C78.00 (Secondary malignant neoplasm of unspecified lung) compared with C78.02 (Secondary malignant neoplasm of left lung), from the official CMS tabular data. C78.00 and C78.02 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. C78.00 and C78.02 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.
| C78.00Secondary malignant neoplasm of unspecified lung | C78.02Secondary malignant neoplasm of left lung | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Secondary malignant neoplasm of unspecified lung is a billable ICD-10-CM diagnosis code (C78.00). | Secondary malignant neoplasm of left lung is a billable ICD-10-CM diagnosis code (C78.02). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources