S52.279R Monteggia's fracture of unspecified ulna, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion
Billable ICD-10-CM code, FY2026.
Built from S52.279 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 S52.27 Monteggia's fracture of ulna
Applicable to
Fracture of upper shaft of ulna with dislocation of radial head
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 S52.279R
Back-references to S52.27
Type 1 Excludes: S53.0 Subluxation and dislocation of radial head ("Monteggia's fracture-dislocation (S52.27-)")
Back-references to S52.2
Type 2 Excludes: S52.0 Fracture of upper end of ulna ("fractures of shaft of ulna (S52.2-)")