A rare type of cancer that forms on or just beneath the skin, usually in parts of the body that have been exposed to the sun. It is most common in older people and in people with weakened immune systems. ICD-10-CM C4A.9 is grouped within Diagnostic Related Group (s) (MS-DRG v42.0): 595 Major skin disorders with mcc 596 Major skin disorders ...

A carcinoma arising from merkel cells located in the basal layer of the epidermis and occurring most commonly as a primary neuroendocrine carcinoma of the skin. Merkel cells are tactile cells of neuroectodermal origin and histologically show neurosecretory granules.

C4A.9 is a billable diagnosis code used to specify a medical diagnosis of merkel cell carcinoma, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2024 through September 30, 2025.

Get crucial instructions for accurate ICD-10-CM C4A coding with all applicable Excludes 1 and Excludes 2 notes from the section level conveniently shown with each code.

Browse all the diagnosis codes used for merkel cell carcinoma (c4a). For easy navigation, the diagnosis codes are sorted in alphabetical order and grouped by sections. Each section is …

Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9). C4A is a "category code," which means it's non-billable. Billable codes require more specificity. Use the list below to navigate to codes that are more specific:

ICD 10 code for Merkel cell carcinoma. Get free rules, notes, crosswalks, synonyms, history for ICD-10 code C4A.

Get crucial instructions for accurate ICD-10-CM C4A.9 coding with all applicable Excludes 1 and Excludes 2 notes from the section level conveniently shown with each code. This section shows you chapter-specific coding guidelines to increase your understanding and correct usage of the target ICD-10-CM Volume 1 code.

C4A is a non-billable ICD-10 code for Merkel cell carcinoma. It should not be used for HIPAA-covered transactions as a more specific code is available to choose from below. ↓ See below for any exclusions, inclusions or special notations

2025 ICD-10-CM diagnosis code C4A for merkel cell carcinoma. View code's billable status, notations, version history, related codes, and more.