Poisoning by other antihypertensive agents

This code signifies an adverse reaction or overdose resulting from the ingestion of antihypertensive medications other than those specifically classified elsewhere (e.g., ACE inhibitors, beta-blockers). It encompasses systemic toxic effects, whether accidental or intentional, due to these agents. The patient may present with symptoms such as hypotension, bradycardia, dizziness, or altered mental status.

Apply this code when documentation clearly indicates poisoning by an antihypertensive drug not specified by a more granular ICD-9-CM code. This includes medications like alpha-blockers (e.g., prazosin), central alpha-agonists (e.g., clonidine), or direct vasodilators (e.g., hydralazine). Supporting documentation should detail the specific drug involved (if known and not otherwise classified), the circumstances of the poisoning (accidental, intentional), and the resulting clinical manifestations.

• Always sequence this code after the appropriate E-code (E850-E869) to identify the external cause of poisoning.
• Do not use this code for adverse effects of correctly prescribed and administered antihypertensives; use an appropriate E-code for adverse effect and the manifestation code.
• Distinguish carefully between poisoning and therapeutic drug levels causing an adverse reaction; poisoning implies an overdose or toxic effect.