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

This code signifies that a patient has experienced an adverse effect due to taking less than the prescribed or recommended dose of several different, unidentified medications, biological substances, or other medicaments. This underdosing event is occurring during a follow-up visit for the condition caused by the insufficient dosage.

Use this code when a patient presents for ongoing management of a condition that resulted from the underdosing of multiple, unspecified substances. This applies to situations where the specific drugs involved are not documented or are unknown, and the encounter is not the initial treatment for the underdosing effect.

• Always sequence this code after the code(s) for the specific condition(s) resulting from the underdosing.
• Only use the "D" seventh character for subsequent encounters after the initial treatment for the underdosing effect.
• Avoid using this code if the specific drugs involved in the underdosing are known; instead, use more specific codes from categories T36-T50 with the appropriate underdosing subclassification.