ICD-10 · PDGM grouping
K35-K38 — Diseases of appendix
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.2.26.
Codes in range
21
No clinical group
1
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
17 of the 21 codes in K35-K38 group to MMTA - Gastrointestinal tract and Genitourinary system, but the range is not uniform — it spreads across 2 clinical groups. A further 1 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Code families in K35-K38
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
Every code in K35-K38
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| K35200 | Acute appendicitis with gen peritonitis, w/o perf or abscs | J | Can lead a claim |
| K35201 | Ac appendicitis with gen peritonitis, with perf, w/o abscs | J | Can lead a claim |
| K35209 | Ac appendicitis w gen peritonitis,w/o abscs,unsp as to perf | J | Can lead a claim |
| K35210 | Ac appendicitis with gen peritonitis, w/o perf, with abscs | J | Can lead a claim |
| K35211 | Acute appendicitis with gen peritonitis, with perf and abscs | J | Can lead a claim |
| K35219 | Ac appendicitis w gen peritonitis, w abscs, unsp as to perf | J | Can lead a claim |
| K3530 | Acute appendicitis with loc peritonitis, w/o perf or gangr | J | Can lead a claim |
| K3531 | Acute appendicitis with loc peritonitis and gangr, w/o perf | J | Can lead a claim |
| K3532 | Ac appendicitis w perf, loc peritonitis, & gangr, w/o abscs | J | Can lead a claim |
| K3533 | Ac appendicitis with perf, loc peritonitis, and gangr, wbscs | J | Can lead a claim |
| K3580 | Unspecified acute appendicitis | J | Can lead a claim |
| K35890 | Other acute appendicitis without perforation or gangrene | J | Can lead a claim |
| K35891 | Other acute appendicitis without perforation, with gangrene | J | Can lead a claim |
| K36 | Other appendicitis | J | Can lead a claim |
| K37 | Unspecified appendicitis | J | Can lead a claim |
| K380 | Hyperplasia of appendix | J | Can lead a claim |
| K381 | Appendicular concretions | A | Can lead a claim |
| K382 | Diverticulum of appendix | A | Can lead a claim |
| K383 | Fistula of appendix | A | Can lead a claim |
| K388 | Other specified diseases of appendix | J | Can lead a claim |
| K389 | Disease of appendix, unspecified | None | Cannot lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. 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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