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ICD-10-CM K51.914: Ulcerative colitis, unspecified with abscess

K51.914 is the billable ICD-10-CM code for ulcerative colitis, unspecified with abscess, in category K51 (Ulcerative colitis) of the Noninfective enteritis and colitis section. As a principal diagnosis it groups to MS-DRG 385 Inflammatory Bowel Disease with MCC, MS-DRG 386 Inflammatory Bowel Disease with CC, MS-DRG 387 Inflammatory Bowel Disease without CC/MCC (MDC 06 MDC 06: Diseases and Disorders of the Digestive System). It maps to HCC 81 (Ulcerative Colitis) in CMS-HCC V28. As a secondary diagnosis it is a CC, excluded with 49 principal diagnoses. 20 LCD billing and coding articles list it as covered.

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

Data currency: ICD-10-CM code descriptions: FY2027 (effective October 1, 2026); IPPS Table 5 (MS-DRG weights): v44 FY2027 (final rule + CN3) (effective October 1, 2026); ICD-10-CM to HCC mapping: PY2027 initial ICD-10-CM mappings (dates of service 2026) (payment year 2027); Medicare Coverage Database billing and coding articles: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: FY2028 code files, effective October 1, 2027 for the ICD-10-CM code descriptions; FY2028 final rule (August 2027), effective October 1, 2027; an April 1 interim grouper update when CMS issues one for the IPPS Table 5 (MS-DRG weights); PY2028 advance notice (February 2027) and the PY2027 midyear final mapping (spring 2027) for the ICD-10-CM to HCC mapping; weekly, every Thursday for the Medicare Coverage Database billing and coding articles.

Code
K51.914
billable FY2027 ICD-10-CM code
Category
K51 Ulcerative colitis
Chapter
11: Diseases of the digestive system (K00-K95)
CC/MCC (MS-DRG v44)
CC
CMS-HCC V28
HCC 81
POA reporting
Required

Tabular list notes for K51.914

The tabular list has no notes on K51.914 itself; the notes below apply from its parent headings.

Inherited from K51 (Ulcerative colitis)

Excludes1 (never coded together)
  • Crohn's disease [regional enteritis] (K50.-)
Use additional code
  • code to identify any associated fistulas, if applicable:
  • anal fistula (K60.3-)
  • anorectal fistula (K60.5-)
  • rectal fistula (K60.4-)
  • code to identify manifestations, such as:
  • pyoderma gangrenosum (L88)

MS-DRG grouping when K51.914 is the principal diagnosis

MS-DRG v44 groups for K51.914 as principal diagnosis
MDCMS-DRGs
06 MDC 06: Diseases and Disorders of the Digestive System385386387

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for K51.914 shows the full grouping logic.

CC/MCC status and inpatient edits

As a secondary diagnosis, K51.914 is a CC under MS-DRG v44, unless the principal diagnosis is one of the 49 codes in its exclusion list. Check K51.914 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.

CMS-HCC V28 risk adjustment

In the PY2027 mapping, K51.914 maps to HCC 81 (Ulcerative Colitis). The HCC lookup shows the RAF weight and the hierarchy.

LCD billing and coding articles that list K51.914

20 current Medicare billing and coding articles list K51.914 among the diagnoses that support medical necessity for the services they cover.

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Frequently asked questions

What does ICD-10-CM K51.914 mean?

K51.914 means ulcerative colitis, unspecified with abscess. It is one of 25 billable codes under K51, ulcerative colitis.

Which MS-DRG does K51.914 group to?

As the principal diagnosis, K51.914 groups to MS-DRG 385 Inflammatory Bowel Disease with MCC, MS-DRG 386 Inflammatory Bowel Disease with CC, MS-DRG 387 Inflammatory Bowel Disease without CC/MCC (MDC 06 MDC 06: Diseases and Disorders of the Digestive System) under MS-DRG v44, before procedures and secondary diagnoses are applied.

Does K51.914 map to an HCC?

Yes: HCC 81, Ulcerative Colitis, in the PY2027 CMS-HCC V28 mapping.

Is K51.914 a CC or MCC?

K51.914 is a CC under MS-DRG v44; 49 principal diagnoses exclude it.

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

The descriptor and notes are reproduced from the FY2027 ICD-10-CM files; MS-DRG, CC/MCC and HCC facts come from the CMS FY2027 and PY2027 tables. Code from the medical record and the ICD-10-CM Official Guidelines. 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.