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

Non-billable header with 3 child codes.

Codes under C4A.2

• C4A.20 Merkel cell carcinoma of unspecified ear and external auricular canal
• C4A.21 Merkel cell carcinoma of right ear and external auricular canal
• C4A.22 Merkel cell carcinoma of left ear and external auricular canal

Code annotations containing back-references to C4A.2

Back-references to C4A

• Type 2 Excludes: C43 Malignant melanoma of skin ("Merkel cell carcinoma (C4A.-)")
• Type 1 Excludes: C44 Other and unspecified malignant neoplasm of skin ("Merkel cell carcinoma (C4A.-)")
• Type 2 Excludes: C7A Malignant neuroendocrine tumors ("Merkel cell carcinoma (C4A.-)")

Diagnosis Index entries for C4A.2

• Carcinoma (malignant) › Merkel cell › ear and external auricular canal
• Carcinoma (malignant) › Merkel cell › external auricular canal

Nearby codes

• C4A.111 Merkel cell carcinoma of right upper eyelid, including canthus
• C4A.112 Merkel cell carcinoma of right lower eyelid, including canthus
• C4A.12 Merkel cell carcinoma of left eyelid, including canthus
• C4A.121 Merkel cell carcinoma of left upper eyelid, including canthus
• C4A.122 Merkel cell carcinoma of left lower eyelid, including canthus
• C4A.2 Merkel cell carcinoma of ear and external auricular canal (this code)
• C4A.20 Merkel cell carcinoma of unspecified ear and external auricular canal
• C4A.21 Merkel cell carcinoma of right ear and external auricular canal
• C4A.22 Merkel cell carcinoma of left ear and external auricular canal
• C4A.3 Merkel cell carcinoma of other and unspecified parts of face
• C4A.30 Merkel cell carcinoma of unspecified part of face