M79.662 (Pain in left lower leg) compared with M79.669 (Pain in unspecified lower leg), from the official CMS tabular data. M79.662 and M79.669 code the same condition on opposite sides.
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. M79.662 and M79.669 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.
| M79.662Pain in left lower leg | M79.669Pain in unspecified lower leg | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Pain in left lower leg is a billable ICD-10-CM diagnosis code (M79.662). | Pain in unspecified lower leg is a billable ICD-10-CM diagnosis code (M79.669). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources