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ICD-10-CM 2027

ICD-10 code for primus varus

Q66.21

Congenital metatarsus primus varus

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Primus varus”. Page updated September 29, 2026.

About coding primus varus

The ICD-10-CM code for primus varus is Q66.21 (Congenital metatarsus primus varus).

Within Q66.2 (congenital metatarsus (primus) varus), Q66.21 is specifically for congenital metatarsus primus varus. Related codes cover adductus (Q66.22).

To report this condition, pick the subcode that matches the documentation: Q66.211 (right foot), Q66.212 (left foot) and Q66.219 (unspecified foot).

It was added in FY2017, effective October 1, 2016, and changed in FY2020.

Common questions about primus varus ICD-10 codes

What is the ICD-10 code for primus varus?

Q66.21 — Congenital metatarsus primus varus (a header code; report a more specific subcode).

Is Q66.21 billable?

No. Q66.21 is a header code. Report one of its more specific subcodes instead.