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ICD-10 Guide
ICD-10 CodesS13.121

S13.121

Billable

Dislocation of C1/C2 cervical vertebrae

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/11/2025

Code Description

ICD-10 S13.121 is a billable code used to indicate a diagnosis of dislocation of c1/c2 cervical vertebrae.

Key Diagnostic Point:

Dislocation of the C1 and C2 cervical vertebrae, also known as the atlas and axis, is a serious injury that can result from high-impact trauma, such as motor vehicle accidents, falls, or sports injuries. This dislocation can lead to significant instability in the cervical spine, potentially compromising the spinal cord and resulting in neurological deficits. The mechanism of injury often involves hyperextension or hyperflexion of the neck, which can cause the vertebrae to misalign. Clinically, patients may present with neck pain, limited range of motion, and neurological symptoms such as weakness or numbness in the extremities. Diagnosis typically involves imaging studies, including X-rays, CT scans, or MRIs, to assess the alignment of the cervical vertebrae and rule out associated injuries. Management may require immobilization, traction, or surgical intervention to restore stability and prevent further neurological compromise. Complications can include chronic pain, neurological deficits, and increased risk of future cervical spine injuries.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Requires precise documentation of the mechanism of injury.
  • Differentiation from other cervical spine injuries is necessary.
  • Potential for associated neurological injuries complicates coding.
  • Need for accurate imaging documentation to support coding.

Audit Risk Factors

  • Inadequate documentation of the mechanism of injury.
  • Failure to document neurological assessments.
  • Misclassification of dislocation severity.
  • Lack of imaging reports to support diagnosis.

Specialty Focus

Medical Specialties

Emergency Medicine

Documentation Requirements

Acute care documentation must include a detailed account of the injury mechanism, neurological status, and imaging results.

Common Clinical Scenarios

Trauma patients presenting with neck pain after a fall or motor vehicle accident.

Billing Considerations

Ensure that all neurological assessments are documented to support the severity of the injury.

Surgery

Documentation Requirements

Operative reports must detail the surgical approach, findings, and any stabilization techniques used.

Common Clinical Scenarios

Patients requiring surgical intervention for cervical stabilization following dislocation.

Billing Considerations

Document any intraoperative findings that may affect coding, such as additional injuries.

Coding Guidelines

Inclusion Criteria

Use S13.121 When
  • Follow the official ICD
  • CM coding guidelines, ensuring that the code is used only when the dislocation is confirmed by imaging and documented appropriately
  • The mechanism of injury should be clearly stated in the medical record

Exclusion Criteria

Do NOT use S13.121 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

22551CPT Code

Anterior cervical discectomy and fusion

Clinical Scenario

Used in cases where surgical intervention is required for dislocated C1/C2.

Documentation Requirements

Operative report detailing the procedure and indications.

Specialty Considerations

Ensure that the surgical approach is documented clearly.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of cervical spine injuries, improving the accuracy of data collection and reimbursement processes. S13.121 provides a clear distinction for dislocation, which was less specific in ICD-9.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of cervical spine injuries, improving the accuracy of data collection and reimbursement processes. S13.121 provides a clear distinction for dislocation, which was less specific in ICD-9.

Reimbursement & Billing Impact

reimbursement processes. S13.121 provides a clear distinction for dislocation, which was less specific in ICD-9.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What imaging is required to confirm a dislocation of C1/C2?

CT scans are preferred for detailed visualization of the cervical spine, but X-rays can also be used as an initial assessment.