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ICD-10 C4A - Merkel cell carcinoma
Chapter 2 Section C43-C44

C4A

ICD-10 Not billable

Merkel cell carcinoma

From Chapter 2:
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • 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:
10
C4A.0
Merkel cell carcinoma of lip
Billable
10
C4A.1
Merkel cell carcinoma of eyelid, including canthus
10
C4A.2
Merkel cell carcinoma of ear and external auricular canal
10
C4A.3
Merkel cell carcinoma of other and unspecified parts of face
10
C4A.4
Merkel cell carcinoma of scalp and neck
Billable
10
C4A.5
Merkel cell carcinoma of trunk
10
C4A.6
Merkel cell carcinoma of upper limb, including shoulder
10
C4A.7
Merkel cell carcinoma of lower limb, including hip
10
C4A.8
Merkel cell carcinoma of overlapping sites
Billable
10
C4A.9
Merkel cell carcinoma, unspecified
Billable
      
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