ICD-10 · PDGM grouping
K59 Other functional intestinal disorders
All 14 codes in the K59 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
14
Can lead a claim
14
Cannot lead a claim
0
What CMS assigns to K59
All 14 codes group to MMTA - Gastrointestinal tract and Genitourinary system. 1 of the 14 counts toward the Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders comorbidity subgroup; 13 are assigned none. Every code can lead a claim. CMS attaches a code-first note to 2 of the 14.
- Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders
Code first
CMS grouper convention 8, on K59.31, K59.39. Code first:
- , if applicable, toxic effects of substances chiefly nonmedicinal as to source (T51-T65)
Every code in K59
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| K59.0 Constipation | ||||
| K59.00 | Constipation, unspecified | Can lead a claim | J | None |
| K59.01 | Slow transit constipation | Can lead a claim | J | None |
| K59.02 | Outlet dysfunction constipation | Can lead a claim | J | None |
| K59.03 | Drug induced constipation | Can lead a claim | J | None |
| K59.04 | Chronic idiopathic constipation | Can lead a claim | J | None |
| K59.09 | Other constipation | Can lead a claim | J | None |
| K59.1 | Functional diarrhea | Can lead a claim | J | None |
| K59.2 | Neurogenic bowel, not elsewhere classified | Can lead a claim | J | None |
| K59.3 Megacolon, not elsewhere classified | ||||
| K59.31 | Toxic megacolon | Can lead a claim, code first applies | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K59.39 | Other megacolon | Can lead a claim, code first applies | J | None |
| K59.4 | Anal spasm | Can lead a claim | J | None |
| K59.8 Other specified functional intestinal disorders | ||||
| K59.81 | Ogilvie syndrome | Can lead a claim | J | None |
| K59.89 | Other specified functional intestinal disorders | Can lead a claim | J | None |
| K59.9 | Functional intestinal disorder, unspecified | Can lead a claim | J | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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