Is T46.5X5 a billable ICD-10-CM code?

No. T46.5X5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T46.5X5 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 T46.5X5?

T46.5X5 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 T46.5X5 (T46) and apply to it just the same.

T46.5X5

T46.5X5 — Adverse effect of other antihypertensive drugs

Non-billable headerICD-10-CM

T46.5X5 is a non-billable header ICD-10-CM code for adverse effect 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

Excludes1 inherited from the categories above T46.5X5

These are not written on T46.5X5, but they bind it: a note on a category applies to every code beneath it. Billing T46.5X5 with anything listed here is a denial.

Written on T46 — Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system

poisoning by, adverse effect of and underdosing of metaraminol (T44.4)

Excludes2 inherited from the categories above T46.5X5

Also inherited, and the opposite of Excludes1: these conditions are not part of T46.5X5, but a patient can have both, so you may code both.

Written on T46.5 — Poisoning by, adverse effect of and underdosing of other antihypertensive drugs

poisoning by, adverse effect of and underdosing of beta-adrenoreceptor antagonists (T44.7)
poisoning by, adverse effect of and underdosing of calcium-channel blockers (T46.1)
poisoning by, adverse effect of and underdosing of diuretics (T50.0-T50.2)

Risk adjustment

T46.5X5 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

T46.5X5 has not changed since FY2024 — no addition, revision or deletion across the FY2024–FY2027 ICD-10-CM releases.

Code to one of these instead T46.5X5

3 child codes. Green means billable.

Related codes at this level

Codes that share T46.5X. If T46.5X5 is not quite right, the correct code is usually one of these.

Questions about T46.5X5

Is T46.5X5 a billable ICD-10-CM code?: No. T46.5X5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T46.5X5 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 T46.5X5?: T46.5X5 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 T46.5X5 (T46) and apply to it just the same.