S92.346B Nondisplaced fracture of fourth metatarsal bone, unspecified foot, initial encounter for open fracture

Billable ICD-10-CM code, FY2026.

Built from S92.346 with 7th character B (initial encounter for open fracture).

Applies from S92 Fracture of foot and toe, except ankle

Excludes2 (not included here)

• fracture of ankle (S82.-)
• fracture of malleolus (S82.-)
• traumatic amputation of ankle and foot (S98.-)

7th character note

• The appropriate 7th character is to be added to each code from category S92

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

Applies from S92.3 Fracture of metatarsal bone(s)

Excludes2 (not included here)

• Physeal fracture of metatarsal (S99.1-)

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 S92.346B

Back-references to S92

• 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 foot (S92.-)")
• Type 2 Excludes: S82 Fracture of lower leg, including ankle ("fracture of foot, except ankle (S92.-)")
• Type 1 Excludes: S91 Open wound of ankle, foot and toes ("open fracture of ankle, foot and toes (S92.-with 7th character B)")

Nearby codes

• S92.345K Nondisplaced fracture of fourth metatarsal bone, left foot, subsequent encounter for fracture with nonunion
• S92.345P Nondisplaced fracture of fourth metatarsal bone, left foot, subsequent encounter for fracture with malunion
• S92.345S Nondisplaced fracture of fourth metatarsal bone, left foot, sequela
• S92.346 Nondisplaced fracture of fourth metatarsal bone, unspecified foot
• S92.346A Nondisplaced fracture of fourth metatarsal bone, unspecified foot, initial encounter for closed fracture
• S92.346B Nondisplaced fracture of fourth metatarsal bone, unspecified foot, initial encounter for open fracture (this code)
• S92.346D Nondisplaced fracture of fourth metatarsal bone, unspecified foot, subsequent encounter for fracture with routine healing
• S92.346G Nondisplaced fracture of fourth metatarsal bone, unspecified foot, subsequent encounter for fracture with delayed healing
• S92.346K Nondisplaced fracture of fourth metatarsal bone, unspecified foot, subsequent encounter for fracture with nonunion
• S92.346P Nondisplaced fracture of fourth metatarsal bone, unspecified foot, subsequent encounter for fracture with malunion
• S92.346S Nondisplaced fracture of fourth metatarsal bone, unspecified foot, sequela