C4A.20 Merkel cell carcinoma of unspecified ear and external auricular canal

The ICD-10-CM code for Merkel cell carcinoma of unspecified ear and external auricular canal is C4A.20 (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 C4A

33 codes (24 billable)

FY2026 Status

Stable since FY2024

U.S. Hospital Utilization

C4A.20 appeared in too few sampled U.S. inpatient stays in 2020 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient diagnosis.

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

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 C4A.20 with the canonical source and edition:

C4A.20 — Merkel cell carcinoma of unspecified ear and external auricular canal. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/C4A.20

Canonical URL: https://icd10codingpro.com/codes/C4A.20