Congenital metatarsus primus varus, left foot

This code describes a congenital deformity of the left foot where the first metatarsal bone is angled inward, away from the other metatarsals. This inward deviation of the great toe's metatarsal is present at birth and can contribute to other foot deformities like bunions.

Use this code when documentation explicitly states a diagnosis of congenital metatarsus primus varus affecting the left foot. This diagnosis is typically made by a physician based on physical examination and imaging studies (e.g., X-rays) confirming the abnormal angulation of the first metatarsal.

• Ensure the documentation specifies "congenital" to differentiate from acquired conditions.
• Verify laterality; this code is specific to the left foot. Use Q66.211 for the right foot and Q66.219 for unspecified.
• Do not confuse with hallux valgus (bunion), though metatarsus primus varus can be a contributing factor. Code both conditions if documented.