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ICD-10 Guide
ICD-10 CodesM46.81

M46.81

Billable

Other specified inflammatory spondylopathies, occipito-atlanto-axial region

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/17/2025

Code Description

ICD-10 M46.81 is a billable code used to indicate a diagnosis of other specified inflammatory spondylopathies, occipito-atlanto-axial region.

Key Diagnostic Point:

M46.81 refers to inflammatory spondylopathies that specifically affect the occipito-atlanto-axial region of the spine. This condition is characterized by inflammation of the vertebrae in the upper cervical spine, which can lead to pain, stiffness, and reduced mobility. Inflammatory spondylopathies encompass a range of disorders, including ankylosing spondylitis, which primarily affects the sacroiliac joints and can extend to the cervical spine. Patients may present with chronic neck pain, morning stiffness, and neurological symptoms if spinal stenosis occurs due to inflammation or structural changes. Diagnosis typically involves clinical evaluation, imaging studies such as MRI or CT scans, and laboratory tests to identify inflammatory markers. Treatment may include anti-inflammatory medications, physical therapy, and in severe cases, surgical intervention. Accurate coding is essential for proper management and reimbursement, as these conditions can significantly impact a patient's quality of life and functional abilities.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and symptoms
  • Need for precise documentation of inflammatory markers
  • Differentiation from other spondylopathies and spinal conditions
  • Potential for overlapping diagnoses

Audit Risk Factors

  • Insufficient documentation of inflammatory symptoms
  • Lack of imaging studies to support diagnosis
  • Inconsistent use of terminology in clinical notes
  • Failure to document the impact on daily activities

Specialty Focus

Medical Specialties

Rheumatology

Documentation Requirements

Detailed history of symptoms, physical examination findings, and laboratory results.

Common Clinical Scenarios

Patients presenting with chronic neck pain and stiffness, particularly in younger adults.

Billing Considerations

Documentation should include the duration of symptoms and response to treatment.

Orthopedics

Documentation Requirements

Imaging results, surgical notes if applicable, and functional assessments.

Common Clinical Scenarios

Patients requiring surgical intervention for severe spinal stenosis due to inflammatory changes.

Billing Considerations

Ensure that the surgical necessity is clearly documented to support coding.

Coding Guidelines

Inclusion Criteria

Use M46.81 When
  • Follow the official ICD
  • CM coding guidelines, ensuring that the diagnosis is supported by clinical documentation
  • Include any relevant imaging studies and laboratory results that confirm the inflammatory nature of the spondylopathy

Exclusion Criteria

Do NOT use M46.81 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

72148CPT Code

MRI of the cervical spine

Clinical Scenario

Used to evaluate inflammatory changes in the occipito-atlanto-axial region.

Documentation Requirements

MRI report must be included in the patient's medical record.

Specialty Considerations

Rheumatologists and orthopedic surgeons should ensure imaging is relevant to the diagnosis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of inflammatory spondylopathies, improving the accuracy of diagnoses and treatment plans. M46.81 provides a distinct code for conditions affecting the occipito-atlanto-axial region, which was less clearly defined in ICD-9.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of inflammatory spondylopathies, improving the accuracy of diagnoses and treatment plans. M46.81 provides a distinct code for conditions affecting the occipito-atlanto-axial region, which was less clearly defined in ICD-9.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of inflammatory spondylopathies, improving the accuracy of diagnoses and treatment plans. M46.81 provides a distinct code for conditions affecting the occipito-atlanto-axial region, which was less clearly defined 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 are the common symptoms associated with M46.81?

Common symptoms include chronic neck pain, stiffness, and potential neurological symptoms due to inflammation or stenosis in the cervical spine.