ICD-10 · PDGM grouping
K31 Other diseases of stomach and duodenum
All 26 codes in the K31 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
26
Can lead a claim
25
Cannot lead a claim
1
What CMS assigns to K31
25 of the 26 codes group to MMTA - Gastrointestinal tract and Genitourinary system (23) and MMTA - Other (2); 1 is assigned no clinical group. None of the 26 is assigned a comorbidity subgroup. 25 of the 26 can lead a claim. CMS attaches a code-first note to 1 of the 26.
Code first
CMS grouper convention 100, on K31.84. Code first:
- anorexia nervosa (F50.0-)
- diabetes mellitus (E08.43, E09.43, E10.43, E11.43, E13.43)
- scleroderma (M34.-)
- underlying disease, if known, such as:
Every code in K31
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 |
|---|---|---|---|---|
| K31.0 | Acute dilatation of stomach | Can lead a claim | A | None |
| K31.1 | Adult hypertrophic pyloric stenosis | Can lead a claim | J | None |
| K31.B | Hypertrophic pyloric stenosis, in childhood | Can lead a claim | J | None |
| K31.2 | Hourglass stricture and stenosis of stomach | Can lead a claim | J | None |
| K31.3 | Pylorospasm, not elsewhere classified | Can lead a claim | J | None |
| K31.4 | Gastric diverticulum | Can lead a claim | J | None |
| K31.5 | Obstruction of duodenum | Can lead a claim | J | None |
| K31.6 | Fistula of stomach and duodenum | Can lead a claim | J | None |
| K31.7 | Polyp of stomach and duodenum | Can lead a claim | J | None |
| K31.8 Other specified diseases of stomach and duodenum | ||||
| K31.81 Angiodysplasia of stomach and duodenum | ||||
| K31.811 | Angiodysplasia of stomach and duodenum with bleeding | Can lead a claim | J | None |
| K31.819 | Angiodysplasia of stomach and duodenum without bleeding | Can lead a claim | J | None |
| K31.82 | Dieulafoy lesion (hemorrhagic) of stomach and duodenum | Can lead a claim | J | None |
| K31.83 | Achlorhydria | Can lead a claim | A | None |
| K31.84 | Gastroparesis | Can lead a claim, code first applies | J | None |
| K31.89 | Other diseases of stomach and duodenum | Can lead a claim | J | None |
| K31.9 | Disease of stomach and duodenum, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| K31.A Gastric intestinal metaplasia | ||||
| K31.A0 | Gastric intestinal metaplasia, unspecified | Can lead a claim | J | None |
| K31.A1 Gastric intestinal metaplasia without dysplasia | ||||
| K31.A11 | Gastric intestinal metaplasia without dysplasia, involving the antrumCMS: Gastric intestnl metaplasia without dysplasia, w the antrum | Can lead a claim | J | None |
| K31.A12 | Gastric intestinal metaplasia without dysplasia, involving the body (corpus)CMS: Gastr intestnl metaplasia w/o dysplasia, w the body (corpus) | Can lead a claim | J | None |
| K31.A13 | Gastric intestinal metaplasia without dysplasia, involving the fundusCMS: Gastric intestnl metaplasia without dysplasia, w the fundus | Can lead a claim | J | None |
| K31.A14 | Gastric intestinal metaplasia without dysplasia, involving the cardiaCMS: Gastric intestnl metaplasia without dysplasia, w the cardia | Can lead a claim | J | None |
| K31.A15 | Gastric intestinal metaplasia without dysplasia, involving multiple sitesCMS: Gastric intestnl metaplasia without dysplasia, w mult sites | Can lead a claim | J | None |
| K31.A19 | Gastric intestinal metaplasia without dysplasia, unspecified siteCMS: Gastric intestinal metaplasia without dysplasia, unsp site | Can lead a claim | J | None |
| K31.A2 Gastric intestinal metaplasia with dysplasia | ||||
| K31.A21 | Gastric intestinal metaplasia with low grade dysplasia | Can lead a claim | J | None |
| K31.A22 | Gastric intestinal metaplasia with high grade dysplasia | Can lead a claim | J | None |
| K31.A29 | Gastric intestinal metaplasia with dysplasia, 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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