What does ICD-10 code D04 mean?

ICD-10 code D04 is the standardized code used for carcinoma in situ of skin in medical records and coding systems.

When is ICD-10 code D04 used?

Doctors, hospitals, and insurers may use ICD-10 code D04 when recording carcinoma in situ of skin in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code D04 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code D04: Carcinoma in situ of skin

Name: ICD-10 Code D04: Carcinoma in situ of skin
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:03:35.163Z

D04 is an ICD-10 diagnosis entry used to group records related to Carcinoma in situ of skin. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Neoplasms (C00-D49).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. 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 in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

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.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

2Neoplasms (C00-D49)

block

D00-D09In situ neoplasms

currentD00-D09

Official coding notes

Excludes1 (do not code together)

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

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

OncologistGeneral PhysicianDermatologist

Sibling codes

D00Carcinoma in situ of oral cavity, esophagus and stomach D01Carcinoma in situ of other and unspecified digestive organs D02Carcinoma in situ of middle ear and respiratory system D03Melanoma in situ D05Carcinoma in situ of breast D06Carcinoma in situ of cervix uteri D07Carcinoma in situ of other and unspecified genital organs D09Carcinoma in situ of other and unspecified sites

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

D04

Replacement codes

D04.0 — Carcinoma in situ of skin of lipD04.4 — Carcinoma in situ of skin of scalp and neckD04.5 — Carcinoma in situ of skin of trunkD04.8 — Carcinoma in situ of skin of other sitesD04.9 — Carcinoma in situ of skin, unspecified

Common synonyms

Carcinoma 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.