Underdosing of other antidepressants, sequela

This code signifies a patient's current health condition or complication that is a direct result of a past underdosing of an antidepressant medication not otherwise specified. The underdosing event itself is no longer active, but its lasting effects are being addressed. This could include a recurrence of depression or other psychiatric symptoms due to insufficient medication levels over time.

Apply this code when documenting a patient presenting with ongoing or new symptoms directly attributable to a historical period of inadequate antidepressant dosage. This is appropriate for situations where the underdosing is no longer occurring, but its long-term consequences are being managed. For example, a patient presenting with a relapse of major depressive disorder after previously not taking their prescribed antidepressant consistently.

• This code requires a seventh character of "S" for sequela, indicating a late effect.
• Always sequence this code after the code(s) for the specific condition(s) resulting from the underdosing (e.g., major depressive disorder).
• Do not use this code for active underdosing; refer to the "A" (initial encounter) or "D" (subsequent encounter) seventh characters for ongoing underdosing events.