S62.509K Fracture of unspecified phalanx of unspecified thumb, subsequent encounter for fracture with nonunion

Billable ICD-10-CM code, FY2026.

Built from S62.509 with 7th character K (subsequent encounter for fracture with nonunion).

Applies from S62 Fracture at wrist and hand level

Excludes1 (never code together)

• traumatic amputation of wrist and hand (S68.-)

Excludes2 (not included here)

• fracture of distal parts of ulna and radius (S52.-)

7th character note

• The appropriate 7th character is to be added to each code from category S62

Notes

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

7th character required

• A — initial encounter for closed fracture
• B — initial encounter for open 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 S62.509K

Back-references to S62.5

• Type 2 Excludes: S62.6 Fracture of other and unspecified finger(s) ("fracture of thumb (S62.5-)")

Back-references to S62

• Type 1 Excludes: M84.3 Stress fracture ("traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)")
• Type 1 Excludes: M84.4 Pathological fracture, not elsewhere classified ("traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)")
• Type 2 Excludes: S52 Fracture of forearm ("fracture at wrist and hand level (S62.-)")
• Type 1 Excludes: S61 Open wound of wrist, hand and fingers ("open fracture of wrist, hand and finger (S62.- with 7th character B)")
• Use Additional: S67 Crushing injury of wrist, hand and fingers ("fracture of wrist and hand (S62.-)")

Nearby codes

• S62.509 Fracture of unspecified phalanx of unspecified thumb
• S62.509A Fracture of unspecified phalanx of unspecified thumb, initial encounter for closed fracture
• S62.509B Fracture of unspecified phalanx of unspecified thumb, initial encounter for open fracture
• S62.509D Fracture of unspecified phalanx of unspecified thumb, subsequent encounter for fracture with routine healing
• S62.509G Fracture of unspecified phalanx of unspecified thumb, subsequent encounter for fracture with delayed healing
• S62.509K Fracture of unspecified phalanx of unspecified thumb, subsequent encounter for fracture with nonunion (this code)
• S62.509P Fracture of unspecified phalanx of unspecified thumb, subsequent encounter for fracture with malunion
• S62.509S Fracture of unspecified phalanx of unspecified thumb, sequela
• S62.51 Fracture of proximal phalanx of thumb
• S62.511 Displaced fracture of proximal phalanx of right thumb
• S62.511A Displaced fracture of proximal phalanx of right thumb, initial encounter for closed fracture