MCMCB Pro
T50.996A

T50.996AUnderdosing of other drugs, medicaments and biological substances, initial encounter

Billable / specific codeICD-10-CM

T50.996A is a billable, specific ICD-10-CM code for underdosing of other drugs, medicaments and biological substances, 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 T50

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

T50.996A 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

T50.996A 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.

  • A56645Billing and Coding: Controlled Substance Monitoring and Drugs of Abuse Testing

Related codes at this level

Codes that share T50.996. If T50.996A is not quite right, the correct code is usually one of these.

Questions about T50.996A

Is T50.996A a billable ICD-10-CM code?
Yes. T50.996A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T50.996A 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.