions for Contractors and Suppliers · p. 116 · 38 subsections

Open section 150 in the PDF
150.1 Definition of Medical Equipment and Supplies · p. 117
150.1.1 Unassigned Claims Denied on the Basis of the Prohibition on Unsolicited Telephone Contacts · p. 117
150.1.2 Unassigned Claims Denied on the Basis of Not Being Reasonable and Necessary · p. 117
150.1.3 Unassigned Claims Denied on the Basis of Failure of the Supplier to Meet Supplier Number Requirements · p. 118
150.1.4 Assigned Claims Denied on the Basis of the Prohibition on Unsolicited Telephone Contacts · p. 118
150.1.5 Assigned Claims Denied on the Basis of Failure of the Supplier to Meet Supplier Number Requirements · p. 119
150.1.6 Assigned Claims Denied on the Basis of Not Being Reasonable and Necessary · p. 119
150.2 Items and Services Furnished on an Unassigned Basis on or After January 1, 1995 · p. 120
150.3 Items and Services Furnished On an Assigned Basis On or After January 1, 1995
150.4 Time Limits for Making Refunds · p. 121
150.5 Supplier Knowledge Standards for Waiver of Refund Requirement · p. 121
150.5.1 Knowledge Standards for §1862(a)(1) Denials · p. 122
150.5.2 Knowledge Standards for §1834(a)(15) Denials · p. 122
150.5.2.1 Denial of Payment in Advance · p. 122
150.5.2.2 When a Request for an Advance Determination of Coverage Is Mandatory · p. 122
150.5.2.3 When a Request for an Advance Determination of Coverage Is Optional · p. 122
150.5.2.4 Presumption for Constructive Notice · p. 123
150.5.2.5 Presumption When Advance Determination was Requested · p. 123
150.5.2.6 Presumption for Listed Overutilized Items · p. 123
150.5.2.7 Presumption for Listed Suppliers · p. 123
150.5.2.8 Presumption for Medical Necessity · p. 124
150.5.2.9 Presumption About Beneficiary Knowledge · p. 124
150.5.3 Knowledge Standards for §1834(a)(17)(B) Denials · p. 124
150.5.4 Knowledge Standards for §1834(j)(1) Denials · p. 124
150.5.5 Additional Knowledge Standards for All Medical Equipment and Supplies Denials · p. 125
150.6 Advance Beneficiary Notice Standards for Waiver of Refund Requirement · p. 125
150.7 Appeal Rights · p. 125
150.8 Processing Initial Denials · p. 126
150.9 Processing Beneficiary Requests for Appeal · p. 129
150.10 Processing Supplier Requests for Appeal · p. 129
150.10.1 Appeal of the Denial of Payment · p. 129
150.10.2 Beneficiary Given Advance Beneficiary Notice and Agreed to Pay · p. 130
150.10.3 Supplier Knowledge · p. 130
150.11 Guide Paragraphs for Inclusion in Appeal Determination · p. 130
150.12 Supplier Fails to Make Refund · p. 132
150.13 CMS Regional Office (RO) Referral Procedures · p. 132
150.14 Imposition of Sanctions · p. 134
150.15 Supplier's Right to Recover Resaleable Items for Which Refund Has Been Made · p. 134

200 Expedited Determinations of Inpatient Hospital Discharges · p. 135 · 33 subsections

Open section 200 in the PDF
200.1 Statutory Authority · p. 135
200.2 Scope · p. 135
200.2.1 Exceptions · p. 136
200.3 Important Message from Medicare (IM) · p. 137
200.3.1 Alterations to the IM · p. 137
200.3.2 Completing the IM · p. 137
200.3.3 Hospital Delivery of the IM · p. 138
200.3.4 Required Delivery Timeframes · p. 138
200.3.4.1 First IM · p. 138
200.3.4.2 Follow-up copy of the IM · p. 139
200.3.5 Refusal to Sign the IM
200.3.6 Amending the Date of the IM · p. 140
200.3.7 IM Delivery to Representatives · p. 140
200.3.8 Notice Retention for the IM · p. 142
200.4 Expedited Determination Process · p. 142
200.4.1 Beneficiary Responsibilities · p. 142
200.4.1.1 Timeframe for Requesting an Expedited Determination · p. 142
200.4.1.2 Provide Information to BFCC-QIO · p. 142
200.4.2 Beneficiary Liability During BFCC-QIO Review · p. 143
200.4.3 Untimely Requests for Review · p. 143
200.4.4 Hospital Responsibilities · p. 144
200.4.5 The Detailed Notice of Discharge (DND) · p. 144
200.5 BFCC-QIO Responsibilities · p. 145
200.5.1 Receive Beneficiary Requests for Expedited Review · p. 145
200.5.2 Notify Hospitals and Allow Explanation of Why Covered Services Should End · p. 145
200.5.3 Validate Delivery of IM · p. 145
200.5.4 Solicit the Views of the Beneficiary · p. 146
200.5.5 Solicit the Views of the Hospital · p. 146
200.5.6 Make Determination and Notify Required Parties · p. 146
200.6 Effect of a BFCC-QIO Expedited Determination · p. 147
200.6.1 Right to Pursue an Expedited Reconsideration · p. 147
200.6.2 Effect of BFCC-QIO Determination on Continuation of Care · p. 147
200.6.3 Right to Pursue the Standard Claims Appeal Process · p. 147

220 Hospital Requested Expedited Review · p. 147 · 5 subsections

Open section 220 in the PDF
220.1 Responsibilities of the Hospital
220.2 Responsibilities of the QIO · p. 148
220.3 Effect of the Hospital Requested Expedited Determination · p. 149
220.4 General Notice Requirements · p. 149
220.5 Exhibit 3 - Model Language Notice of Hospital Requested Review (HRR) · p. 149

240 Preadmission/Admission Hospital Issued Notice of Noncoverage (HINN) · p. 151 · 6 subsections

Open section 240 in the PDF
240.1 Delivery of the Preadmission/Admission HINN · p. 151
240.2 Notice Delivery Timeframes and Liability · p. 151
240.3 Timeframes for Submitting a Request for a QIO Review · p. 152
240.4 Results of the QIO Review · p. 152
240.5 Effect of the QIO Review · p. 152
240.6 Exhibit 4 - Model Language Preadmission/Admission Hospital Issued Notice of Noncoverage · p. 153

260 Expedited Determinations of Provider Service Terminations · p. 156 · 34 subsections

Open section 260 in the PDF
260.1 Statutory Authority · p. 156
260.2 Scope · p. 156
260.2.1 Exceptions · p. 157
260.3 Notice of Medicare Non-Coverage · p. 157
260.3.1 Alterations to the NOMNC · p. 157
260.3.2 Completing the NOMNC · p. 158
260.3.3 Provider Delivery of the NOMNC · p. 158
260.3.4 Required Delivery Timeframes · p. 159
260.3.5 Refusal to Sign the NOMNC · p. 159
260.3.6 Financial Liability for Failure to Deliver a Valid NOMNC · p. 160
260.3.7 Amending the Date of the NOMNC · p. 160
260.3.8 NOMNC Delivery to Representatives · p. 160
260.3.9 Notice Retention for the NOMNC · p. 162
260.3.10 Hours of NOMNC Delivery · p. 162
260.4 Expedited Determination Process · p. 162
260.4.1 Beneficiary Responsibilities · p. 162
260.4.1.1 Timeframe for Requesting an Expedited Determination · p. 162
260.4.1.2 Provide Information to QIO · p. 163
260.4.1.3 Obtain Physician Certification of Risk (Home Health and CORF services only) · p. 163
260.4.2 Beneficiary Liability During QIO Review · p. 163
260.4.3 Untimely Requests for Review · p. 163
260.4.4 Provider Responsibilities · p. 164
260.4.5 The Detailed Explanation of Non-Coverage · p. 164
260.5 QIO Responsibilities · p. 167
260.5.1 Receive Beneficiary Requests for Expedited Review · p. 167
260.5.2 Notify Providers and Allow Explanation of Why Covered Services Should End · p. 167
260.5.3 Validate Delivery of NOMNC · p. 167
260.5.4 Solicit the Views of the Beneficiary · p. 168
260.5.5 Solicit the Views of the Provider · p. 168
260.5.6 Make Determination and Notify Required Parties · p. 168
260.6 Effect of a QIO Expedited Determination · p. 169
260.6.1 Right to Pursue an Expedited Reconsideration · p. 169
260.6.2 Effect of QIO Determination on Continuation of Care · p. 169
260.6.3 Right to Pursue the Standard Claims Appeal Process · p. 170

