FY2027 ICD-10-CM reference
D04: Carcinoma in situ of skin
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Carcinoma in situ of skin. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
CMS-HCC V28
Not applicable to this nonbillable heading
CMS-HCC V24
Not applicable to this nonbillable heading
ESRD
Not applicable to this nonbillable heading
PACE
Not applicable to this nonbillable heading
RxHCC
Not applicable to this nonbillable heading
HHS-HCC
Not applicable to this nonbillable heading
More specific FY2027 codes
- D04.0: Carcinoma in situ of skin of lipBillable code
- D04.1: Carcinoma in situ of skin of eyelid, including canthusNonbillable heading
- D04.2: Carcinoma in situ of skin of ear and external auricular canalNonbillable heading
- D04.3: Carcinoma in situ of skin of other and unspecified parts of faceNonbillable heading
- D04.4: Carcinoma in situ of skin of scalp and neckBillable code
- D04.5: Carcinoma in situ of skin of trunkBillable code
- D04.6: Carcinoma in situ of skin of upper limb, including shoulderNonbillable heading
- D04.7: Carcinoma in situ of skin of lower limb, including hipNonbillable heading
- D04.8: Carcinoma in situ of skin of other sitesBillable code
- D04.9: Carcinoma in situ of skin, unspecifiedBillable code
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
Functional activity
Source: C00-D49 (chapter, inherited).
Instructional note
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.
Source: C00-D49 (chapter, inherited).
Instructional note
Morphology [Histology]
Source: C00-D49 (chapter, inherited).
Instructional note
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.
Source: C00-D49 (chapter, inherited).
Instructional note
Primary malignant neoplasms overlapping site boundaries
Source: C00-D49 (chapter, inherited).
Instructional note
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.
Source: C00-D49 (chapter, inherited).
Instructional note
Malignant neoplasm of ectopic tissue
Source: C00-D49 (chapter, inherited).
Instructional note
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).
Source: C00-D49 (chapter, inherited).
Includes
Bowen's disease
Source: D00-D09 (section, inherited).
Includes
erythroplasia
Source: D00-D09 (section, inherited).
Includes
grade III intraepithelial neoplasia
Source: D00-D09 (section, inherited).
Includes
Queyrat's erythroplasia
Source: D00-D09 (section, inherited).
Excludes1
erythroplasia of Queyrat (penis) NOS (D07.4)
Source: D04 (category, direct).
Excludes1
melanoma in situ (D03.-)
Source: D04 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does D04 mean in FY2027?
The official ICD-10-CM descriptor is Carcinoma in situ of skin. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is D04 billable in FY2027?
The FY2027 order file marks D04 as a nonbillable heading. Select a complete billable child code.
Does D04 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition