Adverse effect of antithrombotic drugs, subsequent encounter

This code signifies a patient experiencing an unintended and undesirable reaction to a medication prescribed to prevent or treat blood clots, and this encounter is for follow-up care after the initial treatment of the adverse effect. The patient is no longer in the acute phase of treatment for the adverse effect but is still receiving care related to it.

Apply this code when a patient presents for ongoing management, monitoring, or evaluation of an adverse effect from an antithrombotic drug, and the initial treatment for that adverse effect has already been provided. Examples include follow-up appointments for persistent bleeding, organ damage, or other complications directly attributed to the antithrombotic medication.

• Always sequence the code for the specific adverse effect (e.g., hemorrhage, thrombocytopenia) first, followed by this code.
• Ensure documentation clearly indicates the encounter is for follow-up care of the adverse effect, not the initial treatment.
• Verify the medication causing the adverse effect is an antithrombotic agent (e.g., warfarin, heparin, direct oral anticoagulants).