Hallux varus (acquired), unspecified foot

This code describes an acquired deformity of the great toe where it deviates medially, away from the other toes, in an unspecified foot. This condition is typically not present at birth but develops over time due to various factors. It can cause pain, difficulty with footwear, and gait disturbances.

Use this code when documentation specifies an acquired hallux varus without laterality specified (e.g., "hallux varus, acquired"). This code is appropriate when the physician's notes clearly indicate the medial deviation of the great toe and confirm its acquired nature, but do not specify if it affects the right or left foot.

• Do not use this code if the documentation specifies congenital hallux varus; refer to codes in the Q66 category.
• Avoid using this code if laterality (right or left foot) is documented; instead, select the more specific M20.31 or M20.32.
• Ensure the documentation explicitly states "acquired" to differentiate from congenital forms.