K66.1 Hemoperitoneum

The ICD-10-CM code for Hemoperitoneum is K66.1 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

11: Diseases of the digestive system (K00-K95)

Section

K65-K68: Diseases of peritoneum and retroperitoneum (K65-K68)

Category K66

5 codes (4 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K66.1:

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

Inclusion Terms

• Peritoneal hematoma
• Peritoneal hemorrhage

U.S. Hospital Utilization

• An estimated 59,265 U.S. inpatient stays in 2023 included K66.1 among the documented diagnoses.
• 4,460 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference K66.1 with the canonical source and edition:

K66.1 — Hemoperitoneum. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/K66.1

Canonical URL: https://icd10codingpro.com/codes/K66.1