Billable / Specific Code
ICD-10-CM C4A.112 is the diagnosis code for Merkel cell carcinoma of right lower eyelid, including canthus. This code falls under the section "Melanoma and other malignant neoplasms of skin" within Chapter 2 — Neoplasms (C00-D49). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where C4A.112 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, C4A.112 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
C4A.112 is the ICD-10-CM diagnosis code for "Merkel cell carcinoma of right lower eyelid, including canthus". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of C4A.112 is C4A.11 ("Merkel cell carcinoma of right eyelid, including canthus"). C4A.112 provides a more specific classification within this category.
C4A.112 is located in Section C43-C44 — "Melanoma and other malignant neoplasms of skin" within Chapter 2 of the ICD-10-CM Tabular List.
Use C4A.112 when the patients documented diagnosis matches "Merkel cell carcinoma of right lower eyelid, including canthus" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Merkel cell carcinoma of right lower eyelid, including canthus is C4A.112.
Yes, C4A.112 can be used as a primary diagnosis code since it is billable and specific.
C4A.112 is in Chapter 2 of the ICD-10-CM Tabular List.
Yes, C4A.112 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.