Underdosing of expectorants, sequela

This code indicates a long-term or residual condition resulting from the insufficient administration of an expectorant medication. This underdosing led to a persistent health issue, such as chronic respiratory congestion or recurrent infections, that is directly attributable to the original inadequate treatment.

Apply this code when documentation clearly links a current, ongoing medical problem to a past instance where an expectorant was not given in sufficient quantity or frequency. This is appropriate for conditions that have stabilized but continue to manifest symptoms or complications due to the prior underdosing.

• Always sequence this code after the code for the specific sequela (e.g., chronic bronchitis, persistent cough).
• Ensure the medical record explicitly states the underdosing of an expectorant as the cause of the current condition.
• This "S" seventh character indicates sequela and should only be used for conditions that are residual effects, not acute events.