`S82.851C` Displaced trimalleolar fracture of right lower leg, initial encounter for open fracture type IIIA, IIIB, or IIIC

Billable ICD-10-CM code, FY2026.

Built from S82.851 with 7th character C (initial encounter for open fracture type IIIA, IIIB, or IIIC).

fracture of foot, except ankle (S92.-)
periprosthetic fracture around internal prosthetic ankle joint (M97.2)
periprosthetic fracture around internal prosthetic implant of knee joint (M97.1-)

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

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

Code annotations containing back-references to S82.851C

Type 1 Excludes: S82.3 Fracture of lower end of tibia ("trimalleolar fractures of lower leg (S82.85-)")

Type 2 Excludes: M23 Internal derangement of knee ("current injury - see injury of knee and lower leg (S80-S89)")
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: S72 Fracture of femur ("fracture of lower leg and ankle (S82.-)")
Type 1 Excludes: S81 Open wound of knee and lower leg ("open fracture of knee and lower leg (S82.-)")
Type 2 Excludes: S92 Fracture of foot and toe, except ankle ("fracture of ankle (S82.-)")
Type 2 Excludes: S92 Fracture of foot and toe, except ankle ("fracture of malleolus (S82.-)")

S82.846S Nondisplaced bimalleolar fracture of unspecified lower leg, sequela
S82.85 Trimalleolar fracture of lower leg
S82.851 Displaced trimalleolar fracture of right lower leg
S82.851A Displaced trimalleolar fracture of right lower leg, initial encounter for closed fracture
S82.851B Displaced trimalleolar fracture of right lower leg, initial encounter for open fracture type I or II
S82.851C Displaced trimalleolar fracture of right lower leg, initial encounter for open fracture type IIIA, IIIB, or IIIC (this code)
S82.851D Displaced trimalleolar fracture of right lower leg, subsequent encounter for closed fracture with routine healing
S82.851E Displaced trimalleolar fracture of right lower leg, subsequent encounter for open fracture type I or II with routine healing
S82.851F Displaced trimalleolar fracture of right lower leg, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with routine healing
S82.851G Displaced trimalleolar fracture of right lower leg, subsequent encounter for closed fracture with delayed healing
S82.851H Displaced trimalleolar fracture of right lower leg, subsequent encounter for open fracture type I or II with delayed healing