D31.6 (Benign neoplasm of unspecified site of orbit) compared with D49.89 (Neoplasm of unspecified behavior of other specified sites), from the official CMS tabular data. D31.6 and D49.89 name the same anatomical site (connective tissue) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (connective tissue)
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. D49.89 and D31.6 name the same anatomical site (connective tissue) with a different neoplasm behavior.
From the CMS/CDC 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.
| D31.6Benign neoplasm of unspecified site of orbit | D49.89Neoplasm of unspecified behavior of other specified sites | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Benign neoplasm of unspecified site of orbit is a non-billable ICD-10-CM category code (D31.6). | Neoplasm of unspecified behavior of other specified sites is a billable ICD-10-CM diagnosis code (D49.89). |
| Includes | Benign neoplasm of connective tissue of orbit Benign neoplasm of extraocular muscle Benign neoplasm of peripheral nerves of orbit Benign neoplasm of retrobulbar tissue | '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