261 Expedited Determination Notice Association with Advance Beneficiary Notices · p. 170

Open section 261 in the PDF

300 Expedited Reconsiderations · p. 170 · 5 subsections

Open section 300 in the PDF
300.1 The Role of the Beneficiary and Liability · p. 171
300.2 The Responsibilities of the IRE · p. 171
300.3 The Responsibilities of the QIO · p. 172
300.4 The Responsibilities of the Provider · p. 172
300.5 Coverage During an Expedited Reconsideration · p. 172

400 Part A Medicare Outpatient Observation Notice · p. 172 · 13 subsections

Open section 400 in the PDF
400.1 Statutory Authority · p. 172
400.2 Scope · p. 173
400.3 Medicare Outpatient Observation Notice · p. 174
400.3.1 Alterations to the MOON · p. 174
400.3.2 Completing the MOON · p. 174
400.3.3 Hospital Delivery of the MOON · p. 175
400.3.4 Required Delivery Timeframes · p. 175
400.3.5 Refusal to Sign the MOON · p. 175
400.3.6 MOON Delivery to Representatives · p. 176
400.3.7 Ensuring Beneficiary Comprehension · p. 177
400.3.8 Completing the Additional Information Field of the MOON · p. 177
400.3.9 Notice Retention for the MOON · p. 178
400.4 Intersection with State Observation Notices · p. 178

450 Expedited Determinations When a Beneficiary is Reclassified from an Inpatient to an Outpatient Receiving Observation Services · p. 178 · 24 subsections

Open section 450 in the PDF
450.1 Authority · p. 179
450.2 Scope · p. 179
450.3 Medicare Change of Status Notice (MCSN) · p. 179
450.3.1 Alterations to the MCSN · p. 179
450.3.2 Hospital Delivery of the MCSN · p. 180
450.3.3 Required Delivery Timeframes of the MCSN · p. 180
450.3.4 Refusal to Sign the MCSN · p. 181
450.3.5 Ensuring Beneficiary Comprehension · p. 181
450.3.6 MCSN Delivery to Representatives · p. 181
450.3.7 Notice Retention for the MCSN · p. 183
450.4 Expedited Determination Process · p. 183
450.4.1 Beneficiary Responsibilities · p. 183
450.4.1.1 Timeframes for Requesting an Expedited Determination · p. 183
450.4.1.2 Provide Information to BFCC-QIO · p. 184
450.4.2 Beneficiary Liability During BFCC-QIO Review · p. 184
450.4.3 Hospital Responsibilities · p. 184
450.5 BFCC-QIO Responsibilities · p. 184
450.5.1 Receive Beneficiary Requests for Expedited Review · p. 184
450.5.2 Notify Hospitals · p. 185
450.5.3 Validate Delivery of the MCSN · p. 185
450.5.4 Solicit the Views of the Beneficiary · p. 185
450.5.5 Solicit the Views of the Hospital · p. 185
450.5.6 Make Determination and Notify Required Parties · p. 185
450.6 Effect of a BFCC-QIO Expedited Determination · p. 186

