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v1.0.0
ICD-10 Guide
ICD-10 CodesM21.21

M21.21

Billable

Flexion deformity, shoulder

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

Code Description

ICD-10 M21.21 is a billable code used to indicate a diagnosis of flexion deformity, shoulder.

Key Diagnostic Point:

Flexion deformity of the shoulder refers to a condition where the shoulder joint is unable to extend fully due to a fixed flexed position. This acquired deformity can result from various factors, including trauma, neurological conditions, or prolonged immobilization. Patients may present with limited range of motion, pain, and functional impairment, significantly affecting daily activities. The condition can arise from conditions such as adhesive capsulitis, rotator cuff injuries, or post-surgical complications. Treatment often involves physical therapy, surgical intervention, or corrective procedures aimed at restoring normal shoulder function. In cases where the flexion deformity is severe, surgical options may include tendon release or shoulder arthroplasty. Accurate coding is essential for proper reimbursement and to reflect the complexity of the patient's condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of the deformity
  • Need for detailed documentation of the underlying cause
  • Potential for multiple co-existing conditions affecting the shoulder
  • Differentiation from other shoulder deformities and conditions

Audit Risk Factors

  • Inadequate documentation of the cause of the deformity
  • Failure to document the severity and functional limitations
  • Incorrect coding of associated conditions
  • Lack of clarity in treatment plans and outcomes

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed notes on the patient's history, physical examination findings, imaging studies, and treatment plans.

Common Clinical Scenarios

Patients with post-traumatic shoulder flexion deformities or those with adhesive capsulitis.

Billing Considerations

Ensure that all relevant imaging and therapy notes are included to support the diagnosis.

Physical Medicine and Rehabilitation

Documentation Requirements

Comprehensive assessments of functional limitations and rehabilitation goals.

Common Clinical Scenarios

Patients undergoing rehabilitation for shoulder injuries or post-surgical recovery.

Billing Considerations

Document progress notes and therapy outcomes to justify the need for ongoing treatment.

Coding Guidelines

Inclusion Criteria

Use M21.21 When
  • Follow the official ICD
  • CM coding guidelines, ensuring that the code is used only when the flexion deformity is documented and confirmed
  • Include any relevant co
  • existing conditions that may affect treatment and outcomes

Exclusion Criteria

Do NOT use M21.21 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

23470CPT Code

Shoulder arthroscopy, diagnostic, with or without synovial biopsy

Clinical Scenario

Used in conjunction with M21.21 for patients undergoing evaluation for surgical correction.

Documentation Requirements

Document the indication for the procedure and findings during the arthroscopy.

Specialty Considerations

Orthopedic surgeons should ensure that the surgical necessity is well-documented.

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 flexion deformity of the shoulder, improving the accuracy of patient records and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like flexion deformity of the shoulder, improving the accuracy of patient records and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

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 flexion deformity in the shoulder?

Flexion deformity in the shoulder can be caused by various factors, including trauma, neurological conditions, or prolonged immobilization, leading to soft tissue contractures and muscle imbalances.