External constriction of part of scalp, sequela

This code signifies a long-term or late effect resulting from an external constriction affecting a portion of the scalp. This could stem from various causes, such as a tight head covering, hair accessory, or other external pressure that previously restricted blood flow or caused tissue damage to the scalp. The sequela indicates a residual condition or complication that persists after the initial constricting force has been removed.

Apply this code when documentation clearly indicates a current, persistent condition of the scalp that is a direct consequence of a past external constriction. This includes conditions like localized alopecia, scarring, skin atrophy, or chronic pain directly attributable to the previous constriction. The medical record should specify the nature of the sequela and its causal link to the prior external constriction.

• Always use an additional code to identify the specific nature of the sequela (e.g., L66.9 for alopecia, L90.5 for scar conditions).
• Ensure the documentation explicitly states that the condition is a sequela or late effect of a past external constriction, not an acute injury.
• Do not use this code for acute external constrictions; those would be coded with an initial encounter or subsequent encounter code from the S00.04- category.