Underdosing of phenothiazine antipsychot/neurolept, subs

This code signifies that a patient is receiving less than the prescribed or therapeutically required dose of a phenothiazine antipsychotic or neuroleptic medication, leading to an adverse health effect or exacerbation of their underlying condition. This underdosing is occurring during a follow-up visit for the problem.

Apply this code when a patient presents for ongoing management of a condition, and it's determined that their phenothiazine antipsychotic or neuroleptic medication regimen is insufficient, either due to patient non-compliance, medication error, or a deliberate reduction in dosage that is now causing issues. This would be used for subsequent encounters after the initial problem was identified.

• Always sequence this code after the code(s) for the specific mental health condition or other disorder being treated by the phenothiazine.
• Ensure documentation clearly indicates that the underdosing is impacting the patient's health and that this is not the initial encounter for the underdosing issue.
• Distinguish from poisoning or adverse effects from correct dosing; this code specifically addresses insufficient medication.