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ICD-10 Coding for Sacroiliac Joint Disease(M46.1, S33.6)

Complete ICD-10-CM coding and documentation guide for Sacroiliac Joint Disease. Includes clinical validation requirements, documentation requirements, and coding pitfalls.

Also known as:

SI Joint DysfunctionSacroiliitis

Related ICD-10 Code Ranges

Complete code families applicable to Sacroiliac Joint Disease

M46-M53Primary Range

Other inflammatory spondylopathies and dorsopathies

This range includes codes for inflammatory conditions affecting the sacroiliac joint, such as sacroiliitis.

Dislocation and sprain of joints and ligaments of lumbar spine and pelvis

This range includes codes for traumatic injuries to the sacroiliac joint, such as sprains.

Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

CodeDescriptionWhen to UseKey Documentation
M46.1Sacroiliitis, not elsewhere classifiedUse for confirmed inflammatory sacroiliitis with supporting imaging or lab results.
  • MRI showing bone marrow edema
  • Positive HLA-B27 with SI joint erosion
S33.6Sprain of sacroiliac jointUse for acute traumatic injuries to the sacroiliac joint.
  • Mechanism of injury documented
  • Positive thigh thrust test

Clinical Decision Support

Always review the patient's clinical documentation thoroughly. When in doubt, choose the more specific code and ensure documentation supports it.

Key Information: ICD-10 code for sacroiliac joint disease

Essential facts and insights about Sacroiliac Joint Disease

The ICD-10 code for sacroiliac joint disease is M46.1 for inflammatory sacroiliitis and S33.6 for traumatic sprain of the sacroiliac joint.

Primary ICD-10-CM Codes for sacroiliac joint disease

Sacroiliitis, not elsewhere classified
Billable Code

Decision Criteria

clinical Criteria

  • MRI shows bone marrow edema in the SI joint.

documentation Criteria

  • Documented positive HLA-B27 test.

Applicable To

  • Inflammatory sacroiliitis

Excludes

  • Ankylosing spondylitis (M45.9)

Clinical Validation Requirements

  • MRI showing bone marrow edema
  • Positive HLA-B27 with SI joint erosion

Code-Specific Risks

  • Risk of denial if laterality is not specified when documented.

Coding Notes

  • Ensure documentation includes laterality and specific clinical findings.

Ancillary Codes

Additional codes that should be used in conjunction with the main diagnosis codes when applicable.

Biomechanical lesions, not elsewhere classified

M99.0
Use when there is biomechanical dysfunction such as pelvic asymmetry.

Differential Codes

Alternative codes to consider when ruling out similar conditions to the primary diagnosis.

Ankylosing spondylitis

M45.9
Use M45.9 if there is evidence of bamboo spine or bilateral SI fusion.

Documentation & Coding Risks

Avoid these common documentation and coding issues when documenting Sacroiliac Joint Disease to ensure proper reimbursement, maintain compliance, and reduce audit risk. These guidelines are particularly important when using ICD-10 code M46.1.

Impact

Clinical: May lead to inappropriate treatment plans., Regulatory: Non-compliance with documentation standards., Financial: Potential for claim denials or reduced reimbursement.

Mitigation Strategy

Use specific clinical terms and test results., Include imaging findings and detailed physical exam notes.

Impact

Reimbursement: May lead to claim denials if specificity is not provided., Compliance: Non-compliance with coding guidelines., Data Quality: Inaccurate data representation of the patient's condition.

Mitigation Strategy

Specify whether the disorder is inflammatory or mechanical and document accordingly.

Impact

Claims with M46.1 without supporting imaging or lab results.

Mitigation Strategy

Ensure documentation includes MRI or lab results supporting sacroiliitis.

Documentation errors, coding pitfalls, and audit risks are interconnected aspects of medical coding and billing. Addressing all three areas helps ensure accurate coding, optimal reimbursement, and regulatory compliance.

Frequently Asked Questions

Common questions about ICD-10 coding for Sacroiliac Joint Disease, with expert answers to help guide accurate code selection and documentation.

Documentation Templates for Sacroiliac Joint Disease

Use these documentation templates to ensure complete and accurate documentation for Sacroiliac Joint Disease. These templates include all required elements for proper coding and billing.

Chronic Sacroiliac Joint Pain

Specialty: Pain Management

Required Elements

  • Subjective pain description
  • Objective physical exam findings
  • Imaging results
  • Treatment plan

Examples: Poor vs. Good Documentation

Poor Documentation Example
SI joint pain, plan for injection.
Good Documentation Example
Patient reports R buttock pain localized to sacral sulcus (7/10 VAS), worsens with prolonged sitting. Tender over R Fortin’s point, positive thigh thrust, FABER, Gaenslen tests. MRI R SI joint: Subchondral bone edema without erosions. Plan: Image-guided R SI joint injection (27096) after failed 6-month PT/NSAID trial.
Explanation
The good example provides specific location, test results, and imaging findings, supporting the diagnosis and treatment plan.

Need help with ICD-10 coding for Sacroiliac Joint Disease? Ask your questions below.

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