MCMCB Pro
T25.731A

T25.731ACorrosion of third degree of right toe(s) (nail), initial encounter

Billable / specific codeICD-10-CMright

T25.731A is a billable, specific ICD-10-CM code for corrosion of third degree of right toe(s) (nail), 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 T25

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

T25.731A 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

T25.731A 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.

  • A52438Billing and Coding: Tetanus Immunization
  • A52998Billing and Coding: Surgical Treatment of Nails
  • A53058Billing and Coding: Home Health Physical Therapy
  • A53065Billing and Coding: Outpatient Physical Therapy

Related codes at this level

Codes that share T25.731. If T25.731A is not quite right, the correct code is usually one of these.

Questions about T25.731A

Is T25.731A a billable ICD-10-CM code?
Yes. T25.731A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T25.731A sit in the tabular list?
Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Burns and corrosions of external body surface, specified by site (T20-T25).
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.