Underdosing of unsp nonopi analgs/antipyr/antirheu, init

This code signifies that a patient has intentionally or unintentionally taken less than the prescribed or recommended dose of a non-opioid pain reliever, fever reducer, or anti-inflammatory medication. This underdosing has resulted in a clinical issue or is being investigated as a potential cause of the patient's current symptoms.

Use this code when a patient presents with symptoms due to insufficient intake of an NSAID, acetaminophen, or other non-opioid analgesic, antipyretic, or antirheumatic drug, and the specific drug is not documented. This is appropriate for the initial encounter where the underdosing is first identified or treated.

• Always seek to identify the specific drug if possible to use a more precise code (e.g., T39.016XA for aspirin underdosing).
• This code is for underdosing, not for adverse effects from a correctly administered dose or poisoning.
• Ensure the "A" seventh character for initial encounter is appropriate; subsequent encounters would use "D" or "S".