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Q66 ICD-10-CM Code: Congenital deformities of feet

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Official description

Q66

Congenital deformities of feet

ICD-10-CM diagnosis code · United States clinical modification

Where Q66 sits

  1. 1

    Chapter 17

    Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)

  2. 2

    Section

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

  3. 3

    Category Q66

    Congenital deformities of feet

  4. 4

    Code Q66

    Congenital deformities of feet

Codes under Q66

Q66 is a non-billable category. Choose the child code that best matches the documented diagnosis.

Q66.0Congenital talipes equinovarusQ66.1Congenital talipes calcaneovarusQ66.2Congenital metatarsus (primus) varusQ66.3Other congenital varus deformities of feetQ66.4Congenital talipes calcaneovalgusQ66.5Congenital pes planusQ66.6Other congenital valgus deformities of feetQ66.7Congenital pes cavusQ66.8Other congenital deformities of feetQ66.9Congenital deformity of feet, unspecified

Notes for this code

Inclusion terms

No inclusion terms are listed for Q66.

Code first

No “code first” instruction is listed for Q66.

Use additional code

No “use additional code” instruction is listed for Q66.

Excludes1

Conditions that should not be reported together with this code.

  • reduction defects of feet (Q72.-)
  • valgus deformities (acquired) (M21.0-)
  • varus deformities (acquired) (M21.1-)

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for Q66.

Source and release

Data release
U.S. ICD-10-CM · FY 2027
Effective date
Oct 1, 2026

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Frequently asked questions

What does ICD-10-CM code Q66 mean?

Q66 is the FY 2027 U.S. ICD-10-CM code for “Congenital deformities of feet.”

Is Q66 a billable or specific ICD-10-CM code?

No. Q66 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is Q66 located in ICD-10-CM?

Q66 is listed in Chapter 17, Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1), within Congenital malformations and deformations of the musculoskeletal system (Q65-Q79) (Q65–Q79), under category Q66, Congenital deformities of feet.

What coding notes are listed for Q66?

No inclusion terms are listed for Q66 in this reference record. No code-first instruction is listed. Excludes1 notes: reduction defects of feet (Q72.-); valgus deformities (acquired) (M21.0-); varus deformities (acquired) (M21.1-). No Excludes2 note is listed.