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2025 ICD-10-CM code T49.6X4S

Poisoning by otorhinolaryngological drugs and preparations, undetermined, sequela.

Use secondary code(s) from Chapter 20, External causes of morbidity (V01-Y98), to indicate the cause of injury. Use additional code to identify any retained foreign body, if applicable (Z18.-).

In simple words: This code represents the long-term effects of a poisoning incident involving ear, nose, and throat medications, where the specific drug is not known.

Poisoning by otorhinolaryngological drugs and preparations, undetermined, sequela. This code includes poisoning by, adverse effect of, and underdosing of glucocorticoids, topically used.

Example 1: A patient experiences a long-term loss of smell after using an unknown nasal spray several months prior., A patient develops chronic throat irritation following a past incident where they accidentally ingested an unidentified ear drop medication., A patient experiences permanent tinnitus after using a combination of ear, nose, and throat medications in the past, but the specific culprit cannot be determined.

Documentation should include details of the original poisoning incident, even if the specific drug is unknown. Any long-term effects or sequelae resulting from the poisoning should be clearly documented, along with the timeline of events.

** For adverse effects, code first the nature of the adverse effect. The drug giving rise to the adverse effect should be identified using codes from categories T36-T50 with fifth or sixth character 5. Use additional codes to specify manifestations of poisoning and underdosing.

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