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HCPCS A4483 · Level II · A code

A4483: Moisture exchanger, disposable, for use with invasive mechanical ventilation, HCPCS Level II A code

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: HCPCS Level II file: October 2026 (effective October 1, 2026); PFS relative value file: RVU26D, released August 26, 2026 (effective October 1, 2026); DMEPOS fee schedule: DME26-D (October 2026) (effective October 1, 2026); NCCI MUE tables: 2026 Q4 (effective October 1, 2026); NCCI PTP edits: v323r0 (2026 Q4) (effective October 1, 2026); OPPS Addendum B: October 2026 (effective October 1, 2026). Next CMS release: January 1, 2027 (quarterly update) for the HCPCS Level II file and DMEPOS fee schedule and NCCI MUE tables and NCCI PTP edits and OPPS Addendum B; RVU27A with the CY2027 PFS final rule, effective January 1, 2027 for the PFS relative value file.

Key facts for A4483

Medicare payment
no DMEPOS fee
DMEPOS category OS, no ceiling or state fee
Coverage code
D
special coverage instructions apply
DME supplier MUE
30
MAI 3
OPPS status
SI N
Items and Services packaged into APC rates
NCCI PTP pairs
0
practitioner file
LCDs and articles
0 / 0

TL;DR

HCPCS Level II A4483 reads "Moisture exchanger, disposable, for use with invasive mechanical ventilation" in the October 2026 file; it dates from 1999. The October 2026 DMEPOS fee schedule lists A4483 in category OS (ostomy, tracheostomy and urological items) without a ceiling, floor or state fee; its HCPCS pricing indicator is 37 (DMEPOS ostomy, tracheostomy and urological supplies (floors and ceilings)). MUE limits for A4483: practitioner 0 (MAI 3, CMS Policy); hospital outpatient 1 (MAI 3, Clinical: CMS Workgroup); DME supplier 30 (MAI 3, Clinical: Data). No current LCD or billing article lists A4483; its HCPCS coverage code is D (special coverage instructions apply). OPPS status indicator N: Items and Services packaged into APC rates. HCPCS record: BETOS D1F (prosthetic/orthotic devices); pricing indicator 37; type of service P (lump-sum purchase of DME, prosthetics or orthotics). Nearby codes: A4452, A4450, A4414, A4556.

A4483 descriptor and code status

The October 2026 HCPCS Level II file describes A4483 as “Moisture exchanger, disposable, for use with invasive mechanical ventilation”. It sits in the A section (transportation, medical and surgical supplies, administrative, miscellaneous and investigational), listed with the other A codes.

HCPCS file attributes of A4483
FieldValue
Short descriptorMoisture exchanger
Added to HCPCS1999-01-01
Last actionN (no maintenance), effective 2003-01-01
Coverage codeD: special coverage instructions apply
Pricing indicator37: DMEPOS ostomy, tracheostomy and urological supplies (floors and ceilings)
BETOS categoryD1F: prosthetic/orthotic devices
Type of serviceP: lump-sum purchase of DME, prosthetics or orthotics

Medicare payment for A4483

The October 2026 DMEPOS fee schedule lists A4483 in category OS (ostomy, tracheostomy and urological items) without a ceiling, floor or state fee; its HCPCS pricing indicator is 37 (DMEPOS ostomy, tracheostomy and urological supplies (floors and ceilings)). The amounts below are national figures from the October 2026 CMS files; the contractor applies the locality, rural or state adjustment and the beneficiary's cost sharing.

Physician fee schedule (RVU26D)

Status X: statutory exclusion: not a physician service under the fee schedule. Global period XXX (global surgery concept does not apply); PC/TC indicator 9 (professional/technical concept does not apply).

DMEPOS fee schedule (DME26-D)

Jurisdiction D (DME MAC), payment category OS (ostomy, tracheostomy and urological items). Fees are set per state; AK, HI, PR and VI are not subject to the national ceiling and floor and are listed separately. A rural fee applies only in ZIP codes on the CMS rural ZIP list.

