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T40.0X3A

T40.0X3APoisoning by opium, assault, initial encounter

Billable / specific codeICD-10-CM

T40.0X3A is a billable, specific ICD-10-CM code for poisoning by opium, assault, initial encounter. It is valid for submission on a claim.

7th character "A" — initial encounter

The appropriate 7th character is to be added to each code from category T40

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

T40.0X3A 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

T40.0X3A is named in 13 Medicare coverage policies 13 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A54799Billing and Coding: Urine Drug Testing
  • A55001Billing and Coding: Urine Drug Testing
  • A56500Billing and Coding: Cardiac Catheterization and Coronary Angiography
  • A56612Billing and Coding: CT of the Head

Related codes at this level

Codes that share T40.0X3. If T40.0X3A is not quite right, the correct code is usually one of these.

Questions about T40.0X3A

Is T40.0X3A a billable ICD-10-CM code?
Yes. T40.0X3A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T40.0X3A 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).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.