K66.1 Hemoperitoneum

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• Peritoneal hematoma
• Peritoneal hemorrhage

Excludes1 (never code together)

• traumatic hemoperitoneum (S36.8-)

Excludes2 (not included here)

• retroperitoneal hematoma (K68.3)
• retroperitoneal hemorrhage (K68.3)

Applies from K66 Other disorders of peritoneum

Excludes2 (not included here)

• ascites (R18.-)
• peritoneal effusion (chronic) (R18.8)

MS-DRG index

Defines the logic of DRG(s) 393-395 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 568.81 Hemoperitoneum (nontraumatic)

Diagnosis Index entries for K66.1

• Hematoma (traumatic) (skin surface intact) › peritoneal
• Hemoperitoneum
• Hemorrhage, hemorrhagic (concealed) › intrapelvic › male
• Hemorrhage, hemorrhagic (concealed) › intraperitoneal
• Hemorrhage, hemorrhagic (concealed) › mesentery
• Hemorrhage, hemorrhagic (concealed) › omentum
• Hemorrhage, hemorrhagic (concealed) › peritoneum, peritoneal

Nearby codes

• K66 Other disorders of peritoneum
• K66.0 Peritoneal adhesions (postprocedural) (postinfection)
• K66.1 Hemoperitoneum (this code)
• K66.8 Other specified disorders of peritoneum
• K66.9 Disorder of peritoneum, unspecified