S32.423K Displaced fracture of posterior wall of unspecified acetabulum, subsequent encounter for fracture with nonunion

Billable ICD-10-CM code, FY2026.

Built from S32.423 with 7th character K (subsequent encounter for fracture with nonunion).

Applies from S32 Fracture of lumbar spine and pelvis

Includes

• fracture of lumbosacral neural arch
• fracture of lumbosacral spinous process
• fracture of lumbosacral transverse process
• fracture of lumbosacral vertebra
• fracture of lumbosacral vertebral arch

Excludes1 (never code together)

• transection of abdomen (S38.3)

Excludes2 (not included here)

• fracture of hip NOS (S72.0-)

Code first

• any associated spinal cord and spinal nerve injury (S34.-)

7th character note

• The appropriate 7th character is to be added to each code from category S32

Notes

• A fracture not indicated as displaced or nondisplaced should be coded to displaced
• A fracture not indicated as opened 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
• S — sequela

Applies from S32.4 Fracture of acetabulum

Code also

• any associated fracture of pelvic ring (S32.8-)

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 S32.423K

Back-references to S32.4

• Code Also: S32.8 Fracture of other parts of pelvis ("fracture of acetabulum (S32.4-)")

Back-references to S32

• Type 1 Excludes: M48.5 Collapsed vertebra, not elsewhere classified ("traumatic fracture of vertebra (S12.-, S22.-, S32.-)")
• 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.-)")
• Use Additional: S38.1 Crushing injury of abdomen, lower back, and pelvis ("fracture of thoracic or lumbar spine and pelvis (S22.0-, S32.-)")

Nearby codes

• S32.423 Displaced fracture of posterior wall of unspecified acetabulum
• S32.423A Displaced fracture of posterior wall of unspecified acetabulum, initial encounter for closed fracture
• S32.423B Displaced fracture of posterior wall of unspecified acetabulum, initial encounter for open fracture
• S32.423D Displaced fracture of posterior wall of unspecified acetabulum, subsequent encounter for fracture with routine healing
• S32.423G Displaced fracture of posterior wall of unspecified acetabulum, subsequent encounter for fracture with delayed healing
• S32.423K Displaced fracture of posterior wall of unspecified acetabulum, subsequent encounter for fracture with nonunion (this code)
• S32.423S Displaced fracture of posterior wall of unspecified acetabulum, sequela
• S32.424 Nondisplaced fracture of posterior wall of right acetabulum
• S32.424A Nondisplaced fracture of posterior wall of right acetabulum, initial encounter for closed fracture
• S32.424B Nondisplaced fracture of posterior wall of right acetabulum, initial encounter for open fracture
• S32.424D Nondisplaced fracture of posterior wall of right acetabulum, subsequent encounter for fracture with routine healing