C4A.12 - Merkel cell carcinoma of left eyelid, including canthus

Version 2023
ICD-10:C4A.12
Short Description:Merkel cell carcinoma of left eyelid, including canthus
Long Description:Merkel cell carcinoma of left eyelid, including canthus
Status: Not Valid for Submission
Version:ICD-10-CM 2023
Code Classification:
  • Neoplasms (C00–D48)
    • Melanoma and other malignant neoplasms of skin (C43-C44)
      • Merkel cell carcinoma (C4A)

C4A.12 is a non-specific and non-billable ICD-10 code code, consider using a code with a higher level of specificity for a diagnosis of merkel cell carcinoma of left eyelid, including canthus. The code is not specific and is NOT valid for the year 2023 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding for Merkel cell carcinoma of left eyelid, including canthus

Non-specific codes like C4A.12 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for merkel cell carcinoma of left eyelid, including canthus:

  • BILLABLE CODE - Use C4A.121 for Merkel cell carcinoma of left upper eyelid, including canthus
  • BILLABLE CODE - Use C4A.122 for Merkel cell carcinoma of left lower eyelid, including canthus

Convert to ICD-9 Code

Source ICD-10 CodeTarget ICD-9 Code
C4A.12209.31 - Merkel cell ca-face
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education


Skin Cancer

Skin cancer is the most common form of cancer in the United States. The two most common types are basal cell cancer and squamous cell cancer. They usually form on the head, face, neck, hands, and arms. Another type of skin cancer, melanoma, is more dangerous but less common.

Anyone can get skin cancer, but it is more common in people who :

You should have your doctor check any suspicious skin markings and any changes in the way your skin looks. Treatment is more likely to work well when cancer is found early. If not treated, some types of skin cancer cells can spread to other tissues and organs. Treatments include surgery, radiation therapy, chemotherapy, photodynamic therapy (PDT), and biologic therapy. PDT uses a drug and a type of laser light to kill cancer cells. Biologic therapy boosts your body's own ability to fight cancer.

NIH: National Cancer Institute


[Learn More in MedlinePlus]

Code History