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v1.0.0
ICD-10 Guide
DiagnosesAnterolisthesis

Anterolisthesis

ICD-10 Coding for Anterolisthesis(M43.16, M43.17)

PRIMARY SPECIALTYOrthopedics
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Anterolisthesis?
Essential facts and insights about Anterolisthesis

Key Clinical Considerations:

  • Patients may present with lower back pain, radicular pain, or neurological deficits depending on the severity and location of the anterolisthesis.
  • Imaging studies such as X-rays, CT scans, or MRIs may reveal slippage of one vertebra over another, typically at the lumbar spine.
  • Physical examination may show limited range of motion, tenderness over the affected area, and possible neurological signs such as weakness or numbness.
  • Imaging findings should confirm the degree of slippage, which is classified as Grade I (0-25%), Grade II (26-50%), Grade III (51-75%), or Grade IV (76-100%).
  • Severity may be assessed based on the degree of vertebral displacement and associated symptoms.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must include a clear diagnosis of anterolisthesis, including the specific vertebral levels involved.
  • Terminology such as 'anterolisthesis', 'spondylolisthesis', and the degree of slippage should be documented.
  • Examples include: 'Patient diagnosed with L4-L5 anterolisthesis, Grade II, based on MRI findings.'
  • Documentation must demonstrate medical necessity for imaging and treatment interventions.
  • Quality measures may include tracking outcomes related to pain relief and functional improvement post-treatment.

Coding Guidelines

Usage Guidelines & Examples

  • Use M43.16 for anterolisthesis of the lumbar region and M43.17 for anterolisthesis of the cervical region.
  • Do not use these codes for conditions like spondylolysis or other forms of spondylolisthesis without proper documentation.
  • Similar codes include M43.15 (spondylolisthesis) and M43.18 (other forms of spondylolisthesis).
  • Common errors include misclassifying the degree of slippage or failing to specify the vertebral levels involved.
  • In complex cases, ensure to document all relevant clinical findings and imaging results to support the selected code.

Code Exclusions

Important Exclusions

  • Excludes conditions such as spondylolysis, which is a defect in the vertebral arch without slippage.
  • Alternative codes for excluded conditions include M43.15 for spondylolisthesis.
  • Conditions are excluded to ensure accurate representation of the patient's specific spinal condition.
  • Common mistakes include using anterolisthesis codes for patients with purely degenerative changes without slippage.
  • Related but distinct conditions include kyphosis and scoliosis, which have different coding requirements.

Related ICD-10 Codes

Primary Codes
M43.16
Anterolisthesis, lumbar region
M43.17
Anterolisthesis, cervical region
Ancillary Codes
M54.16
Differential Codes
M43.17
M43.17
when the slippage occurs at the lumbosacral junction (
L5-
S1
).
M43.16
M43.16
for slippage in the lumbar region (
L1-
L5
) excluding
S1
.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Orthopedics

Specialty Applications

  • This diagnosis applies to patients with spinal instability due to vertebral slippage.
  • Patient populations include adults, particularly those over 50, and athletes at risk for spinal injuries.
  • Clinical settings include outpatient orthopedic clinics, inpatient rehabilitation facilities, and emergency departments.
  • Specialty-specific applications are relevant in orthopedics, neurosurgery, and pain management.
  • Treatment contexts include conservative management, surgical intervention, and physical therapy.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Patient diagnosed with anterolisthesis based on MRI findings showing L4-L5 slippage.'

Template 2

Template: 'Clinical presentation consistent with anterolisthesis including lower back pain and radicular symptoms.'

Template 3

Template: 'Diagnostic criteria met as evidenced by imaging showing Grade II anterolisthesis at L4-L5.'

Template 4

Template: 'Treatment plan initiated for anterolisthesis with physical therapy and pain management.'

Template 5

Template: 'Follow-up care for anterolisthesis including monitoring of neurological status and pain levels.'

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this diagnosis?

Documentation must include clinical findings, imaging results, and treatment plans.

How does this differ from similar diagnoses?

Anterolisthesis specifically refers to forward slippage, while spondylolisthesis can refer to any slippage.

What are common billing considerations?

Ensure that the diagnosis supports the medical necessity for imaging and treatment to optimize claims.

What procedures are typically associated?

Commonly associated CPT codes include spinal fusion and decompression procedures.

Are there any quality reporting implications?

Quality measures may include tracking surgical outcomes and patient-reported pain levels.