C4A.2 – Merkel cell carcinoma of ear and external auricular canal
ICD-10-CM 2027 diagnosis code · Melanoma and other malignant neoplasms of skin
ICD-10-CM code
C4A.2
- Code
C4A.2(claims format:C4A2)- Description
- Merkel cell carcinoma of ear and external auricular canal
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 2. Neoplasms (C00-D49)
- Block
- C43-C44 Melanoma and other malignant neoplasms of skin
- Parent codes
- C4A
Billable codes under C4A.2
C4A.2 is a header code and cannot be used on claims. Choose the most specific code:
Index terms for C4A.2
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in C4A
- C4A.0 – Merkel cell carcinoma of lipBillable
- C4A.1 – Merkel cell carcinoma of eyelid, including canthusHeader
- C4A.3 – Merkel cell carcinoma of other and unspecified parts of faceHeader
- C4A.4 – Merkel cell carcinoma of scalp and neckBillable
- C4A.5 – Merkel cell carcinoma of trunkHeader
- C4A.6 – Merkel cell carcinoma of upper limb, including shoulderHeader
- C4A.7 – Merkel cell carcinoma of lower limb, including hipHeader
- C4A.8 – Merkel cell carcinoma of overlapping sitesBillable
- C4A.9 – Merkel cell carcinoma, unspecifiedBillable
Frequently asked questions
What is ICD-10 code C4A.2?
C4A.2 is the ICD-10-CM code for merkel cell carcinoma of ear and external auricular canal, in the block C43-C44 (Melanoma and other malignant neoplasms of skin).
Is C4A.2 a billable code?
No. C4A.2 is a header code with more specific child codes; report one of the billable codes listed above.
What category does C4A.2 belong to?
It belongs to category C4A – Merkel cell carcinoma.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.