ICD-10-CM 2027
ICD-10 code for Hemoperitoneum
From the official ICD-10-CM alphabetic index entry “Hemoperitoneum”. Page updated September 29, 2026.
About coding Hemoperitoneum
The ICD-10-CM code for Hemoperitoneum is K66.1 (Hemoperitoneum). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K66.1.
Within K66 (other disorders of peritoneum), K66.1 is specifically for Hemoperitoneum. Related codes cover peritoneal adhesions (postprocedural) (postinfection) (K66.0), other specified disorders of peritoneum (K66.8) and disorder of peritoneum, unspecified (K66.9).
Don't report K66.1 together with the conditions in its Excludes1 note: traumatic hemoperitoneum (S36.8-).
The conditions in its Excludes2 note aren't part of K66.1, but may be coded alongside it if the patient has both: retroperitoneal hematoma (K68.3) and retroperitoneal hemorrhage (K68.3).
More specific Hemoperitoneum codes (official index)
Don't confuse with (Excludes1 for K66.1)
- traumatic hemoperitoneum (S36.8-)
Common questions about Hemoperitoneum ICD-10 codes
What is the ICD-10 code for Hemoperitoneum?
- K66.1 — Hemoperitoneum. More specific codes apply when the documentation supports them: K65.9, S36.899.
What is the ICD-10 code for infectional hemoperitoneum?
- K65.9 — Peritonitis, unspecified.
What is the ICD-10 code for traumatic hemoperitoneum?
- S36.899 — Unspecified injury of other intra-abdominal organs (header code; choose a more specific subcode).
Is K66.1 billable?
- Yes. K66.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K66.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K66.1 as a principal diagnosis.
Is K66.1 a CC or MCC?
- K66.1 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.