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2. ICD-10 Codes
3. Chapter - C00-D49
4. Section - C43-C44
5. Category - C4A
6. C4A.2

C4A.2 - Merkel cell carcinoma of ear and external auricular canal

• Applicable to Merkel cell carcinoma of ear and external auricular canal
• The 2025 edition of ICD10-CM C4A.2 became effective on October 1, 2024.
• This is the American ICD10-CM version of C4A.2 - other international versions of ICD10 C4A.2 may differ.
• C4A.2 is a Non-Billable / Non-Specific ICD10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• C4A.2 Code should not be used for billing or reimbursement purposes as there are multiple ICD-10 CM codes below it that contain a greater level of detail.

The following codes above C4A.2 contain annotation back-references that may be applicable to C4A.2:

• Chapter: C00-D49 - Neoplasms
• Section: C43-C44 - Melanoma and other malignant neoplasms of skin
• Category: C4A - Merkel cell carcinoma

Browse other similar CM codes:

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.