S86.391A — Other injury of muscle(s) and tendon(s) of peroneal muscle group at lower leg level, right leg, initial encounter
Is S86.391A billable?
Yes — S86.391A is billable for FY2027. S86.391A is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. S86.391A may be submitted for encounters from October 1, 2026 through September 30, 2027.
S86.391A at a glance
| Code | S86.391A |
|---|---|
| Description | Other injury of muscle(s) and tendon(s) of peroneal muscle group at lower leg level, 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 S86.391A?
In S86.391A, the 7th character A means initial encounter. The 7th character is required for S86.391A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does S86.391A group to?
S86.391A 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
How is S86.391A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S86.39, the nearest indexed parent of S86.391A. Use them to find the family, then select the specific code.
- Injury › muscle › peroneal muscle group, at leg level › specified type NEC
Use additional code — inherited from Chapter 19
Report an additional code alongside S86.391A to fully describe the condition. S86.391A 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 S86.391A, but a patient may have both at the same time. When documentation supports it, S86.391A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S80-S89
The conditions below are not part of S86.391A, but a patient may have both at the same time. When documentation supports it, S86.391A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S86
The conditions below are not part of S86.391A, but a patient may have both at the same time. When documentation supports it, S86.391A and the excluded code may both be reported.
Code also — inherited from S86
Two codes may be needed to describe the condition fully. Whether S86.391A is sequenced first depends on the reason for the encounter.
- any associated open wound (S81.-)
How long has S86.391A existed?
S86.391A 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.