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v1.0.0
ICD-10 Guide
ICD-10 CodesM46.40

M46.40

Billable

Discitis, unspecified, site unspecified

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

Code Description

ICD-10 M46.40 is a billable code used to indicate a diagnosis of discitis, unspecified, site unspecified.

Key Diagnostic Point:

Discitis is an inflammatory condition affecting the intervertebral discs, often resulting from infection, trauma, or degenerative changes. It can lead to severe back pain, fever, and neurological deficits if not treated promptly. The term 'unspecified' indicates that the exact site of the discitis is not documented, which can complicate diagnosis and treatment. Discitis may be associated with spondylopathies, including ankylosing spondylitis, where inflammation of the spine can lead to disc degeneration. Inflammatory spine conditions can also contribute to discitis, as they may predispose the discs to infection or inflammation. Spinal stenosis, characterized by narrowing of the spinal canal, can exacerbate symptoms of discitis by increasing pressure on the spinal nerves. Accurate diagnosis often requires imaging studies, such as MRI or CT scans, and laboratory tests to identify potential infectious agents. Treatment typically involves antibiotics for infectious causes, anti-inflammatory medications, and in some cases, surgical intervention to relieve pressure on the spinal cord or nerves.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Unspecified site can lead to ambiguity in treatment and coding.
  • Differentiating between infectious and non-infectious causes requires thorough documentation.
  • Potential overlap with other spinal conditions complicates coding.
  • Variability in clinical presentation may lead to misdiagnosis.

Audit Risk Factors

  • Lack of specificity in documentation may trigger audits.
  • Inconsistent clinical findings reported in the medical record.
  • Failure to document the relationship between discitis and other spinal conditions.
  • Inadequate imaging or lab results to support the diagnosis.

Specialty Focus

Medical Specialties

Orthopedic Surgery

Documentation Requirements

Detailed notes on physical examination findings, imaging results, and treatment plans.

Common Clinical Scenarios

Patients presenting with back pain, fever, and neurological symptoms.

Billing Considerations

Ensure clear documentation of the site and nature of the discitis to avoid unspecified coding.

Rheumatology

Documentation Requirements

Comprehensive history of inflammatory conditions, lab results, and response to treatment.

Common Clinical Scenarios

Patients with a history of ankylosing spondylitis presenting with new back pain.

Billing Considerations

Document any inflammatory markers and imaging findings to support the diagnosis.

Coding Guidelines

Inclusion Criteria

Use M46.40 When
  • Follow official ICD
  • 10 coding guidelines, ensuring that the diagnosis is supported by clinical documentation
  • Include any relevant imaging or lab results that confirm the diagnosis of discitis
  • The unspecified nature of the site should be clearly justified in the medical record

Exclusion Criteria

Do NOT use M46.40 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

72040CPT Code

MRI of the spine

Clinical Scenario

Used to confirm the diagnosis of discitis.

Documentation Requirements

MRI report must clearly indicate findings related to discitis.

Specialty Considerations

Orthopedic and rheumatology specialists should ensure imaging correlates with clinical findings.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like discitis, improving the granularity of data for epidemiological studies and treatment outcomes. M46.40 reflects the need for careful documentation to avoid unspecified coding.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like discitis, improving the granularity of data for epidemiological studies and treatment outcomes. M46.40 reflects the need for careful documentation to avoid unspecified coding.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of conditions like discitis, improving the granularity of data for epidemiological studies and treatment outcomes. M46.40 reflects the need for careful documentation to avoid unspecified coding.

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 should I document to support the use of M46.40?

Document the patient's symptoms, clinical findings, imaging results, and any relevant history of inflammatory or infectious conditions to justify the use of the unspecified code.