S99.911D — Unspecified injury of right ankle, subsequent encounter
Is S99.911D billable?
Yes, but S99.911D is an unspecified code. S99.911D is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, S99.911D is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting S99.911D.
S99.911D at a glance
| Code | S99.911D |
|---|---|
| Description | Unspecified injury of right ankle, subsequent encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "D" | subsequent encounter |
What does the 7th character "D" mean in S99.911D?
In S99.911D, the 7th character D means subsequent encounter. The 7th character is required for S99.911D to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does S99.911D group to?
S99.911D sits in MDC 23 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.
- 949Aftercare with CC/MCCmedical
- 950Aftercare without CC/MCCmedical
How is S99.911D listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S99.91, the nearest indexed parent of S99.911D. Use them to find the family, then select the specific code.
- Injury › ankle
Use additional code — inherited from Chapter 19
Report an additional code alongside S99.911D to fully describe the condition. S99.911D 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 S99.911D, but a patient may have both at the same time. When documentation supports it, S99.911D and the excluded code may both be reported.
Excludes2 — not included here — inherited from S90-S99
The conditions below are not part of S99.911D, but a patient may have both at the same time. When documentation supports it, S99.911D and the excluded code may both be reported.
How long has S99.911D existed?
S99.911D 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.