MCMCB Pro
T63.313S

T63.313SToxic effect of venom of black widow spider, assault, sequela

Billable / specific codeICD-10-CMPOA exempt

T63.313S is a billable, specific ICD-10-CM code for toxic effect of venom of black widow spider, assault, 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 T63

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

T63.313S 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

T63.313S is named in 5 Medicare coverage policies 5 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A56559Billing and Coding: Allergy Skin Testing
  • A56559Billing and Coding: Allergy Skin Testing
  • A56612Billing and Coding: CT of the Head
  • A56844Billing and Coding: RAST Type Tests

Related codes at this level

Codes that share T63.313. If T63.313S is not quite right, the correct code is usually one of these.

Questions about T63.313S

Is T63.313S a billable ICD-10-CM code?
Yes. T63.313S is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T63.313S 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.