Underdosing of MAO inhib antidepressants, sequela

This code indicates that a patient has experienced a long-term or residual effect resulting from taking less than the prescribed or recommended dose of a monoamine oxidase inhibitor (MAOI) antidepressant. This underdosing could lead to persistent or recurrent depressive symptoms, or other adverse sequelae due to insufficient therapeutic effect.

Use this code when documenting a patient's current condition or symptom that is a direct consequence of historical underdosing of an MAOI antidepressant. This is appropriate for follow-up visits where the long-term impact of the underdosing is being managed, rather than the acute underdosing event itself.

• Requires a secondary code to identify the specific sequela (e.g., recurrent major depressive disorder).
• Only use for conditions that are a direct, lasting result of the underdosing, not for the acute event.
• Distinguish from poisoning (T43.1X1-T43.1X4) or adverse effect (T43.1X5-).