MCMCB Pro
T63.464A

T63.464AToxic effect of venom of wasps, undetermined, initial encounter

Billable / specific codeICD-10-CM

T63.464A is a billable, specific ICD-10-CM code for toxic effect of venom of wasps, undetermined, 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 T63

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

T63.464A 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

T63.464A is named in 18 Medicare coverage policies 18 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A56538Billing and Coding: Allergen Immunotherapy
  • A56538Billing and Coding: Allergen Immunotherapy
  • A56558Billing and Coding: Allergy Testing
  • A56612Billing and Coding: CT of the Head

Related codes at this level

Codes that share T63.464. If T63.464A is not quite right, the correct code is usually one of these.

Questions about T63.464A

Is T63.464A a billable ICD-10-CM code?
Yes. T63.464A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T63.464A sit in the tabular list?
Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Toxic effects of substances chiefly nonmedicinal as to source (T51-T65).
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.