ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesM46.01

M46.01

Billable

Spinal enthesopathy, occipito-atlanto-axial region

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

Code Description

ICD-10 M46.01 is a billable code used to indicate a diagnosis of spinal enthesopathy, occipito-atlanto-axial region.

Key Diagnostic Point:

Spinal enthesopathy in the occipito-atlanto-axial region refers to a condition characterized by inflammation and degeneration at the sites where tendons and ligaments attach to the vertebrae in the upper cervical spine. This condition can be associated with various inflammatory spine diseases, including ankylosing spondylitis, which is a type of spondyloarthritis that primarily affects the spine and the sacroiliac joints. Patients may present with neck pain, stiffness, and reduced range of motion, particularly in the morning or after periods of inactivity. The condition can lead to significant discomfort and may contribute to spinal stenosis, where the spinal canal narrows, potentially compressing the spinal cord and nerves. Diagnosis typically involves clinical evaluation, imaging studies such as MRI or CT scans, and sometimes laboratory tests to rule out other inflammatory conditions. Treatment may include physical therapy, anti-inflammatory medications, and in some cases, surgical intervention if conservative measures fail.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiation from other spinal conditions
  • Need for comprehensive documentation of symptoms
  • Potential overlap with other inflammatory diseases
  • Variability in clinical presentation

Audit Risk Factors

  • Inadequate documentation of clinical findings
  • Failure to specify the anatomical site
  • Misdiagnosis or coding of related conditions
  • Lack of imaging studies to support diagnosis

Specialty Focus

Medical Specialties

Rheumatology

Documentation Requirements

Detailed history of symptoms, physical examination findings, imaging results, and response to treatment.

Common Clinical Scenarios

Patients presenting with chronic neck pain, stiffness, and a history of inflammatory arthritis.

Billing Considerations

Ensure that the documentation clearly indicates the relationship between enthesopathy and any underlying inflammatory conditions.

Orthopedics

Documentation Requirements

Comprehensive assessment of spinal alignment, range of motion, and any neurological deficits.

Common Clinical Scenarios

Patients with severe neck pain and potential neurological symptoms due to spinal stenosis.

Billing Considerations

Document any surgical interventions or referrals for further evaluation.

Coding Guidelines

Inclusion Criteria

Use M46.01 When
  • Follow the official ICD
  • CM coding guidelines, ensuring accurate documentation of the condition's specifics, including the anatomical site and any associated conditions

Exclusion Criteria

Do NOT use M46.01 When
  • Exclude codes for conditions that do not directly relate to enthesopathy

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

Arthrocentesis, aspiration and/or injection into a major joint or bursa

Clinical Scenario

Used when injecting corticosteroids into the cervical spine region for symptomatic relief.

Documentation Requirements

Document the indication for the procedure, the specific joint or region treated, and the patient's response.

Specialty Considerations

Rheumatologists and orthopedic surgeons should ensure clear documentation of the diagnosis and treatment plan.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of spinal conditions, improving the accuracy of diagnoses and treatment tracking. M46.01 provides a clear distinction for enthesopathy in the occipito-atlanto-axial region, which was less defined in ICD-9.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of spinal conditions, improving the accuracy of diagnoses and treatment tracking. M46.01 provides a clear distinction for enthesopathy in the occipito-atlanto-axial region, which was less defined in ICD-9.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of spinal conditions, improving the accuracy of diagnoses and treatment tracking. M46.01 provides a clear distinction for enthesopathy in the occipito-atlanto-axial region, which was less 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 is the primary cause of spinal enthesopathy in the occipito-atlanto-axial region?

Spinal enthesopathy in this region is often associated with inflammatory conditions such as ankylosing spondylitis, which leads to inflammation at the sites where ligaments and tendons attach to the vertebrae.