Underdosing of salicylates, initial encounter

This code indicates that a patient has experienced adverse effects due to taking less than the prescribed or recommended dose of a salicylate medication. This underdosing has led to a worsening of the condition the salicylate was intended to treat, or to the development of new symptoms directly attributable to insufficient drug levels.

Use this code when documentation clearly states that a patient's condition is exacerbated or new symptoms arise because they did not take enough aspirin or other salicylate. This often occurs when a patient self-adjusts their medication, forgets doses, or misunderstands dosing instructions, leading to subtherapeutic drug levels.

• Always look for explicit documentation of "underdosing" and the specific drug class (salicylate).
• Ensure the encounter is the "initial" one for this specific underdosing event. Subsequent encounters would use the appropriate seventh character.
• Code the specific condition or symptom that resulted from the underdosing as the primary diagnosis, with this code as a secondary diagnosis.