Adverse effect of cocaine, subsequent encounter

This code indicates a patient is experiencing an unintended and undesirable reaction to cocaine, which is being addressed during a follow-up visit. The adverse effect is not due to poisoning, overdose, or improper use, but rather a normal physiological response to the drug. This could include symptoms like tachycardia, anxiety, or hypertension occurring after initial treatment.

Apply this code when a patient presents for ongoing management or evaluation of an adverse effect from cocaine use, after the initial encounter for the adverse effect has already taken place. This is appropriate for situations where the patient is returning for monitoring, further treatment, or assessment of resolution of the adverse reaction.

• Always sequence this code after the code for the specific adverse effect (e.g., R00.0 for tachycardia).
• Ensure documentation clearly states the adverse effect is due to cocaine and that this is a subsequent encounter.
• Distinguish from poisoning (T40.5X1-), underdosing (T40.5X6-), or toxic effect (T40.5X4-).