Hypertrophic scar

This code identifies a hypertrophic scar, which is an elevated, red, and often itchy scar that remains within the boundaries of the original wound. It results from an overproduction of collagen during the healing process, typically appearing weeks to months after skin injury.

Assign this code when documentation specifies a hypertrophic scar, often noted after surgical incisions, burns, or traumatic injuries. Supporting documentation should clearly distinguish it from other scar types, particularly keloids.

• Differentiate from keloid scars (L91.0) which extend beyond the original wound margins.
• Do not use for unspecified scars; refer to the Excludes2 note for "scar NOS."
• Code the underlying cause of the scar (e.g., burn, injury) as an additional diagnosis if still relevant and being treated.