T46.5 — Poisoning by, adverse effect of and underdosing of other antihypertensive drugs
T46.5 is a non-billable header ICD-10-CM code for poisoning by, adverse effect of and underdosing of other antihypertensive drugs. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category T46
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
Excludes1 inherited from the categories above T46.5
These are not written on T46.5, but they bind it: a note on a category applies to every code beneath it. Billing T46.5 with anything listed here is a denial.
Other codes that can never be billed with T46.5
These codes carry an Excludes1 note pointing at T46.5. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T46.5 alone.
- T43.5Poisoning by, adverse effect of and underdosing of other and unspecified antipsychotics and neuroleptics
Risk adjustment
T46.5 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code history
T46.5 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Code to one of these instead T46.5
1 child code. Green means billable.
Related codes at this level
Codes that share T46. If T46.5 is not quite right, the correct code is usually one of these.
- T46.0Poisoning by, adverse effect of and underdosing of cardiac-stimulant glycosides and drugs of similar action
- T46.1Poisoning by, adverse effect of and underdosing of calcium-channel blockers
- T46.2Poisoning by, adverse effect of and underdosing of other antidysrhythmic drugs, not elsewhere classified
- T46.3Poisoning by, adverse effect of and underdosing of coronary vasodilators
- T46.4Poisoning by, adverse effect of and underdosing of angiotensin-converting-enzyme inhibitors
- T46.6Poisoning by, adverse effect of and underdosing of antihyperlipidemic and antiarteriosclerotic drugs
- T46.7Poisoning by, adverse effect of and underdosing of peripheral vasodilators
- T46.8Poisoning by, adverse effect of and underdosing of antivaricose drugs, including sclerosing agents
- T46.9Poisoning by, adverse effect of and underdosing of other and unspecified agents primarily affecting the cardiovascular system
Questions about T46.5
- Is T46.5 a billable ICD-10-CM code?
- No. T46.5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does T46.5 sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50).
- What cannot be coded together with T46.5?
- T46.5 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T46.5 (T46) and apply to it just the same.