Poisoning by therapeutic gases, undetermined, subs encntr

This code indicates a poisoning event due to therapeutic gases where the intent (accidental, intentional self-harm, assault) cannot be determined. This specific code is used for encounters following the initial treatment of the poisoning, such as follow-up appointments or management of lingering effects.

Apply this code when a patient presents for ongoing care related to a therapeutic gas poisoning, and the medical record does not specify whether the poisoning was accidental, intentional, or due to assault. Examples include follow-up for respiratory complications, neurological deficits, or other sequelae after the initial acute phase of poisoning.

• Always sequence this code after the primary diagnosis describing the specific manifestation of the poisoning.
• Ensure documentation clearly supports that the intent of the poisoning remains "undetermined" and that this is a "subsequent encounter."
• Do not use this code for the initial treatment of the poisoning; refer to the "A" or "D" encounter codes for initial care.