Underdosing of drug/meds/biol subst, subs

This code signifies a patient's condition resulting from taking less than the prescribed or recommended amount of a drug, medicament, or biological substance, excluding those with more specific underdosing codes. It indicates that the patient is currently receiving active treatment for the underdosing event, or has experienced a complication that requires ongoing care.

Use this code when documenting a patient encounter for the sequelae of underdosing a medication not otherwise specified, and the encounter is for follow-up care, a complication, or continued treatment related to the initial underdosing. This could include situations where a patient did not take enough of their antidepressant, blood pressure medication, or other prescribed drug, leading to a worsening of their condition or new symptoms.

• Always assign an additional code for the specific drug or substance underdosed (from T36-T50 with the 6th character '6').
• Also, code the specific manifestation or adverse effect of the underdosing.
• The 7th character 'D' indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.