M85.052 (Fibrous dysplasia (monostotic), left thigh) compared with M85.059 (Fibrous dysplasia (monostotic), unspecified thigh), from the official CMS tabular data. M85.052 and M85.059 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. M85.052 and M85.059 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.
| M85.052Fibrous dysplasia (monostotic), left thigh | M85.059Fibrous dysplasia (monostotic), 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 | Fibrous dysplasia (monostotic), left thigh is a billable ICD-10-CM diagnosis code (M85.052). | Fibrous dysplasia (monostotic), unspecified thigh is a billable ICD-10-CM diagnosis code (M85.059). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources