Encounter for therapeutic drug level monitoring

This code signifies a patient encounter specifically for the purpose of monitoring the concentration of a therapeutic drug in their system. The goal is to ensure the drug level is within a safe and effective range, optimizing treatment outcomes and minimizing adverse effects. This monitoring is distinct from diagnostic testing for suspected drug toxicity or substance abuse.

Apply this code when a patient presents for a blood draw or other specimen collection solely to assess the therapeutic level of a prescribed medication. This is common for drugs with a narrow therapeutic index, such as anticonvulsants, antiarrhythmics, or immunosuppressants. It should be used when the primary reason for the visit is the drug level check, not for managing an acute condition.

• Always sequence this code as a secondary diagnosis when the underlying condition requiring the medication is also being addressed.
• Do not use this code for drug screens performed for employment, legal, or other administrative purposes.
• Ensure documentation clearly states the intent of the encounter is for therapeutic drug level monitoring.