S89.099K Other physeal fracture of upper end of unspecified tibia, subsequent encounter for fracture with nonunion

Billable ICD-10-CM code, FY2026.

Built from S89.099 with 7th character K (subsequent encounter for fracture with nonunion).

Applies from S89 Other and unspecified injuries of lower leg

Excludes2 (not included here)

• other and unspecified injuries of ankle and foot (S99.-)

7th character note

• The appropriate 7th character is to be added to each code from subcategories S89.0, S89.1, S89.2, and S89.3

Notes

• A fracture not indicated as open or closed should be coded to closed

7th character required

• A — initial encounter for closed fracture
• D — subsequent encounter for fracture with routine healing
• G — subsequent encounter for fracture with delayed healing
• K — subsequent encounter for fracture with nonunion
• P — subsequent encounter for fracture with malunion
• S — sequela

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to S89.099K

Back-references to S89.0

• Type 2 Excludes: S82.1 Fracture of upper end of tibia ("physeal fracture of upper end of tibia (S89.0-)")

Back-references to S89

• Type 2 Excludes: M23 Internal derangement of knee ("current injury - see injury of knee and lower leg (S80-S89)")

Nearby codes

• S89.092S Other physeal fracture of upper end of left tibia, sequela
• S89.099 Other physeal fracture of upper end of unspecified tibia
• S89.099A Other physeal fracture of upper end of unspecified tibia, initial encounter for closed fracture
• S89.099D Other physeal fracture of upper end of unspecified tibia, subsequent encounter for fracture with routine healing
• S89.099G Other physeal fracture of upper end of unspecified tibia, subsequent encounter for fracture with delayed healing
• S89.099K Other physeal fracture of upper end of unspecified tibia, subsequent encounter for fracture with nonunion (this code)
• S89.099P Other physeal fracture of upper end of unspecified tibia, subsequent encounter for fracture with malunion
• S89.099S Other physeal fracture of upper end of unspecified tibia, sequela
• S89.1 Physeal fracture of lower end of tibia
• S89.10 Unspecified physeal fracture of lower end of tibia
• S89.101 Unspecified physeal fracture of lower end of right tibia