Adverse effect of aspirin, initial encounter

This code signifies a patient experiencing an unintended and undesirable reaction to aspirin when it was administered correctly and at a therapeutic dose. This adverse effect is occurring for the first time or is the initial presentation of a new episode of an adverse effect.

Apply this code when documenting conditions such as aspirin-induced gastritis, tinnitus, or allergic reactions (e.g., rash, angioedema) that are directly attributable to the therapeutic use of aspirin. This is appropriate for the initial hospital admission or encounter for the adverse event.

• Always sequence this code first if the adverse effect is the primary reason for the encounter.
• Remember to also code the specific manifestation of the adverse effect (e.g., K29.70 for aspirin-induced gastritis).
• Ensure documentation clearly states the reaction is an "adverse effect" rather than poisoning, underdosing, or noncompliance.