ICD-10-CM › C00-D49 › C43-C44 › C4A Merkel cell carcinoma › C4A.2

C4A.2

Merkel cell carcinoma of ear and external auricular canal

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 3 more specific codes instead:

  • 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

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

  1. FY2012 Added to the draft code set draft Merkel cell carcinoma of ear and external auricular canal

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Codes in the same group

CodeDescriptionStatus
C4A.0 Merkel cell carcinoma of lip Valid
C4A.1 Merkel cell carcinoma of eyelid, including canthus Not billable
C4A.3 Merkel cell carcinoma of other and unspecified parts of face Not billable
C4A.4 Merkel cell carcinoma of scalp and neck Valid
C4A.5 Merkel cell carcinoma of trunk Not billable
C4A.6 Merkel cell carcinoma of upper limb, including shoulder Not billable
C4A.7 Merkel cell carcinoma of lower limb, including hip Not billable
C4A.8 Merkel cell carcinoma of overlapping sites Valid
C4A.9 Merkel cell carcinoma, unspecified Valid