Adverse effect of digestants, initial encounter

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of a digestant medication. These reactions are not due to an overdose or poisoning, but rather an expected or unexpected side effect when the drug is administered correctly. The "initial encounter" indicates the patient is receiving active treatment for the adverse effect.

This code is appropriate when a patient presents with symptoms such as nausea, vomiting, abdominal pain, diarrhea, or allergic reactions directly attributable to a prescribed or over-the-counter digestant. It should be used when the patient is first seen for this specific adverse reaction and is undergoing evaluation or initial management.

• Always identify the specific digestant causing the adverse effect, if known, using an additional code from categories T36-T50.
• Distinguish between adverse effects (therapeutic use) and poisoning (incorrect use or overdose).
• Ensure the "initial encounter" seventh character is appropriate for the patient's current phase of care for this condition.