Underdosing of selective serotonin reuptake inhibitors, init

This code signifies a patient experiencing adverse effects or a lack of therapeutic response due to receiving an insufficient dose of a selective serotonin reuptake inhibitor (SSRI). This could be due to patient non-adherence, a prescribing error, or issues with medication administration. The "initial encounter" indicates this is the first time the underdosing is being addressed by a healthcare provider.

Apply this code when a patient presents with worsening depression, anxiety, or other conditions treated by SSRIs, and the clinical assessment confirms the current SSRI dosage is below the therapeutic level or the patient is not taking the prescribed amount. This is appropriate for the initial visit where the underdosing is identified and treatment adjustments are planned.

• Always sequence this code after the primary diagnosis for which the SSRI was prescribed (e.g., major depressive disorder).
• Ensure documentation clearly specifies "underdosing" and identifies the medication as an SSRI.
• The "A" seventh character indicates an active phase of treatment for the underdosing; use subsequent characters for follow-up encounters.