Undrdose & nonadmin of necess drug, medicament or biolg sub

This code signifies a patient's failure to receive a prescribed medication, either due to underdosing (receiving less than the prescribed amount) or complete nonadministration. This can lead to a worsening of the patient's condition or a lack of expected therapeutic effect.

Use this code when documentation clearly indicates that a patient did not take or was not given a necessary drug, medicament, or biological substance as prescribed. This includes situations where a patient intentionally or unintentionally takes less than the recommended dose, or when a medication is entirely omitted.

• Always sequence this code as a secondary diagnosis, identifying the adverse effect or condition resulting from the underdosing/nonadministration as the primary diagnosis.
• Ensure documentation specifies the drug involved and the impact of the underdosing or nonadministration on the patient's health.
• Distinguish this from adverse effects of correctly administered drugs (T36-T50 with 5th or 6th character 5) or poisoning (T36-T50 with 5th or 6th character 1-4).