Other and unspecified injuries of ankle and foot
In Injuries to the ankle and foot (S90-S99), chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes
414 billable codes under S99: none are a CC or MCC; none map to an HCC.
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Instructional notes
Also applies, from Injuries to the ankle and foot (S90-S99)
These notes sit on S90-S99 and apply to every code under it, including S99.
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers 7th character use and coding of injuries, fractures, burns, drug and toxic effects, abuse and neglect, and complications of care (S00-T88).
- Application of 7th Characters in Chapter 19 (page 77)
- Coding of Injuries (page 78)
- Coding of Traumatic Fractures (page 79)
- Coding of Burns and Corrosions (page 80)
- Adverse Effects, Poisoning, Underdosing and Toxic Effects (page 82)
- Adult and child abuse, neglect and other maltreatment (page 85)
- Complications of care (page 85)
Codes under S99
S99 can't be used on a claim. Pick a billable code below; grey headings group them.
S99 MS-DRGs
As the principal diagnosis, the billable codes under S99 group to these 7 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 949 Aftercare with CC/MCC (228 of 414 codes)
- DRG 950 Aftercare without CC/MCC (228 of 414 codes)
- DRG 913 Traumatic Injury with MCC (186 of 414 codes)
- DRG 914 Traumatic Injury without MCC (186 of 414 codes)
- DRG 963 Other Multiple Significant Trauma with MCC (120 of 414 codes)
- DRG 964 Other Multiple Significant Trauma with CC (120 of 414 codes)
- DRG 965 Other Multiple Significant Trauma without CC/MCC (120 of 414 codes)
Other codes that refer to S99
Notes on these codes point to S99.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Ankle Injuries and Disorders
Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.
Read more about ankle injuries and disorders on MedlinePlusFoot Injuries and Disorders
Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems:
Read more about foot injuries and disorders on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.