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ICD-10 Guide
DiagnosesAnterior Cruciate Ligament

Anterior Cruciate Ligament

ICD-10 Coding for Anterior Cruciate Ligament Injury(S83.511A, M23.521)

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

Diagnosis Overview

What is Anterior Cruciate Ligament?
Essential facts and insights about Anterior Cruciate Ligament Injury

Key Clinical Considerations:

  • Patient presents with knee pain, swelling, and instability following a traumatic event, often during sports activities.
  • MRI findings may show a complete or partial tear of the anterior cruciate ligament (ACL).
  • Physical examination may reveal a positive Lachman test or anterior drawer test indicating ACL injury.
  • Imaging findings may include joint effusion, bone contusions, or associated meniscal tears on MRI.
  • Severity is often classified based on the degree of ligamentous injury: Grade I (sprain), Grade II (partial tear), and Grade III (complete tear).

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must include a detailed history of the injury, mechanism of injury, and symptomatology.
  • Specific terminology such as 'ACL tear', 'sprain', or 'instability' must be documented clearly.
  • Examples include: 'Patient diagnosed with a complete ACL tear based on MRI findings and physical examination.'
  • Documentation must support medical necessity for imaging and any surgical interventions.
  • Quality measures may include documentation of functional assessments and follow-up care plans.

Coding Guidelines

Usage Guidelines & Examples

  • Use S83.511A for an initial encounter of a complete ACL tear; use M23.521 for a chronic ACL injury.
  • Do not use these codes for injuries not involving the ACL or for conditions like patellar tendonitis.
  • S83.511A is specific to the ACL, while S83.519A may be used for unspecified knee ligament injuries.
  • Common errors include using the wrong encounter code (initial vs. subsequent) or failing to specify the side of the injury.
  • In complex cases, consider the mechanism of injury and associated injuries to select the most accurate code.

Code Exclusions

Important Exclusions

  • Excludes conditions such as ACL sprains (S83.511) that do not meet the criteria for a complete tear.
  • Alternative codes for excluded conditions include S83.519A for unspecified knee ligament injuries.
  • Conditions are excluded based on the specific nature of the injury and the required treatment approach.
  • Common mistakes include misclassifying a sprain as a complete tear, leading to incorrect coding.
  • Related but distinct conditions include collateral ligament injuries and meniscal tears, which require different codes.

Related ICD-10 Codes

Primary Codes
S83.511A
Complete tear of anterior cruciate ligament of right knee, initial encounter
M23.521
Chronic instability due to anterior cruciate ligament injury of right knee
Ancillary Codes
W01.0XXA
Differential Codes
S83.512A
M23.522

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Orthopedics

Specialty Applications

  • Applies to acute ACL injuries typically seen in athletes or active individuals.
  • Patient populations include young athletes, particularly those involved in sports with high pivoting demands.
  • Clinical settings include outpatient orthopedic clinics, emergency departments, and inpatient surgical units.
  • Specialty-specific applications are relevant in orthopedics, sports medicine, and rehabilitation.
  • Treatment contexts include surgical reconstruction, physical therapy, and post-injury rehabilitation.

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 ACL tear based on MRI findings and positive Lachman test.'

Template 2

Template: 'Clinical presentation consistent with ACL injury including knee instability and swelling.'

Template 3

Template: 'Diagnostic criteria for ACL tear met as evidenced by MRI showing complete ligament disruption.'

Template 4

Template: 'Treatment plan initiated for ACL injury with surgical reconstruction scheduled.'

Template 5

Template: 'Follow-up care for ACL injury including monitoring of range of motion and strength.'

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?

Detailed documentation should include the mechanism of injury, clinical findings, and imaging results.

How does this differ from similar diagnoses?

ACL injuries are characterized by specific symptoms and diagnostic criteria that differentiate them from other knee injuries.

What are common billing considerations?

Reimbursement may depend on the accuracy of coding, documentation of medical necessity, and adherence to payer guidelines.

What procedures are typically associated?

Commonly associated procedures include ACL reconstruction (CPT 29888) and physical therapy interventions.

Are there any quality reporting implications?

Quality measures may include tracking functional outcomes and adherence to treatment protocols post-injury.