2026 ICD-10-CM Diagnosis Code C43.111Malignant melanoma of right upper eyelid, including canthus

ICD-10-CM Codes›C00–D49›C43-C44›C43

ICD-10-CM C43.111
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C43.111 is a billable ICD-10-CM diagnosis code for malignant melanoma of right upper 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
C43.111
Billable Status
Yes — Valid for Submission
Code Describes
Malignant melanoma of right upper eyelid, including canthus
Short Description
Malignant melanoma of right upper eyelid, including canthus
Same as the full description in the CMS dataset.
Parent Code
C43.11
Malignant melanoma of right eyelid, including canthus

Code Classification

ChapterC00–D49Neoplasms
SectionC43-C44Melanoma and other malignant neoplasms of skin
CategoryC43Malignant melanoma of skin
This CodeC43.111Malignant melanoma of right upper eyelid, including canthus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Malignant melanoma of eyelid
  • Malignant melanoma of skin of eyelid
  • Malignant melanoma of skin of right upper eyelid
  • Malignant melanoma of skin of upper eyelid

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.

Code History & ChangesHistory

Replacement C43.111 replaces the following previously assigned code(s):

  • C43.11 - Malignant melanoma of right eyelid, including canthus
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C43.111Overview

Is C43.111 (Malignant melanoma of right eyelid, including canthus) a billable code?

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

What MS-DRG does C43.111 group to?

When malignant melanoma of right upper 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.

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.