2026 ICD-10-CM Diagnosis Code C43.10Malignant melanoma of unspecified eyelid, including canthus

ICD-10-CM Codes›C00–D49›C43-C44›C43

ICD-10-CM C43.10
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C43.10 is a billable ICD-10-CM diagnosis code for malignant melanoma of unspecified eyelid, including canthus. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. Coders also document this condition as malignant melanoma of eyelid. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin cancers - melanoma.

Code Identity

ICD-10-CM Code
C43.10
Billable Status
Yes — Valid for Submission
Code Describes
Malignant melanoma of unspecified eyelid, including canthus
Short Description
Malignant melanoma of unspecified eyelid, including canthus
Same as the full description in the CMS dataset.
Parent Code
C43.1
Malignant melanoma of eyelid, including canthus

Code Classification

ChapterC00–D49Neoplasms
SectionC43-C44Melanoma and other malignant neoplasms of skin
CategoryC43Malignant melanoma of skin
This CodeC43.10Malignant melanoma of unspecified eyelid, including canthus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Malignant melanoma of eyelid
  • Malignant melanoma of skin of canthus of eye
  • Malignant melanoma of skin of eyelid
  • Malignant melanoma of skin of lower eyelid
  • Malignant melanoma of skin of upper eyelid
  • Malignant neoplasm of canthus

Clinical ClassificationClinical

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

CCSR NEO025
Skin cancers - melanoma
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Eyelid Disorders

Your eyelids help protect your eyes. When you blink, your eyelids spread moisture over your eyes. Blinking also helps move dirt or other particles off the surface of the eye. You close your eyelids when you see something coming toward your eyes. This can help protect against injuries.

Read the full article at MedlinePlus

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

Convert C43.10 to ICD-9-CMHistory

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

ICD-9-CM
172.1 Malig melanoma eyelid
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 C43.10Overview

Is C43.10 (Malignant melanoma of eyelid, including canthus) a billable code?

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

What MS-DRG does C43.10 group to?

When malignant melanoma of unspecified eyelid, including canthus is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C43.10?

Under the General Equivalence Mappings, malignant melanoma of unspecified eyelid, including canthus converts to ICD-9-CM 172.1 (malig melanoma eyelid). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.