C44.791 Other specified malignant neoplasm of skin of unspecified lower limb, including hip

ICD-10-CM Code C44.791: Other Specified Malignant Neoplasm of Skin of Unspecified Lower Limb, Including Hip

ICD-10-CM code C44.791 identifies other specified malignant neoplasms of the skin on an unspecified lower limb, including the hip. This active diagnosis concept is classified as a neoplastic process and is used in non-melanoma skin cancer surveillance, while related codes distinguish laterality. 1 4

Plain-language overview

Code C44.791 represents an active neoplastic process for a specific type of skin cancer located on a lower limb or hip when the exact side is not specified. 1

What this code represents

The official label for C44.791 is other specified malignant neoplasm of skin of unspecified lower limb, including hip, and it falls under the parent concept C44.79. 1

This diagnosis code is included in a defined list of ICD-10-CM diagnosis codes used to identify non-melanoma skin cancer for surveillance purposes alongside right and left side variants. 4

Coding details

Code C44.791 has narrower concepts within the terminology and shares the C44.79 parent category with distinct codes specifying right and left lower limb malignancies. 1 4

Distinct codes C44.792 and C44.799 exist to specify other malignant neoplasms of the skin of the right and left lower limbs, including the hip, respectively. 4

Documentation considerations

The terminology record for C44.791 includes an abbreviation for other malignant neoplasm of the skin of an unspecified lower limb, including the hip, and notes the existence of narrower concepts. 1

Coverage and utilization context

Codes for other specified malignant neoplasms of the right and left lower limb appear within Medicare billing and coding articles concerning skin lesion removals. 2 3

What the sources add

While the terminology record defines the active diagnosis, Medicare articles provide operational billing context for related malignant skin lesions, and surveillance reports establish its use in non-melanoma tracking. 1 2 4

The National Cancer Institute record provides the exact preferred name and abbreviation, whereas the surveillance source groups this unspecified code with specific right and left lower limb diagnoses. 1 4

Sources

1. ICD-10-CM C44.791 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Article - Billing and Coding: Removal of Benign and Malignant Skin Lesions (A56346) — cms.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Benign Skin Lesion Removal (Excludes Actinic Keratosis, and Mohs) (A57161) — cms.gov; accessed 2026-07-27.
4. Disclaimer — sentinelinitiative.org; accessed 2026-07-27.