C43.31 Malignant melanoma of nose

Billable ICD-10-CM code, FY2026.

Applies from C43 Malignant melanoma of skin

Excludes1 (never code together)

• melanoma in situ (D03.-)

Excludes2 (not included here)

• malignant melanoma of skin of genital organs (C51-C52, C60.-, C63.-)
• Merkel cell carcinoma (C4A.-)
• sites other than skin-code to malignant neoplasm of the site

Risk adjustment (HCC)

• CMS-HCC V28: HCC 23 — Prostate, Breast, and Other Cancers and Tumors
• CMS-HCC V22: HCC 12 — Breast, Prostate, and Other Cancers and Tumors
• RxHCC V08: HCC 22 — Prostate, Breast, Bladder, and Other Cancers and Tumors
• ESRD V24: HCC 12

MS-DRG index

Defines the logic of DRG(s) 595-596 in MDC 09.

Approximate ICD-9-CM (GEMs)

• 172.3 Malignant melanoma of skin of other and unspecified parts of face (approximate)

Code annotations containing back-references to C43.31

Back-references to C43.31

• Type 1 Excludes: C30.0 Malignant neoplasm of nasal cavity ("malignant melanoma of skin of nose (C43.31)")

Back-references to C43

• Type 1 Excludes: C44 Other and unspecified malignant neoplasm of skin ("malignant melanoma of skin (C43.-)")

Diagnosis Index entries for C43.31

• Melanoma (malignant) › skin › ala nasi
• Melanoma (malignant) › skin › nose (external)

Nearby codes

• C43.20 Malignant melanoma of unspecified ear and external auricular canal
• C43.21 Malignant melanoma of right ear and external auricular canal
• C43.22 Malignant melanoma of left ear and external auricular canal
• C43.3 Malignant melanoma of other and unspecified parts of face
• C43.30 Malignant melanoma of unspecified part of face
• C43.31 Malignant melanoma of nose (this code)
• C43.39 Malignant melanoma of other parts of face
• C43.4 Malignant melanoma of scalp and neck
• C43.5 Malignant melanoma of trunk
• C43.51 Malignant melanoma of anal skin
• C43.52 Malignant melanoma of skin of breast