C44.500 Unspecified malignant neoplasm of anal skin

The ICD-10-CM code for Unspecified malignant neoplasm of anal skin is C44.500 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

C43-C44: Melanoma and other malignant neoplasms of skin (C43-C44)

Category C44

147 codes (101 billable)

FY2026 Status

Stable since FY2024

Inclusion Terms

• Unspecified malignant neoplasm of anal margin
• Unspecified malignant neoplasm of perianal skin

U.S. Hospital Utilization

• An estimated 55 U.S. inpatient stays in 2021 included C44.500 among the documented diagnoses.

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 C44.500 with the canonical source and edition:

C44.500 — Unspecified malignant neoplasm of anal skin. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/C44.500

Canonical URL: https://icd10codingpro.com/codes/C44.500