S85.171A — Laceration of posterior tibial artery, right leg, initial encounter
Is S85.171A billable?
Yes — S85.171A is billable for FY2027. S85.171A is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. S85.171A may be submitted for encounters from October 1, 2026 through September 30, 2027.
S85.171A at a glance
| Code | S85.171A |
|---|---|
| Description | Laceration of posterior tibial artery, right leg, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in S85.171A?
In S85.171A, the 7th character A means initial encounter. The 7th character is required for S85.171A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does S85.171A group to?
S85.171A sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 913Traumatic Injury with MCCmedical
- 914Traumatic Injury without MCCmedical
As a secondary diagnosis, S85.171A is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is S85.171A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S85.17, the nearest indexed parent of S85.171A. Use them to find the family, then select the specific code.
- Injury › blood vessel NEC › tibial artery › posterior › laceration
Use additional code — inherited from Chapter 19
Report an additional code alongside S85.171A to fully describe the condition. S85.171A is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of S85.171A, but a patient may have both at the same time. When documentation supports it, S85.171A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S80-S89
The conditions below are not part of S85.171A, but a patient may have both at the same time. When documentation supports it, S85.171A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S85
The conditions below are not part of S85.171A, but a patient may have both at the same time. When documentation supports it, S85.171A and the excluded code may both be reported.
- injury of blood vessels at ankle and foot level (S95.-)
Code also — inherited from S85
Two codes may be needed to describe the condition fully. Whether S85.171A is sequenced first depends on the reason for the encounter.
- any associated open wound (S81.-)
How long has S85.171A existed?
S85.171A has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.