C48.1 Malignant neoplasm of specified parts of peritoneum

The ICD-10-CM code for Malignant neoplasm of specified parts of peritoneum is C48.1 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

C45-C49: Malignant neoplasms of mesothelial and soft tissue (C45-C49)

Category C48

5 codes (4 billable)

FY2026 Status

Stable since FY2024

Inclusion Terms

• Malignant neoplasm of cul-de-sac
• Malignant neoplasm of mesentery
• Malignant neoplasm of mesocolon
• Malignant neoplasm of omentum
• Malignant neoplasm of parietal peritoneum
• Malignant neoplasm of pelvic peritoneum

U.S. Hospital Utilization

• An estimated 1,605 U.S. inpatient stays in 2023 included C48.1 among the documented diagnoses.
• 645 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

Tx of primary site (TOC entry)

a. Admission/Encounter for treatment of primary site ............................................................. 33

Tx of secondary site (TOC entry)

b. Admission/Encounter for treatment of secondary site .......................................................... 33

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 C48.1 with the canonical source and edition:

C48.1 — Malignant neoplasm of specified parts of peritoneum. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/C48.1

Canonical URL: https://icd10codingpro.com/codes/C48.1