Other disorders of peritoneum (K66) ICD-10-CM
The K66 code range covers other disorders of peritoneum with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the K66 Range 5 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the K66 range.
Hemoperitoneum
Accumulations of blood in the PERITONEAL CAVITY due to internal HEMORRHAGE.
About the K66 Code Range
Adhesions and hemoperitoneum appear here alongside other disorders of the peritoneum. The category sits within digestive system diseases, in a block that also includes retroperitoneal diseases.
K66.0 identifies peritoneal adhesions, including those following a procedure or infection. K66.1 identifies hemoperitoneum. K66.8 identifies other specified peritoneal disorders, while K66.9 is for an unspecified peritoneal disorder.
Questions About This Page
How many billable codes are in the K66 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the K66 range classify?
The range classifies other disorders of peritoneum. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
