ICD10BillableValid for clinical use
ICD-10 Code D04.9: Carcinoma in situ of skin, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Neoplasms (C00-D49).
When is it used?
- May be used when a clinician documents carcinoma in situ of skin, unspecified in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
2Neoplasms (C00-D49)
block
D00-D09In situ neoplasms
category
D04Carcinoma in situ of skin
currentD04
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
OncologistGeneral PhysicianDermatologist
Related codes
D04.0Carcinoma in situ of skin of lipcodeD04.1Carcinoma in situ of skin of eyelid, including canthuscategoryD04.2Carcinoma in situ of skin of ear and external auricular canalcategoryD04.3Carcinoma in situ of skin of other and unspecified parts of facecategoryD04.4Carcinoma in situ of skin of scalp and neckcodeD04.5Carcinoma in situ of skin of trunkcodeD04.6Carcinoma in situ of skin of upper limb, including shouldercategoryD04.7Carcinoma in situ of skin of lower limb, including hipcategoryD04.8Carcinoma in situ of skin of other sitescode
Sibling codes
D04.0Carcinoma in situ of skin of lipbillableD04.1Carcinoma in situ of skin of eyelid, including canthusD04.2Carcinoma in situ of skin of ear and external auricular canalD04.3Carcinoma in situ of skin of other and unspecified parts of faceD04.4Carcinoma in situ of skin of scalp and neckbillableD04.5Carcinoma in situ of skin of trunkbillableD04.6Carcinoma in situ of skin of upper limb, including shoulderD04.7Carcinoma in situ of skin of lower limb, including hipD04.8Carcinoma in situ of skin of other sitesbillable
Coverage-related procedures and services
CPT 81202high
APC (ADENOMATOUS POLYPOSIS COLI) (EG, FAMILIAL ADENOMATOSIS POLYPOSIS [FAP], ATTENUATED FAP) GENE ANALYSIS; KNOWN FAMILIAL VARIANTS
Source: CMS coverage guidance
CPT 81215high
BRCA1 (BRCA1, DNA REPAIR ASSOCIATED) (EG, HEREDITARY BREAST AND OVARIAN CANCER) GENE ANALYSIS; KNOWN FAMILIAL VARIANT
Source: CMS coverage guidance
CPT 81217high
BRCA2 (BRCA2, DNA REPAIR ASSOCIATED) (EG, HEREDITARY BREAST AND OVARIAN CANCER) GENE ANALYSIS; KNOWN FAMILIAL VARIANT
Source: CMS coverage guidance
CPT 0129Uhigh
HEREDITARY BREAST CANCER-RELATED DISORDERS (EG, HEREDITARY BREAST CANCER, HEREDITARY OVARIAN CANCER, HEREDITARY ENDOMETRIAL CANCER), GENOMIC SEQUENCE ANALYSIS AND DELETION/DUPLICATION ANALYSIS PANEL (ATM, BRCA1, BRCA2, CDH1, CHEK2, PALB2, PTEN, AND TP53)
Source: CMS coverage guidance
CPT 0102Uhigh
HEREDITARY BREAST CANCER-RELATED DISORDERS (EG, HEREDITARY BREAST CANCER, HEREDITARY OVARIAN CANCER, HEREDITARY ENDOMETRIAL CANCER), GENOMIC SEQUENCE ANALYSIS PANEL UTILIZING A COMBINATION OF NGS, SANGER, MLPA, AND ARRAY CGH, WITH MMRNA ANALYTICS TO RESOLVE VARIANTS OF UNKNOWN SIGNIFICANCE WHEN INDICATED (17 GENES [SEQUENCING AND DELETION/DUPLICATION])
Source: CMS coverage guidance
CPT 81432high
HEREDITARY BREAST CANCER-RELATED DISORDERS (EG, HEREDITARY BREAST CANCER, HEREDITARY OVARIAN CANCER, HEREDITARY ENDOMETRIAL CANCER, HEREDITARY PANCREATIC CANCER, HEREDITARY PROSTATE CANCER), GENOMIC SEQUENCE ANALYSIS PANEL, 5 OR MORE GENES, INTERROGATION FOR SEQUENCE VARIANTS AND COPY NUMBER VARIANTS
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 403881002high
Atrophic squamous cell carcinoma in situ of skin
Source: SNOMED International ICD-10 map
SNOMED_CT 80071000119103high
Basal cell carcinoma of skin in situ
Source: SNOMED International ICD-10 map
SNOMED_CT 92707003high
Carcinoma in situ of sebaceous gland
Source: SNOMED International ICD-10 map
SNOMED_CT 92749008high
Carcinoma in situ of skin
Source: SNOMED International ICD-10 map
SNOMED_CT 255145006high
Carcinoma in situ of surface epithelium
Source: SNOMED International ICD-10 map
SNOMED_CT 92762007high
Carcinoma in situ of sweat gland
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
D04.9
Common synonyms
Carcinoma in situ of skin, unspecifiedCarcinoma in situ of skin
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.