All ICD10 Codes
Q66Not billable, use a more specific code below

Congenital deformities of feet

In Congenital malformations and deformations of the musculoskeletal system (Q65-Q79), chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities

32 billable codes under Q66: none are a CC or MCC; none map to an HCC.

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Instructional notes

Excludes1: not coded here, use a different code

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

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Assign Q00-QA1 codes for documented congenital anomalies or genetic disorders at any age, coding non-inherent manifestations separately and sequencing Z38 first on the birth admission.

Read Section I.C.17 (page 74)

All codes under Q66

Q66 can't be used on a claim. Pick a billable code below; grey headings group them.

Q66 MS-DRGs

As the principal diagnosis, the billable codes under Q66 group to MS-DRG 564, 565, 566, or 795 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to Q66

Notes on these codes point to Q66.

  • M20 Excludes1: congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)
  • M21 Excludes1: congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Birth Defects

A birth defect is a problem that happens while a baby is developing in the mother's body. Most birth defects happen during the first 3 months of pregnancy. One out of every 33 babies in the United States is born with a birth defect.

Read more about birth defects on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.