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ICD-10 Guide
ICD-10 CodesS13.120

S13.120

Billable

Subluxation of C1/C2 cervical vertebrae

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

Code Description

ICD-10 S13.120 is a billable code used to indicate a diagnosis of subluxation of c1/c2 cervical vertebrae.

Key Diagnostic Point:

Subluxation of the C1 and C2 cervical vertebrae refers to a partial dislocation of the first two cervical vertebrae, which can lead to significant neurological impairment and pain. This condition often arises from trauma, such as motor vehicle accidents, falls, or sports injuries, where the neck is subjected to sudden forces. The C1 vertebra, also known as the atlas, supports the skull, while the C2 vertebra, or axis, allows for rotational movement of the head. Subluxation can result in compression of the spinal cord or nerve roots, leading to symptoms such as neck pain, headaches, dizziness, and neurological deficits. Diagnosis typically involves a thorough clinical examination, imaging studies like X-rays or MRI, and assessment of neurological function. Management may include conservative treatment such as physical therapy, cervical collars, or in severe cases, surgical intervention to stabilize the vertebrae. Complications can include chronic pain, persistent neurological deficits, or further spinal instability if not properly managed.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and symptoms
  • Need for precise documentation of mechanism of injury
  • Potential for associated neurological injuries
  • Differentiation from other cervical spine injuries

Audit Risk Factors

  • Inadequate documentation of the mechanism of injury
  • Failure to document neurological assessments
  • Misclassification of the severity of the injury
  • Inconsistent use of imaging results in documentation

Specialty Focus

Medical Specialties

Emergency Medicine

Documentation Requirements

Documentation must include a detailed account of the mechanism of injury, neurological assessment, and imaging results.

Common Clinical Scenarios

Trauma cases from falls, vehicle accidents, or sports injuries presenting with neck pain and neurological symptoms.

Billing Considerations

Ensure that all relevant imaging studies are documented and correlate with clinical findings.

Surgery

Documentation Requirements

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

Common Clinical Scenarios

Surgical intervention for unstable subluxation requiring fusion or decompression.

Billing Considerations

Document any pre-existing conditions that may affect surgical outcomes.

Coding Guidelines

Inclusion Criteria

Use S13.120 When
  • Follow the ICD
  • CM guidelines for coding injuries, ensuring that the specific site and nature of the injury are accurately captured
  • Document the mechanism of injury and any associated conditions

Exclusion Criteria

Do NOT use S13.120 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

63015CPT Code

Laminectomy, cervical, for decompression of spinal cord

Clinical Scenario

Used in cases where surgical intervention is necessary due to neurological compromise.

Documentation Requirements

Operative report must detail the procedure and indications.

Specialty Considerations

Ensure that the surgical approach aligns with the diagnosis of subluxation.

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 diagnoses and treatment plans. S13.120 provides a clear distinction between subluxation and other types of cervical injuries.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of cervical spine injuries, improving the accuracy of diagnoses and treatment plans. S13.120 provides a clear distinction between subluxation and other types of cervical injuries.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of cervical spine injuries, improving the accuracy of diagnoses and treatment plans. S13.120 provides a clear distinction between subluxation and other types of cervical injuries.

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 is the difference between subluxation and dislocation?

Subluxation refers to a partial dislocation where the joint surfaces are still in contact, while dislocation indicates a complete separation of the joint surfaces.