Adverse effect of anthelminthics, initial encounter

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of an anthelminthic medication. These medications are used to treat parasitic worm infections, and the adverse effect is a direct consequence of the drug's intended action or an idiosyncratic reaction.

Apply this code when a patient presents with symptoms or conditions that are documented as an adverse effect from an anthelminthic drug, and this is the first time the patient is being seen for this specific adverse reaction. Examples include allergic reactions, gastrointestinal disturbances, or neurological symptoms directly attributed to the anthelminthic.

• Always code the specific manifestation of the adverse effect first, followed by this code.
• Ensure documentation clearly links the adverse effect to the anthelminthic medication.
• Verify that the encounter is indeed the "initial encounter" for this particular adverse effect.