C44.90 Unspecified malignant neoplasm of skin, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Malignant neoplasm of unspecified site of skin

Applies from C44 Other and unspecified malignant neoplasm of skin

Includes

• malignant neoplasm of sebaceous glands
• malignant neoplasm of sweat glands

Excludes1 (never code together)

• Kaposi's sarcoma of skin (C46.0)
• malignant melanoma of skin (C43.-)
• malignant neoplasm of skin of genital organs (C51-C52, C60.-, C63.2)
• Merkel cell carcinoma (C4A.-)

MS-DRG index

Defines the logic of DRG(s) 606-607 in MDC 09.

Approximate ICD-9-CM (GEMs)

• 173.90 Unspecified malignant neoplasm of skin, site unspecified

Code annotations containing back-references to C44.90

Back-references to C44

• Type 1 Excludes: C76 Malignant neoplasm of other and ill-defined sites ("malignant neoplasm of skin (C44.-)")

Nearby codes

• C44.80 Unspecified malignant neoplasm of overlapping sites of skin
• C44.81 Basal cell carcinoma of overlapping sites of skin
• C44.82 Squamous cell carcinoma of overlapping sites of skin
• C44.89 Other specified malignant neoplasm of overlapping sites of skin
• C44.9 Other and unspecified malignant neoplasm of skin, unspecified
• C44.90 Unspecified malignant neoplasm of skin, unspecified (this code)
• C44.91 Basal cell carcinoma of skin, unspecified
• C44.92 Squamous cell carcinoma of skin, unspecified
• C44.99 Other specified malignant neoplasm of skin, unspecified