S59.099K Other physeal fracture of lower end of ulna, unspecified arm, subsequent encounter for fracture with nonunion

Billable ICD-10-CM code, FY2026.

Built from S59.099 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.

Nearby codes

• S59.092S Other physeal fracture of lower end of ulna, left arm, sequela
• S59.099 Other physeal fracture of lower end of ulna, unspecified arm
• S59.099A Other physeal fracture of lower end of ulna, unspecified arm, initial encounter for closed fracture
• S59.099D Other physeal fracture of lower end of ulna, unspecified arm, subsequent encounter for fracture with routine healing
• S59.099G Other physeal fracture of lower end of ulna, unspecified arm, subsequent encounter for fracture with delayed healing
• S59.099K Other physeal fracture of lower end of ulna, unspecified arm, subsequent encounter for fracture with nonunion (this code)
• S59.099P Other physeal fracture of lower end of ulna, unspecified arm, subsequent encounter for fracture with malunion
• S59.099S Other physeal fracture of lower end of ulna, unspecified arm, sequela
• S59.1 Physeal fracture of upper end of radius
• S59.10 Unspecified physeal fracture of upper end of radius
• S59.101 Unspecified physeal fracture of upper end of radius, right arm