K65-K68 — Diseases of peritoneum and retroperitoneum
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.1.26.
Codes in range
18
No clinical group
2
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
16 of the 18 codes in K65-K68 group to MMTA - Gastrointestinal tract and Genitourinary system. A further 2 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Every code in K65-K68
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| K650 | Generalized (acute) peritonitis | J | Accepted |
| K651 | Peritoneal abscess | J | Accepted |
| K652 | Spontaneous bacterial peritonitis | J | Accepted |
| K653 | Choleperitonitis | J | Accepted |
| K654 | Sclerosing mesenteritis | J | Accepted |
| K658 | Other peritonitis | J | Accepted |
| K659 | Peritonitis, unspecified | J | Accepted |
| K660 | Peritoneal adhesions (postprocedural) (postinfection) | J | Accepted |
| K661 | Hemoperitoneum | J | Accepted |
| K668 | Other specified disorders of peritoneum | J | Accepted |
| K669 | Disorder of peritoneum, unspecified | None | Cannot group |
| K67 | Disorders of peritoneum in infectious diseases classd elswhr | None | Cannot group |
| K6811 | Postprocedural retroperitoneal abscess | J | Accepted |
| K6812 | Psoas muscle abscess | J | Accepted |
| K6819 | Other retroperitoneal abscess | J | Accepted |
| K682 | Retroperitoneal fibrosis | J | Accepted |
| K683 | Retroperitoneal hematoma | J | Accepted |
| K689 | Other disorders of retroperitoneum | J | Accepted |
Source: CMS HH PPS Grouper Software v07.1.26, effective 2026-04-01. 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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