C72.20 (Malignant neoplasm of unspecified olfactory nerve) compared with C72.21 (Malignant neoplasm of right olfactory nerve), from the official CMS tabular data. C72.20 and C72.21 code the same condition on opposite sides. MedCoder-derived
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. C72.20 and C72.21 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| C72.20Malignant neoplasm of unspecified olfactory nerve | C72.21Malignant neoplasm of right olfactory nerve | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of unspecified olfactory nerve is a billable ICD-10-CM diagnosis code (C72.20). | Malignant neoplasm of right olfactory nerve is a billable ICD-10-CM diagnosis code (C72.21). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources