S88.929A — Partial traumatic amputation of unspecified lower leg, level unspecified, initial encounter
Is S88.929A billable?
Yes, but S88.929A will trip a Medicare edit. S88.929A is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, CMS lists S88.929A under Medicare Code Editor edit 20, “Unspecified code” — meaning a code specifying laterality (right, left or bilateral) exists in the same family. On an inpatient claim this triggers the edit, because CMS holds that there are very limited circumstances in which laterality cannot be documented.
S88.929A at a glance
| Code | S88.929A |
|---|---|
| Description | Partial traumatic amputation of unspecified lower leg, level unspecified, 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 S88.929A?
In S88.929A, the 7th character A means initial encounter. The 7th character is required for S88.929A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
What Medicare edits apply to S88.929A?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name S88.929A directly.
A code specifying laterality (right, left or bilateral) exists in the same family. CMS holds that there are very limited circumstances in which laterality cannot be documented.
Which MS-DRGs does S88.929A group to?
S88.929A 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, S88.929A is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is S88.929A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S88.92, the nearest indexed parent of S88.929A. Use them to find the family, then select the specific code.
- Amputation › traumatic › leg › partial
Excludes1 — never code together — inherited from S88
The conditions below can never be reported together with S88.929A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- traumatic amputation of ankle and foot (S98.-)
Use additional code — inherited from Chapter 19
Report an additional code alongside S88.929A to fully describe the condition. S88.929A 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 S88.929A, but a patient may have both at the same time. When documentation supports it, S88.929A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S80-S89
The conditions below are not part of S88.929A, but a patient may have both at the same time. When documentation supports it, S88.929A and the excluded code may both be reported.
How long has S88.929A existed?
S88.929A 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.