CC and MCC list FY2027 (MS-DRG v44), with the CC exclusion lookup

The FY2027 lists in numbers

MCC codes (Table 6I)

3,357

283 ICD-10-CM categories

CC codes (Table 6J)

15,113

691 ICD-10-CM categories

Change from v43.1

+38 codes

18,432 CC/MCC codes before October 1, 2026

PDX exclusion collections (Table 6K)

1,994

181,060 principal-diagnosis entries; median 36 per collection

CC/MCC codes with no exclusions

31

They count with any principal diagnosis

MCC only if discharged alive

8

Table 6K part 2

Codes on the HAC list

3,996

Definitions Manual Appendix I

The MCC list is the shorter and heavier one: an MCC usually lifts a three-way family (with MCC, with CC, without CC/MCC) to its top weight, while a CC lifts it one step. Injury codes dominate both lists: chapter 19 of ICD-10-CM (S00-T88) supplies 2,125 MCCs and 8,799 CCs, because fracture, intracranial injury and burn codes repeat for every site, laterality and encounter character. 5,664 CC/MCC codes are also on the POA-exempt list, so the hospital-acquired condition logic can never apply to them.

What changed for FY2027

The v43.1 lists in force until September 30, 2026 held 3,354 MCCs and 15,078 CCs. For FY2027 CMS added 3 MCCs (Table 6I.1) and 56 CCs (Table 6J.1), all of them codes that are new to ICD-10-CM on October 1, 2026, and removed 21 CCs (Table 6J.2). Comparing the v43.1 and v44 Definitions Manuals code by code confirms that no code moved between the CC and MCC levels and that no MCC left the list. The FY2027 ICD-10 code-change report lists every new code with its MDC and MS-DRGs.

The exclusion lists changed more than the CC/MCC lists did. Table 6G.1 adds 14,334 principal-and-secondary exclusion pairs across 1,230 CC/MCC codes (Table 6G.2 shows the same pairs ordered by the 597 principal diagnoses involved), and Table 6H.1 deletes 3,206 pairs across 306 codes. An encoder or edit table still on the v43.1 exclusions can therefore count a CC or MCC that v44 cancels, or the reverse, even when the code itself did not change level.

How the CC exclusion works

Table 6K gives every CC and MCC a principal-diagnosis (PDX) collection number. If the stay's principal diagnosis is one of the codes in that collection, the secondary diagnosis does not count toward severity for that stay. 18,168 of the 18,470 codes are excluded when they are themselves the principal diagnosis, and 1,994 distinct collections cover the list; the median collection holds 36 codes and the largest holds 5,561. That largest collection (1220) is shared by 5,561 CC/MCC codes such as M80.00XK, age-related osteoporosis with current pathological fracture, unspecified site, subsequent encounter for fracture with nonunion.

MCCs that count only when the patient is discharged alive

CC/MCC exclusions inside selected MS-DRGs

Table 6K part 3 names 11 MS-DRG families whose own definition uses certain CC or MCC codes. When one of those codes is a secondary diagnosis on a stay that groups to the family, it is not counted again for severity: a traumatic coma code cannot both define DRGs 082-084 and push the stay to the with-MCC member.

CCs and MCCs by ICD-10-CM chapter

Hospital-acquired conditions and POA on the CC/MCC list

3,996 CC and MCC codes belong to one of the 14 hospital-acquired condition categories. When such a code is reported as a secondary diagnosis with a present-on-admission indicator of N or U and the category's criteria are met, the MS-DRG v44 grouper does not let it raise the severity level; indicators Y and W keep it. The FY2027 HAC list by category shows the codes and procedures behind each category, and the POA-exempt list summary shows which codes need no indicator at all.

Download the full list

The FY2027 CC/MCC list as CSV has one row per code (18,470 rows): ICD-10-CM code and description, CC or MCC, the Table 6K exclusion collection and its size, HAC categories, the POA-exempt flag and the discharged-alive condition. It is computed from the CMS files cited below; the CMS tables themselves are on the FY2027 IPPS final rule page.

Related MS-DRG reference

• MS-DRG lookup and FY2027 weightsFind the MDC and MS-DRGs for a diagnosis or procedure code.
• Medicare Code Editor v44 editsAge, manifestation, unacceptable principal diagnosis and coverage edits.
• New and deleted ICD-10 codes for FY2027Every code change with its CC/MCC level and MS-DRGs.
• CMS-HCC V28 categoriesThe risk-adjustment model many of the same diagnoses feed.

Frequently asked questions

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.

• IPPS FY2027 Tables 6A-6K: new, invalid and revised ICD-10-CM/PCS codes, CC/MCC list changes and CC exclusions
  Version FY2027 (final rule; not reissued by CN3) · effective 2026-10-01 · file fy2027-ipps-fr-tables-6a-6k.zipSHA-256 ca0af87b0869a405…
• ICD-10 MS-DRG Definitions Manual v44 (text)
  Version v44 · effective 2026-10-01 · file fy2027-fr-icd10-ms-drg-definitions-manual-files-v44.zipSHA-256 ae4f6c11727fe91f…
• ICD-10 MS-DRG Definitions Manual v43.1 (text), the last grouper before v44
  Version v43.1 · effective 2026-04-01 · file icd10-ms-drg-definitions-manual-files-v43-1.zipSHA-256 f4d610e8d211cd52…
• ICD-10-CM FY2027 POA-exempt codes (full list, additions, deletions and revisions)
  Version FY2027 · effective 2026-10-01 · file 2027-poa-exempt-codes.zipSHA-256 03f55091045024d0…
• ICD-10-CM FY2027 code descriptions
  Version FY2027 · effective 2026-10-01 · file icd10cm_codes_2027.txtSHA-256 3c0583a38ee0e848…