Adverse effect of hydantoin derivatives, subs encntr

Adverse effect of hydantoin derivatives, subsequent encounter

📋Clinical Description

This code signifies a harmful or unintended reaction to a hydantoin derivative medication, such as phenytoin, that occurred during a follow-up visit. The patient is experiencing an adverse effect, not an accidental poisoning or underdosing.

🎯When to Use

Apply this code when a patient presents for ongoing management or evaluation of an adverse reaction to a hydantoin derivative, and the initial treatment for the adverse effect has already been provided. This is appropriate for subsequent visits related to the same adverse event.

💡Coding Tips

Always sequence this code after the code for the specific manifestation of the adverse effect.
Ensure documentation clearly states the reaction is an adverse effect, not poisoning or therapeutic error.
Verify the encounter is indeed "subsequent" and not the initial encounter for the adverse effect.

AI-generated reference — verify against official guidelines

Code Hierarchy

▲T42.0X5Adverse effect of hydantoin derivatives

T42.0X5D(current)

Crosswalks

V58.89ApproxICD-9

Same Category

T42Antiepileptic, sedative- hypnotic and antiparkinsonism drugs T42.0Hydantoin derivatives T42.0XHydantoin derivatives T42.0X1Poisoning by hydantoin derivatives, accidental T42.0X1APoisoning by hydantoin derivatives, accidental, init