2026 ICD-10-CM Diagnosis Code D04.4Carcinoma in situ of skin of scalp and neck

ICD-10-CM Codes›C00–D49›D00-D09›D04

ICD-10-CM D04.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D04.4 is a billable ICD-10-CM diagnosis code for carcinoma in situ of skin of scalp and neck. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. Coders also document this condition as carcinoma in situ of scalp. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin cancers - all other types.

Code Identity

ICD-10-CM Code
D04.4
Billable Status
Yes — Valid for Submission
Code Describes
Carcinoma in situ of skin of scalp and neck
Short Description
Carcinoma in situ of skin of scalp and neck
Same as the full description in the CMS dataset.
Parent Code
D04
Carcinoma in situ of skin

Code Classification

ChapterC00–D49Neoplasms
SectionD00-D09In situ neoplasms
CategoryD04Carcinoma in situ of skin
This CodeD04.4Carcinoma in situ of skin of scalp and neck

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Carcinoma in situ of scalp
  • Carcinoma in situ of scalp and skin of neck
  • Carcinoma in situ of skin of neck
  • Carcinoma in situ of skin of scalp
  • Carcinoma in situ of skin of temporal region
  • Squamous cell carcinoma in situ of skin of neck
  • Squamous cell carcinoma in situ of skin of scalp

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO028
Skin cancers - all other types
Default principal diagnosis: inpatient Yes · outpatient Yes

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
head NECC76.0C79.89D04.4D36.7D48.7D49.89
scalpC44.40C79.2D04.4D23.4D48.5D49.2
skin NOS › cervical region [See Also: Neoplasm, skin, neck]C44.40C79.2D04.4D23.4D48.5D49.2
skin NOS › head NEC [See Also: Neoplasm, skin, scalp]C44.40C79.2D04.4D23.4D48.5D49.2
skin NOS › neckC44.40C79.2D04.4D23.4D48.5D49.2
skin NOS › scalpC44.40C79.2D04.4D23.4D48.5D49.2
skin NOS › supraclavicular region [See Also: Neoplasm, skin, neck]C44.40C79.2D04.4D23.4D48.5D49.2

Patient EducationClinical

Skin Cancer

Skin cancer is the most common form of cancer in the United States. The two most common types are basal cell cancer and squamous cell cancer. They usually form on the head, face, neck, hands, and arms. Another type of skin cancer, melanoma, is more dangerous but less common.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert D04.4 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
232.4 Ca in situ scalp
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About D04.4Overview

Is D04.4 (Carcinoma in situ of skin) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report carcinoma in situ of skin of scalp and neck on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does D04.4 group to?

When carcinoma in situ of skin of scalp and neck is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of D04.4?

Under the General Equivalence Mappings, carcinoma in situ of skin of scalp and neck converts to ICD-9-CM 232.4 (ca in situ scalp). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.