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ICD-10-CM 2027 diagnosis code

Q66.2Congenital metatarsus (primus) varus

Not billable — use a more specific code

Q66.2 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q66.2

Q66.2 is the ICD-10-CM diagnosis code for congenital metatarsus (primus) varus. It belongs to category Q66 (congenital deformities of feet), block Q65-Q79 (congenital malformations and deformations of the musculoskeletal system) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within Q66 (congenital deformities of feet), Q66.2 is specifically for congenital metatarsus (primus) varus. Related codes cover congenital talipes equinovarus (Q66.0), congenital talipes calcaneovarus (Q66.1), other congenital varus deformities of feet (Q66.3), congenital talipes calcaneovalgus (Q66.4), congenital pes planus (Q66.5), other congenital valgus deformities of feet (Q66.6), congenital pes cavus (Q66.7), other congenital deformities of feet (Q66.8) and 1 more.

To report this condition, pick the subcode that matches the documentation: Q66.21 (varus) and Q66.22 (adductus).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2017 (expanded into subcodes).

Specific codes under Q66.2

Notes that apply from higher levels

Instructions written at a parent level also apply to Q66.2.

› From Q66 Congenital deformities of feet
Excludes1
  • reduction defects of feet (Q72.-)
  • valgus deformities (acquired) (M21.0-)
  • varus deformities (acquired) (M21.1-)

Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • FY2017 (effective 10/1/2016): Expanded — no longer billable

Common questions about Q66.2

Is Q66.2 billable?

No. Q66.2 is a header code. Report one of its more specific subcodes instead.