C44.500 (Unspecified malignant neoplasm of anal skin) compared with D49.2 (Neoplasm of unspecified behavior of bone, soft tissue, and skin), from the official CMS tabular data. C44.500 and D49.2 name the same anatomical site (anus) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — unspecified behavior (anus)
The behavior documented for the site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column of the neoplasm table, and therefore which code, applies.
Source: CMS Table of Neoplasms
Same site, different neoplasm behavior. C44.500 and D49.2 name the same anatomical site (anus) with a different neoplasm behavior.
From the CMS Table of Neoplasms: the behavior documented for that site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column, and therefore which code, applies.
| C44.500Unspecified malignant neoplasm of anal skin | D49.2Neoplasm of unspecified behavior of bone, soft tissue, and skin | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Unspecified malignant neoplasm of anal skin is a billable ICD-10-CM diagnosis code (C44.500). | Neoplasm of unspecified behavior of bone, soft tissue, and skin is a billable ICD-10-CM diagnosis code (D49.2). |
| Includes | malignant neoplasm of sebaceous glands malignant neoplasm of sweat glands Unspecified malignant neoplasm of anal margin Unspecified malignant neoplasm of perianal skin | 'growth' NOS neoplasm NOS new growth NOS tumor NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources