K66.1 – Hemoperitoneum

ICD-10-CM 2027 diagnosis code · Diseases of peritoneum, retroperitoneum and pelvis

Billable code

ICD-10-CM code K66.1

Code: K66.1 (claims format: K661)
Description: Hemoperitoneum
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 11. Diseases of the digestive system (K00-K95)
Block: K65-K6A Diseases of peritoneum, retroperitoneum and pelvis
Parent codes: K66

Notes for K66.1

Applicable to:

Peritoneal hematoma
Peritoneal hemorrhage

Excludes1 (not coded here):

traumatic hemoperitoneum (S36.8-)

Excludes2 (not included here):

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

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

K66 – Other disorders of peritoneum

Excludes2 (not included here):

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

Index terms for K66.1

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in K66

Frequently asked questions

What is ICD-10 code K66.1?

K66.1 is the ICD-10-CM code for hemoperitoneum, in the block K65-K6A (Diseases of peritoneum, retroperitoneum and pelvis).

Is K66.1 a billable code?

Yes. K66.1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K66.1 belong to?

It belongs to category K66 – Other disorders of peritoneum.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.