Poisoning by oth antihypertensive drugs, undetermined, subs

This code signifies a poisoning event involving antihypertensive medications other than those specifically classified elsewhere, where the intent (accidental, intentional self-harm, assault) cannot be determined. The patient is receiving active treatment for the effects of the poisoning, or has experienced a complication from the poisoning during this encounter.

Apply this code when a patient presents for follow-up care, or for treatment of a complication, related to an undetermined poisoning by an antihypertensive drug (e.g., a calcium channel blocker or ACE inhibitor not otherwise specified). This is appropriate when the initial acute phase of treatment for the poisoning is over, but ongoing care is required.

• Always sequence this code after the primary diagnosis for the specific manifestation of the poisoning (e.g., hypotension, arrhythmia).
• Ensure the "undetermined" intent is clearly documented in the medical record.
• Verify that the encounter is for subsequent care related to the poisoning, not the initial acute treatment.