Q66.50 (Congenital pes planus, unspecified foot) compared with Q66.51 (Congenital pes planus, right foot), from the official CMS tabular data. Q66.50 and Q66.51 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. Q66.50 and Q66.51 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.
| Q66.50Congenital pes planus, unspecified foot | Q66.51Congenital pes planus, right foot | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) |
| Definition | Congenital pes planus, unspecified foot is a billable ICD-10-CM diagnosis code (Q66.50). | Congenital pes planus, right foot is a billable ICD-10-CM diagnosis code (Q66.51). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources