D30.1 (Benign neoplasm of renal pelvis) compared with D41.1 (Neoplasm of uncertain behavior of renal pelvis), from the official CMS tabular data. D30.1 and D41.1 name the same anatomical site (calyx) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (calyx)
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. D30.1 and D41.1 name the same anatomical site (calyx) 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.
| D30.1Benign neoplasm of renal pelvis | D41.1Neoplasm of uncertain behavior of renal pelvis | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Benign neoplasm of renal pelvis is a non-billable ICD-10-CM category code (D30.1). | Neoplasm of uncertain behavior of renal pelvis is a non-billable ICD-10-CM category code (D41.1). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources