T65.844A — Toxic effect of xylazine, undetermined, initial encounter

Billable

Is T65.844A billable?

Yes — T65.844A is billable for FY2027. T65.844A is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T65.844A may be submitted for encounters from October 1, 2026 through September 30, 2027.

T65.844A at a glance

Code	T65.844A
Description	Toxic effect of xylazine, undetermined, initial encounter
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027
7th character "A"	initial encounter

What does the 7th character "A" mean in T65.844A?

In T65.844A, the 7th character A means initial encounter. The 7th character is required for T65.844A to be a valid, complete code.

Same condition, different episode of care — switch the 7th character:

Which MS-DRGs does T65.844A group to?

T65.844A sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

917Poisoning and Toxic Effects of Drugs with MCCmedical
918Poisoning and Toxic Effects of Drugs without MCCmedical

Excludes1 — never code together — inherited from T51-T65

The conditions below can never be reported together with T65.844A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

contact with and (suspected) exposure to toxic substances (Z77.-)

Use additional code — inherited from Chapter 19

Report an additional code alongside T65.844A to fully describe the condition. T65.844A is sequenced first.

code to identify any retained foreign body, if applicable (Z18.-)

Use additional code — inherited from T51-T65

Report an additional code alongside T65.844A to fully describe the condition. T65.844A is sequenced first.

code(s):
for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
personal history of foreign body fully removed (Z87.821)
to identify any retained foreign body, if applicable (Z18.-)

Use additional code — inherited from T65.84

Report an additional code alongside T65.844A to fully describe the condition. T65.844A is sequenced first.

code(s) for all associated manifestations, such as:
cellulitis and acute lymphangitis (L03.-)
cutaneous abscess, furuncle and carbuncle (L02.-)
non-pressure chronic ulcer of lower limb, not elsewhere classified (L97.-)
non-pressure chronic ulcer of skin, not elsewhere classified (L98.4-)

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of T65.844A, but a patient may have both at the same time. When documentation supports it, T65.844A and the excluded code may both be reported.

birth trauma (P10-P15)
obstetric trauma (O70-O71)

How long has T65.844A existed?

T65.844A first appears in FY2026.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.