2026 ICD-10-CM Diagnosis Code D03.122Melanoma in situ of left lower eyelid, including canthus

ICD-10-CM Codes›C00–D49›D00-D09›D03

ICD-10-CM D03.122
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D03.122 is a billable ICD-10-CM diagnosis code for melanoma in situ of left lower 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 melanoma in situ of eyelid, including canthus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin cancers - melanoma.

Code Identity

ICD-10-CM Code
D03.122
Billable Status
Yes — Valid for Submission
Code Describes
Melanoma in situ of left lower eyelid, including canthus
Short Description
Melanoma in situ of left lower eyelid, including canthus
Same as the full description in the CMS dataset.
Parent Code
D03.12
Melanoma in situ of left eyelid, including canthus

Code Classification

ChapterC00–D49Neoplasms
SectionD00-D09In situ neoplasms
CategoryD03Melanoma in situ
This CodeD03.122Melanoma in situ of left lower eyelid, including canthus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Melanoma in situ of eyelid, including canthus
  • Melanoma in situ of left lower 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

Melanoma

Melanoma is the most serious type of skin cancer. Often the first sign of melanoma is a change in the size, shape, color, or feel of a mole. Most melanomas have a black or black-blue area. Melanoma may also appear as a new mole. It may be black, abnormal, or "ugly looking."

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement D03.122 replaces the following previously assigned code(s):

  • D03.12 - Melanoma in situ of left 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 D03.122Overview

Is D03.122 (Melanoma in situ of left eyelid, including canthus) a billable code?

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

What MS-DRG does D03.122 group to?

When melanoma in situ of left lower 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.