S52.043B Displaced fracture of coronoid process of unspecified ulna, initial encounter for open fracture type I or II
Billable ICD-10-CM code, FY2026.
Built from S52.043 with 7th character B (initial encounter for open fracture type I or II).
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 S52.0 Fracture of upper end of ulna
Applicable to
Fracture of proximal end of ulna
Excludes2 (not included here)
fracture of elbow NOS (S42.40-)
fractures of shaft of ulna (S52.2-)
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 S52.043B
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
S52.042Q Displaced fracture of coronoid process of left ulna, subsequent encounter for open fracture type I or II with malunion
S52.042R Displaced fracture of coronoid process of left ulna, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion
S52.042S Displaced fracture of coronoid process of left ulna, sequela
S52.043 Displaced fracture of coronoid process of unspecified ulna
S52.043A Displaced fracture of coronoid process of unspecified ulna, initial encounter for closed fracture
S52.043B Displaced fracture of coronoid process of unspecified ulna, initial encounter for open fracture type I or II (this code)
S52.043C Displaced fracture of coronoid process of unspecified ulna, initial encounter for open fracture type IIIA, IIIB, or IIIC
S52.043D Displaced fracture of coronoid process of unspecified ulna, subsequent encounter for closed fracture with routine healing
S52.043E Displaced fracture of coronoid process of unspecified ulna, subsequent encounter for open fracture type I or II with routine healing
S52.043F Displaced fracture of coronoid process of unspecified ulna, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with routine healing
S52.043G Displaced fracture of coronoid process of unspecified ulna, subsequent encounter for closed fracture with delayed healing