Hallux valgus (acquired), unspecified foot

This code describes an acquired lateral deviation of the great toe, commonly known as a bunion, where the first metatarsal bone deviates medially. This deformity can lead to pain, inflammation, and difficulty with footwear. The "unspecified foot" indicates that laterality (left or right) is not documented.

This code is appropriate when documentation confirms a diagnosis of hallux valgus without specifying whether it affects the left or right foot. It is used for acquired bunions, not congenital deformities. Use this code when the provider's notes clearly state "hallux valgus" or "bunion" but omit laterality.

• Avoid using this code if laterality is documented; instead, choose the more specific M20.11 (right foot) or M20.12 (left foot).
• Ensure the documentation specifies "acquired" hallux valgus. If congenital, a code from Q66.5- (Congenital talipes equinovarus) or Q74.2 (Other congenital malformations of foot, including hallux valgus) may be more appropriate.
• Do not use this code for hallux rigidus (M20.2-), which is a degenerative arthritis of the great toe MTP joint, not a lateral deviation.