S52.509R Unspecified fracture of the lower end of unspecified radius, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion
Billable ICD-10-CM code, FY2026.
Built from S52.509 with 7th character R (subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion).
Applies from S52 Fracture of forearm
Excludes1 (never code together)
traumatic amputation of forearm (S58.-)
Excludes2 (not included here)
fracture at wrist and hand level (S62.-)
periprosthetic fracture around internal prosthetic elbow joint (M97.4)
7th character note
The appropriate 7th character is to be added to all codes from category S52
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
The open fracture designations are based on the Gustilo open fracture classification
7th character required
A — initial encounter for closed fracture
B — initial encounter for open fracture type I or II
C — initial encounter for open fracture type IIIA, IIIB, or IIIC
D — subsequent encounter for closed fracture with routine healing
E — subsequent encounter for open fracture type I or II with routine healing
F — subsequent encounter for open fracture type IIIA, IIIB, or IIIC with routine healing
G — subsequent encounter for closed fracture with delayed healing
H — subsequent encounter for open fracture type I or II with delayed healing
J — subsequent encounter for open fracture type IIIA, IIIB, or IIIC with delayed healing
K — subsequent encounter for closed fracture with nonunion
M — subsequent encounter for open fracture type I or II with nonunion
N — subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion
P — subsequent encounter for closed fracture with malunion
Q — subsequent encounter for open fracture type I or II with malunion
R — subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion
S — sequela
Applies from S52.5 Fracture of lower end of radius
Applicable to
Fracture of distal end of radius
Excludes2 (not included here)
physeal fractures of lower end of radius (S59.2-)
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 S52.509R
Type 1 Excludes: M84.4 Pathological fracture, not elsewhere classified ("traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)")
Type 1 Excludes: S51 Open wound of elbow and forearm ("open fracture of elbow and forearm (S52.- with open fracture 7th character)")
Type 2 Excludes: S62 Fracture at wrist and hand level ("fracture of distal parts of ulna and radius (S52.-)")
Nearby codes
S52.509K Unspecified fracture of the lower end of unspecified radius, subsequent encounter for closed fracture with nonunion
S52.509M Unspecified fracture of the lower end of unspecified radius, subsequent encounter for open fracture type I or II with nonunion
S52.509N Unspecified fracture of the lower end of unspecified radius, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion
S52.509P Unspecified fracture of the lower end of unspecified radius, subsequent encounter for closed fracture with malunion
S52.509Q Unspecified fracture of the lower end of unspecified radius, subsequent encounter for open fracture type I or II with malunion
S52.509R Unspecified fracture of the lower end of unspecified radius, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion (this code)
S52.509S Unspecified fracture of the lower end of unspecified radius, sequela