Alphabetic Index FY2027

D04

Carcinoma in situ of skin

FY2027Chapter 2: Neoplasms/D00–D09 In situ neoplasms

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

D04 is a non-billable ICD-10-CM code category for carcinoma in situ of skin. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are D04.0 Carcinoma in situ of skin of lip; D04.1 Carcinoma in situ of skin of eyelid, including canthus; D04.2 Carcinoma in situ of skin of ear and external auricular canal; D04.3 Carcinoma in situ of skin of other and unspecified parts of face and 6 more. Its coding notes include 2 Excludes1 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code
  • erythroplasia of Queyrat (penis) NOS (D07.4)
  • melanoma in situ (D03.-)

Includes

Further defines or gives examples of the content of the category.

Also from chapter/block level (4 notes)
Inherited from D00–D09 In situ neoplasms
  • Bowen's disease
  • erythroplasia
  • grade III intraepithelial neoplasia
  • Queyrat's erythroplasia

Notes

Also from chapter/block level (8 notes)
Inherited from Chapter 2 Neoplasms
  • 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).

More specific codes under D04 10