MCMCB Pro
S85.172A

S85.172ALaceration of posterior tibial artery, left leg, initial encounter

Billable / specific codeICD-10-CMleft

S85.172A is a billable, specific ICD-10-CM code for laceration of posterior tibial artery, left leg, 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 S85

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

S85.172A 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

S85.172A is named in 12 Medicare coverage policies 12 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A56697Billing and Coding: Non-Invasive Vascular Studies
  • A56697Billing and Coding: Non-Invasive Vascular Studies
  • A56747Billing and Coding: Magnetic Resonance Angiography (MRA)
  • A56758Billing and Coding: Non-Invasive Vascular Studies

Related codes at this level

Codes that share S85.172. If S85.172A is not quite right, the correct code is usually one of these.

Questions about S85.172A

Is S85.172A a billable ICD-10-CM code?
Yes. S85.172A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does S85.172A sit in the tabular list?
Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the knee and lower leg (S80-S89).
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.