Adverse effect of other opioids, initial encounter

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of an opioid medication other than heroin, natural opium alkaloids, or methadone. These adverse effects are unintended and can range in severity, occurring despite proper administration of the drug.

Apply this code when documenting the initial presentation of a patient experiencing an adverse effect from a prescribed or appropriately administered opioid like oxycodone, hydrocodone, fentanyl, or tramadol. This includes reactions such as severe nausea, constipation, respiratory depression, or allergic responses that are not due to poisoning or overdose.

• Always assign an additional code for the specific adverse effect (e.g., R11.2 for nausea and vomiting).
• Ensure the documentation clearly states the opioid was taken therapeutically, not for recreational use or overdose.
• This "initial encounter" seventh character is used for the period when the patient is receiving active treatment for the adverse effect.