2021 ICD-10-CM Code C4A.122

Merkel cell carcinoma of left lower eyelid, including canthus

Version 2021
Billable Code
MS-DRG Mapping

Valid for Submission

C4A.122 is a billable diagnosis code used to specify a medical diagnosis of merkel cell carcinoma of left lower eyelid, including canthus. The code C4A.122 is valid during the fiscal year 2021 from October 01, 2020 through September 30, 2021 for the submission of HIPAA-covered transactions.

ICD-10:C4A.122
Short Description:Merkel cell carcinoma of left lower eyelid, inc canthus
Long Description:Merkel cell carcinoma of left lower eyelid, including canthus

Code Classification

Replacement Code

C4A122 replaces the following previously assigned ICD-10 code(s):

Information for Patients


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]

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019