460 Expedited Reconsiderations · p. 186 · 12 subsections

Open section 460 in the PDF
460.1 Beneficiary Responsibilities · p. 186
460.1.1 Timeframe for Requesting an Expedited Reconsideration · p. 186
460.1.2 Provide Information to the BFCC-QIO · p. 187
460.1.3 Beneficiary Liability During BFCC-QIO · p. 187
460.2 Hospital Responsibilities · p. 187
460.3 BFCC-QIO Responsibilities · p. 187
460.3.1 Receive Beneficiary requests for Expedited Reconsiderations · p. 187
460.3.2 Notify Hospitals · p. 187
460.3.3 Solicit the Views of the Beneficiary · p. 187
460.3.4 Solicit the Views of the Hospital · p. 188
460.3.5 Make Determination and Notify Required Parties · p. 188
460.4 Effect of a BFCC-QIO Expedited Reconsideration · p. 188

500 Glossary · p. 188

Open section 500 in the PDF

Using this chapter in a denial or appeal

Start with the remittance. The claim adjustment reason code says what happened to the line, the remark code narrows it, and the group code says who is liable. Match that to the section of the chapter that sets the rule, then read the section in the official PDF rather than a summary: the wording that matters, such as a time limit, a modifier requirement or a documentation element, is usually a single sentence. Check the revision note under the section heading, because a rule that changed after the date of service may not apply to the claim, and an effective date earlier than the issue date can make a new rule reach back.

When the chapter supports the claim, cite it precisely in the redetermination request: the publication number, chapter, section and revision. When it does not, the fix is usually a corrected claim or better documentation rather than an appeal, and a coding or format rejection is corrected and resubmitted because it carries no appeal rights. Manual instructions bind the Medicare Administrative Contractor, so they settle most first-level disputes; at the hearing level, administrative law judges give them substantial deference without being bound by them. If the issue turns on whether a service is covered at all, read the matching Benefit Policy Manual chapter and any national coverage determination or local coverage determination as well, because coverage and billing rules are written in different places.

How QuickIntell works with Claims Processing Manual chapter 30

QuickRCM covers eligibility, claim readiness, denials, posting and A/R with configurable automation and human review, which is where the billing rules in this chapter are checked before a claim goes out. QuickCode supports qualified coder review of the coding and modifier questions the chapter answers.

See QuickRCM for claim readiness See QuickCode for coder review Book a meeting

Frequently asked questions: chapter 30

Where are the ABN rules in the Medicare manuals?

Chapter 30 section 50 of the Medicare Claims Processing Manual (Pub. 100-04). It covers when an ABN is required, the form CMS-R-131, how to complete and deliver it, retention and the effect of a missing or defective notice.

What is the difference between modifiers GA and GZ?

GA tells Medicare that a valid ABN is on file, so the beneficiary can be held liable if the service is denied as not reasonable and necessary; GZ says the provider expects a denial but has no ABN, so the provider bears the liability.

What is the MCSN?

The Medicare Change of Status Notice, added to chapter 30 sections 450 and 460, informs a beneficiary who is reclassified from inpatient to outpatient receiving observation services of the right to an expedited determination by the BFCC-QIO.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Medicare Claims Processing Manual, Chapter 30: Financial Liability Protections
Version Rev. 12934, issued 2024-10-31 · effective 2024-11-15 · file clm104c30.pdfSHA-256 f4889372e5051708…
Medicare Claims Processing Manual (Pub. 100-04)
Version 39 chapter PDFs; newest revision Rev. 13836 (chapter 14), issued 2026-06-24 · effective 2026-09-27 · file 100-04-claims-processing-manual/*.pdf (39 chapters; SHA-256 of their sha256sum listing)SHA-256 f87bc3bcd9d1570d…

Disclaimer

This guide summarizes a CMS manual chapter in our own words for billing teams; section headings and transmittal subjects are quoted from the chapter PDF. The chapter itself is the authority, and it changes by transmittal. Not legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.

Medicare Claims Processing Manual Chapter 30: Financial Liability Protections