Q66.90 vs Q72
Q66.90 (Congenital deformity of feet, unspecified, unspecified foot) compared with Q72 (Reduction defects of lower limb), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. Q66.90 carries an Excludes1 note covering Q72: “reduction defects of feet (Q72.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| Q66.90Congenital deformity of feet, unspecified, unspecified foot | Q72Reduction defects of lower limb | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) |
| Definition | Congenital deformity of feet, unspecified, unspecified foot is a billable ICD-10-CM diagnosis code (Q66.90). | Reduction defects of lower limb is a non-billable ICD-10-CM category code (Q72). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources