Poisn by unsp drugs aff the autonm nervous sys, undet, subs

This code signifies a poisoning event involving an unknown drug that primarily impacts the autonomic nervous system. The intent of the poisoning (e.g., accidental, intentional self-harm) cannot be determined. This specific code is used for encounters following the initial treatment of the poisoning.

Apply this code when a patient presents for follow-up care, such as monitoring for lingering effects or managing complications, after an initial poisoning by an unidentifiable autonomic nervous system-affecting drug. The medical record must clearly indicate that the intent of the poisoning remains undetermined. This code is appropriate when the initial acute phase of treatment has concluded.

• Always assign a T-code for poisoning as the primary diagnosis, followed by codes for any associated manifestations or complications.
• Ensure the documentation explicitly states "undetermined" intent for the poisoning. If the intent is known (e.g., accidental, intentional), a different 6th character would be used.
• Verify that this is a subsequent encounter (7th character "D") and not an initial encounter ("A") or sequela ("S").