S99.121K — Salter-Harris Type II physeal fracture of right metatarsal, subsequent encounter for fracture with nonunion
Is S99.121K billable?
Yes — S99.121K is billable for FY2027. S99.121K is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. S99.121K may be submitted for encounters from October 1, 2026 through September 30, 2027.
S99.121K at a glance
| Code | S99.121K |
|---|---|
| Description | Salter-Harris Type II physeal fracture of right metatarsal, subsequent encounter for fracture with nonunion |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "K" | subsequent encounter for fracture with nonunion |
What does the 7th character "K" mean in S99.121K?
In S99.121K, the 7th character K means subsequent encounter for fracture with nonunion. The 7th character is required for S99.121K to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
- Ainitial encounter for closed fractureS99.121A
- Binitial encounter for open fractureS99.121B
- Dsubsequent encounter for fracture with routine healingS99.121D
- Gsubsequent encounter for fracture with delayed healingS99.121G
- Ksubsequent encounter for fracture with nonunionS99.121K
- Psubsequent encounter for fracture with malunionS99.121P
- SsequelaS99.121S
Which MS-DRGs does S99.121K group to?
S99.121K 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 S99.121K listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S99.12, the nearest indexed parent of S99.121K. Use them to find the family, then select the specific code.
- Fracture, traumatic › metatarsal bone › physeal › Salter-Harris › Type II (abduction) (adduction) (separation)
Use additional code — inherited from Chapter 19
Report an additional code alongside S99.121K to fully describe the condition. S99.121K 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 S99.121K, but a patient may have both at the same time. When documentation supports it, S99.121K and the excluded code may both be reported.
Excludes2 — not included here — inherited from S90-S99
The conditions below are not part of S99.121K, but a patient may have both at the same time. When documentation supports it, S99.121K and the excluded code may both be reported.
How long has S99.121K existed?
S99.121K first appears in FY2018 (FY2017 is not available, so it may have appeared then).
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.