Underdosing of antitussives, subsequent encounter

This diagnosis code indicates that a patient has received an insufficient amount of an antitussive medication, leading to a suboptimal therapeutic effect, and this is being addressed during a follow-up visit. It signifies that the patient is not getting enough of the cough-suppressing drug as prescribed or needed.

Use this code when a patient presents for a follow-up appointment, and the healthcare provider determines that the patient's cough is poorly controlled due to underdosing of their prescribed antitussive. This could be due to patient non-compliance, incorrect dosage instructions, or a need for dose adjustment identified during a subsequent encounter.

• Always assign an additional code for the specific adverse effect or symptom (e.g., persistent cough, R05) that resulted from the underdosing.
• Ensure documentation clearly specifies "underdosing" and that the encounter is not the initial treatment for the underdosing event.
• Verify the antitussive medication involved is clearly documented to support the code.