Adverse effect of MAO inhib antidepressants, init

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of a monoamine oxidase inhibitor (MAOI) antidepressant. These adverse effects can range from mild to severe and are a direct consequence of the drug's intended action or an idiosyncratic response. This specific code is used for the very first time the patient presents for treatment of this adverse effect.

Apply this code when a patient presents to a healthcare provider with symptoms or conditions directly attributable to an MAOI antidepressant they are currently taking or have recently taken, and this is their initial visit for this specific adverse reaction. Examples include hypertensive crisis, serotonin syndrome, or severe orthostatic hypotension linked to MAOI use. It is appropriate for the initial evaluation and management of the adverse effect.

• Always sequence this code after the code for the specific manifestation of the adverse effect (e.g., R55 for syncope, I10 for essential hypertension).
• Ensure documentation clearly states the MAOI as the causative agent and that the encounter is for the initial treatment of the adverse effect.
• Do not use this code for poisoning, underdosing, or toxic effects where the MAOI was not taken as prescribed.