M85.851 (Other specified disorders of bone density and structure, right thigh) compared with M85.859 (Other specified disorders of bone density and structure, unspecified thigh), from the official CMS tabular data. M85.851 and M85.859 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. M85.851 and M85.859 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.
| M85.851Other specified disorders of bone density and structure, right thigh | M85.859Other specified disorders of bone density and structure, unspecified thigh | |
|---|---|---|
| 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 | Other specified disorders of bone density and structure, right thigh is a billable ICD-10-CM diagnosis code (M85.851). | Other specified disorders of bone density and structure, unspecified thigh is a billable ICD-10-CM diagnosis code (M85.859). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources