Adverse effect of systemic anti-infect/parasit, subs

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of a systemic anti-infective or antiparasitic medication not otherwise specified. The adverse effect is occurring during a follow-up visit for management or monitoring after the initial treatment of the adverse effect. This indicates the patient is still under active care for the drug-induced complication.

Apply this code when documenting a subsequent encounter for a patient experiencing an adverse effect from a systemic anti-infective or antiparasitic drug, such as a severe allergic reaction, organ toxicity, or other systemic side effect. This is appropriate when the patient is returning for ongoing treatment, monitoring, or evaluation of the adverse effect after the initial presentation and management.

• Always sequence the code for the specific manifestation of the adverse effect first, followed by this code.
• Ensure the medical record clearly documents that the adverse effect is from a systemic anti-infective or antiparasitic and that the encounter is subsequent.
• Verify that the drug causing the adverse effect is not specifically listed elsewhere in the T36-T50 range to avoid miscoding.