Diseases of peritoneum and retroperitoneum
22 codes in this section
About Section K65-K68
Section K65-K68 (K65-K68) covers diseases of peritoneum and retroperitoneum. It sits within the Diseases of the digestive system chapter (K00-K95). This section contains 22 ICD-10-CM codes, 18 billable diagnoses you can submit on a claim, and 4 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in K65-K68
Grouped by 3-character root code. Click any code for full detail.
| K65.0 | Generalized (acute) peritonitis | Billable |
| K65.1 | Peritoneal abscess | Billable |
| K65.2 | Spontaneous bacterial peritonitis | Billable |
| K65.3 | Choleperitonitis | Billable |
| K65.4 | Sclerosing mesenteritis | Billable |
| K65.8 | Other peritonitis | Billable |
| K65.9 | Peritonitis, unspecified | Billable |
| K66.0 | Peritoneal adhesions (postprocedural) (postinfection) | Billable |
| K66.1 | Hemoperitoneum | Billable |
| K66.8 | Other specified disorders of peritoneum | Billable |
| K66.9 | Disorder of peritoneum, unspecified | Billable |
| K68.1 | Retroperitoneal abscess | Header |
| K68.11 | Postprocedural retroperitoneal abscess | Billable |
| K68.12 | Psoas muscle abscess | Billable |
| K68.19 | Other retroperitoneal abscess | Billable |
| K68.2 | Retroperitoneal fibrosis | Billable |
| K68.3 | Retroperitoneal hematoma | Billable |
| K68.9 | Other disorders of retroperitoneum | Billable |
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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