S89.399K
✓ Billable
Other physeal fracture of lower end of unspecified fibula, subsequent encounter for fracture with nonunion
ICD-10-CM · FY2026 · Injury, Poisoning and Certain Other Consequences of External Causes
Code
S89.399K
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Injury, Poisoning and Certain Other Consequences of External Causes
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code S89.399K?
ICD-10-CM code S89.399K represents Other physeal fracture of lower end of unspecified fibula, subsequent encounter for fracture with nonunion. It is a billable diagnosis code in the Injury, Poisoning and Certain Other Consequences of External Causes chapter, effective October 1, 2025 – September 30, 2026.
Is S89.399K billable?
Yes. S89.399K is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is S89.399K in?
S89.399K belongs to the Injury, Poisoning and Certain Other Consequences of External Causes chapter (S00–T88) of ICD-10-CM.
Related codes in the S89 category
S89
Other and unspecified injuries of lower leg
Non-billable
S89.0
Physeal fracture of upper end of tibia
Non-billable
S89.1
Physeal fracture of lower end of tibia
Non-billable
S89.2
Physeal fracture of upper end of fibula
Non-billable
S89.3
Physeal fracture of lower end of fibula
Non-billable
S89.8
Other specified injuries of lower leg
Non-billable
S89.9
Unspecified injury of lower leg
Non-billable
S89.00
Unspecified physeal fracture of upper end of tibia
Non-billable
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