S12.431K Unspecified traumatic nondisplaced spondylolisthesis of fifth cervical vertebra, subsequent encounter for fracture with nonunion

Billable ICD-10-CM code, FY2026.

Built from S12.431 with 7th character K (subsequent encounter for fracture with nonunion).

Applies from S12 Fracture of cervical vertebra and other parts of neck

Includes

• fracture of cervical neural arch
• fracture of cervical spine
• fracture of cervical spinous process
• fracture of cervical transverse process
• fracture of cervical vertebral arch
• fracture of neck

Code first

• any associated cervical spinal cord injury (S14.0, S14.1-)

7th character note

• The appropriate 7th character is to be added to all codes from subcategories S12.0-S12.6

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
• S — sequela

Code annotations containing back-references to S12.431K

Back-references to S12

• 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.-)")
• Type 2 Excludes: S11 Open wound of neck ("open fracture of vertebra (S12.- with 7th character B)")
• Type 2 Excludes: S27 Injury of other and unspecified intrathoracic organs ("injury of cervical esophagus (S10-S19)")
• Type 2 Excludes: S27 Injury of other and unspecified intrathoracic organs ("injury of trachea (cervical) (S10-S19)")

Diagnosis Index entries for S12.431K

• Spondylolisthesis (acquired) (degenerative) › traumatic (old) › acute › fifth cervical (displaced) › nondisplaced

Nearby codes

• S12.431 Unspecified traumatic nondisplaced spondylolisthesis of fifth cervical vertebra
• S12.431A Unspecified traumatic nondisplaced spondylolisthesis of fifth cervical vertebra, initial encounter for closed fracture
• S12.431B Unspecified traumatic nondisplaced spondylolisthesis of fifth cervical vertebra, initial encounter for open fracture
• S12.431D Unspecified traumatic nondisplaced spondylolisthesis of fifth cervical vertebra, subsequent encounter for fracture with routine healing
• S12.431G Unspecified traumatic nondisplaced spondylolisthesis of fifth cervical vertebra, subsequent encounter for fracture with delayed healing
• S12.431K Unspecified traumatic nondisplaced spondylolisthesis of fifth cervical vertebra, subsequent encounter for fracture with nonunion (this code)
• S12.431S Unspecified traumatic nondisplaced spondylolisthesis of fifth cervical vertebra, sequela
• S12.44 Type III traumatic spondylolisthesis of fifth cervical vertebra
• S12.44XA Type III traumatic spondylolisthesis of fifth cervical vertebra, initial encounter for closed fracture
• S12.44XB Type III traumatic spondylolisthesis of fifth cervical vertebra, initial encounter for open fracture
• S12.44XD Type III traumatic spondylolisthesis of fifth cervical vertebra, subsequent encounter for fracture with routine healing