DMEPOS fees for A4483 by modifier
ModifierFloor / ceilingNon-rural state rangeRural rangeAK / HI / PR / VI
none————

Hospital outpatient (OPPS Addendum B)

Status indicator N (Items and Services packaged into APC rates), with no separate OPPS payment rate.

Medically Unlikely Edits for A4483

MUE limits for A4483: practitioner 0 (MAI 3, CMS Policy); hospital outpatient 1 (MAI 3, Clinical: CMS Workgroup); DME supplier 30 (MAI 3, Clinical: Data). The DME supplier MUE is a date-of-service clinical edit: units above the limit deny but can be paid on appeal with documentation.

MUE values for A4483 by setting
SettingMUE (units/DOS)MAICMS rationale
Practitioner services03 Date of Service Edit: ClinicalCMS Policy
Facility outpatient hospital13 Date of Service Edit: ClinicalClinical: CMS Workgroup
DME supplier303 Date of Service Edit: ClinicalClinical: Data

The MUE lookup for A4483 shows every setting next to any other code on the same claim.

NCCI edits and add-on rules

No active practitioner PTP pair lists A4483 in v323r0.

A4483 is neither an add-on code nor a designated primary code in the 2026 Q4 NCCI add-on edit file.

Pair counts show exposure, not the answer for one claim. Check A4483 against a second code to see whether the pair bundles and whether a modifier can separate the services.

Medicare coverage policies for A4483

No current LCD or billing and coding article lists A4483. The HCPCS coverage code D means special coverage instructions apply, and any National Coverage Determination for the service still applies.

Denials to expect on A4483

CARC 50 · N115

the service is not reasonable and necessary for the diagnosis on the claim

CARC 151 · N362

units of A4483 exceed the DME supplier MUE of 30 per date of service

CARC 4

the modifier reported is inconsistent with the code

CARC 16

the claim lacks information needed to adjudicate the line, such as an order, NPI or required modifier

Where QuickIntell fits for A4483 claims

QuickAuth coordinates the requirement checks and documentation that DME claims for A4483 depend on, with human review of each case, and QuickRCM carries claim readiness and the CARC 50, 151 and modifier denials these items draw.

See QuickAuth for requirement checksSee QuickRCM for denial follow-upBook a meeting

Frequently asked questions: HCPCS A4483

What does HCPCS code A4483 describe?

"Moisture exchanger, disposable, for use with invasive mechanical ventilation" (short descriptor "Moisture exchanger"), in the A section (transportation, medical and surgical supplies, administrative, miscellaneous and investigational). Added 1999-01-01; last action N (no maintenance) effective 2003-01-01.

Is A4483 a CPT code?

No: CMS maintains A4483 in HCPCS Level II, while the AMA maintains CPT. It goes in the same procedure-code field.

What does Medicare pay for A4483?

The October 2026 DMEPOS fee schedule lists A4483 in category OS (ostomy, tracheostomy and urological items) without a ceiling, floor or state fee; its HCPCS pricing indicator is 37 (DMEPOS ostomy, tracheostomy and urological supplies (floors and ceilings)).

How many units of A4483 can be billed per day?

MUE limits for A4483: practitioner 0 (MAI 3, CMS Policy); hospital outpatient 1 (MAI 3, Clinical: CMS Workgroup); DME supplier 30 (MAI 3, Clinical: Data). For the DME supplier MUE (MAI 3), units above 30 deny for the day but can be paid on appeal with documentation; denials arrive as CARC 151.

Does Medicare cover A4483?

No current LCD or billing article lists A4483; its HCPCS coverage code is D (special coverage instructions apply).

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.

Disclaimer

This page is an operational reference compiled from CMS publications: the HCPCS Level II file, the physician, DMEPOS and clinical laboratory fee schedules, OPPS and ASC addenda, NCCI MUE, PTP and add-on edit tables and the Medicare Coverage Database. Amounts are Medicare national figures before locality and state adjustment; Medicaid and commercial payers set their own. CPT codes are shown as numbers only; CPT descriptors are copyright AMA. Nothing here is 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.