Undrdose of multiple unspecified drug/meds/biol subst, init

This code signifies that a patient has intentionally or unintentionally taken less than the prescribed or recommended dose of several different medications, biological substances, or other medicaments. This underdosing is causing a current clinical problem or is being investigated as a potential cause of a patient's symptoms. It indicates the initial phase of treatment for this specific underdosing event.

Apply this code when a patient presents with symptoms or conditions directly attributable to not taking enough of multiple different prescribed or over-the-counter substances. This includes situations where a patient deliberately reduces their dosage, forgets to take doses of various medications, or cannot afford to fill multiple prescriptions adequately. It is used for the first encounter related to this particular underdosing episode.

• Always sequence this code after the code(s) for the specific condition(s) being treated by the underdosed substances.
• Do not use this code if the underdosing is due to a single substance; a more specific code would apply.
• Ensure documentation clearly supports that multiple substances were underdosed and that this is the initial encounter for this specific event.