S59.209K Unspecified physeal fracture of lower end of radius, unspecified arm, subsequent encounter for fracture with nonunion

Billable ICD-10-CM code, FY2026.

Built from S59.209 with 7th character K (subsequent encounter for fracture with nonunion).

Applies from S59 Other and unspecified injuries of elbow and forearm

Excludes2 (not included here)

• other and unspecified injuries of wrist and hand (S69.-)

7th character note

• The appropriate 7th character is to be added to each code from subcategories S59.0, S59.1, and S59.2

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 S59.209K

Back-references to S59.2

• Type 2 Excludes: S52.1 Fracture of upper end of radius ("physeal fractures of upper end of radius (S59.2-)")
• Type 2 Excludes: S52.5 Fracture of lower end of radius ("physeal fractures of lower end of radius (S59.2-)")

Nearby codes

• S59.202S Unspecified physeal fracture of lower end of radius, left arm, sequela
• S59.209 Unspecified physeal fracture of lower end of radius, unspecified arm
• S59.209A Unspecified physeal fracture of lower end of radius, unspecified arm, initial encounter for closed fracture
• S59.209D Unspecified physeal fracture of lower end of radius, unspecified arm, subsequent encounter for fracture with routine healing
• S59.209G Unspecified physeal fracture of lower end of radius, unspecified arm, subsequent encounter for fracture with delayed healing
• S59.209K Unspecified physeal fracture of lower end of radius, unspecified arm, subsequent encounter for fracture with nonunion (this code)
• S59.209P Unspecified physeal fracture of lower end of radius, unspecified arm, subsequent encounter for fracture with malunion
• S59.209S Unspecified physeal fracture of lower end of radius, unspecified arm, sequela
• S59.21 Salter-Harris Type I physeal fracture of lower end of radius
• S59.211 Salter-Harris Type I physeal fracture of lower end of radius, right arm
• S59.211A Salter-Harris Type I physeal fracture of lower end of radius, right arm, initial encounter for closed fracture