Q66.3 Other congenital varus deformities of feet

The ICD-10-CM code for Other congenital varus deformities of feet is Q66.3 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

17: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)

Section

Q65-Q79: Congenital malformations and deformations of the musculoskeletal system (Q65-Q79)

Category Q66

44 codes (32 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q66.3:

• Talipes (congenital) › varus
• Anomaly, anomalous (congenital) (unspecified type) › foot NEC › varus (congenital)
• Deformity › foot (acquired) › varus (congenital) NEC
• Hallux › varus (acquired) › congenital

Inclusion Terms

• Hallux varus, congenital

U.S. Hospital Utilization

• An estimated 340 U.S. inpatient stays in 2019 included Q66.3 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

POA indicator for congenital conditions/anomalies and Q00-Q99 exception

Congenital conditions and anomalies Assign “Y” for congenital conditions and anomalies except for categories Q00- Q99, Congenital anomalies, which are on the exempt list. Congenital conditions are always considered present on admission.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)