2026 ICD-10-CM Diagnosis Code C44.00Unspecified malignant neoplasm of skin of lip

ICD-10-CM Codes›C00–D49›C43-C44›C44

ICD-10-CM C44.00
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C44.00 is a billable ICD-10-CM diagnosis code for unspecified malignant neoplasm of skin of lip. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 606 through 607. Coders also document this condition as primary malignant neoplasm of skin of lip. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin cancers - all other types.

Code Identity

ICD-10-CM Code
C44.00
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified malignant neoplasm of skin of lip
Short Description
Unspecified malignant neoplasm of skin of lip
Same as the full description in the CMS dataset.
Parent Code
C44.0
Other and unspecified malignant neoplasm of skin of lip

Code Classification

ChapterC00–D49Neoplasms
SectionC43-C44Melanoma and other malignant neoplasms of skin
CategoryC44Other and unspecified malignant neoplasm of skin
This CodeC44.00Unspecified malignant neoplasm of skin of lip

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Primary malignant neoplasm of skin of lip

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.
lip › skin (commissure) (lower) (upper)C44.00C79.2D04.0D23.0D48.5D49.2
skin NOS › lip (lower) (upper)C44.00C79.2D04.0D23.0D48.5D49.2

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 C44.00 to ICD-9-CMHistory

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

ICD-9-CM
173.00 Malig neopl skin lip NOS
Exact Match The mapping is direct, with no qualifiers.

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 C44.00Overview

What is the ICD-10 code for unspecified malignant neoplasm of skin of lip?

The ICD-10-CM code for unspecified malignant neoplasm of skin of lip is C44.00 (sometimes written as C4400). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is C44.00 (Other and unspecified malignant neoplasm of skin of lip) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified malignant neoplasm of skin of lip on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C44.00 group to?

When unspecified malignant neoplasm of skin of lip is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 606, 607, with relative weights from 0.9064 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C44.00?

Under the General Equivalence Mappings, unspecified malignant neoplasm of skin of lip converts to ICD-9-CM 173.00 (malig neopl skin lip NOS). The mapping is a direct match.