Advrs effect of keratolyt/keratplst/hair trmt drug, sequela

This code signifies a lasting health problem or complication that arose from a previous adverse reaction to medications or preparations used to treat skin conditions involving keratin, or for hair care. This could include persistent skin irritation, scarring, or hair follicle damage that remains after the initial acute adverse effect has resolved.

Apply this code when documenting a chronic or residual condition directly attributable to an adverse effect from a keratolytic, keratoplastic, or hair treatment drug or preparation. This is appropriate when the acute phase of the adverse reaction has passed, but a permanent or long-term consequence persists. For instance, if a patient developed permanent alopecia due to a severe allergic reaction to a hair dye years ago.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., L65.9 for nonscarring hair loss).
• Ensure documentation clearly links the current condition to a past adverse effect of the specified drug categories.
• Do not use this code for acute adverse effects; use the appropriate acute adverse effect code from the T49.4X- category instead.