Adverse effect of other hormone antagonists, init encntr

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of a hormone antagonist medication, excluding those with more specific ICD-10-CM codes. This reaction is not an overdose, poisoning, or underdosing, but rather an expected or unexpected side effect of a correctly administered drug.

Apply this code when documenting the initial encounter for a patient presenting with an adverse effect from a hormone antagonist, such as an antiandrogen or antiestrogen, that is not otherwise specified. Examples include hot flashes, nausea, or fatigue directly attributable to the medication. This code is appropriate when the intent was therapeutic and the drug was administered correctly.

• Always sequence this code after the code for the specific adverse effect (e.g., R11.0 for nausea).
• Ensure the documentation clearly states the reaction is an "adverse effect" and not a poisoning or overdose.
• Verify the medication involved is indeed a hormone antagonist and not another class of drug.