Is T36.AX4S a billable ICD-10-CM code?

Yes. T36.AX4S is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does T36.AX4S 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 T36.AX4S?

T36.AX4S 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 T36.AX4S (T36) and apply to it just the same.

T36.AX4S

T36.AX4S — Poisoning by fluoroquinolone antibiotics, undetermined, sequela

Billable / specific codeICD-10-CMPOA exempt

T36.AX4S is a billable, specific ICD-10-CM code for poisoning by fluoroquinolone antibiotics, undetermined, sequela. It is valid for submission on a claim.

7th character "S" — sequela

The appropriate 7th character is to be added to each code from category T36

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above T36.AX4S

These are not written on T36.AX4S, but they bind it: a note on a category applies to every code beneath it. Billing T36.AX4S with anything listed here is a denial.

Written on T36 — Poisoning by, adverse effect of and underdosing of systemic antibiotics

antineoplastic antibiotics (T45.1-)
locally applied antibiotic NEC (T49.0)
topically used antibiotic for ear, nose and throat (T49.6)
topically used antibiotic for eye (T49.5)

Risk adjustment

T36.AX4S 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.

Medicare coverage

T36.AX4S is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56948Billing and Coding: Lab: Cystatin C Measurement

Code history

What changed, and when. Derived by diffing consecutive CMS release files — which matters when you are defending a code assigned under an earlier edition.

addedFY2024-FY2027
Poisoning by fluoroquinolone antibiotics, undetermined, sequela

Related codes at this level

Codes that share T36.AX4. If T36.AX4S is not quite right, the correct code is usually one of these.

Questions about T36.AX4S

Is T36.AX4S a billable ICD-10-CM code?: Yes. T36.AX4S is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T36.AX4S 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 T36.AX4S?: T36.AX4S 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 T36.AX4S (T36) and apply to it just the same.