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v1.0.0
ICD-10 Guide
ICD-10 CodesQ66.50

Q66.50

Billable

Congenital pes planus, unspecified foot

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/11/2025

Code Description

ICD-10 Q66.50 is a billable code used to indicate a diagnosis of congenital pes planus, unspecified foot.

Key Diagnostic Point:

Congenital pes planus, also known as flatfoot, is a condition characterized by the absence of a normal arch in the foot, leading to a flat appearance. This condition can be present at birth and may be associated with other congenital malformations. In pediatric patients, it is essential to differentiate between flexible and rigid flatfoot, as treatment options may vary. Flexible flatfoot typically does not cause pain and may resolve as the child grows, while rigid flatfoot can lead to discomfort and may require intervention. The condition can be isolated or part of a syndrome involving other musculoskeletal or neurological abnormalities. Diagnosis is primarily clinical, supported by physical examination and, if necessary, imaging studies. Treatment options may include orthotic devices, physical therapy, or surgical intervention in severe cases. Accurate coding is crucial for appropriate management and reimbursement, especially in pediatric populations where growth and development are closely monitored.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiation between flexible and rigid flatfoot
  • Potential association with other congenital conditions
  • Variability in clinical presentation and severity
  • Need for multidisciplinary management

Audit Risk Factors

  • Inadequate documentation of clinical findings
  • Failure to specify associated conditions
  • Misclassification of flexible vs. rigid flatfoot
  • Lack of follow-up documentation

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Detailed growth and development assessments, including physical examination findings and any associated musculoskeletal issues.

Common Clinical Scenarios

Evaluation of a child presenting with flatfoot during routine check-ups or referrals for foot pain.

Billing Considerations

Consideration of family history of foot deformities and the impact on the child's mobility and quality of life.

Genetics

Documentation Requirements

Genetic evaluation for syndromic associations, including family history and any genetic testing results.

Common Clinical Scenarios

Assessment of flatfoot in the context of a broader genetic syndrome, such as Ehlers-Danlos syndrome.

Billing Considerations

Awareness of chromosomal abnormalities that may present with musculoskeletal anomalies.

Coding Guidelines

Inclusion Criteria

Use Q66.50 When
  • Follow the official ICD
  • CM guidelines for coding congenital conditions, ensuring specificity in documentation and coding based on clinical findings and associated conditions

Exclusion Criteria

Do NOT use Q66.50 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

29580CPT Code

Application of a foot orthosis

Clinical Scenario

Used in conjunction with Q66.50 for management of flatfoot symptoms.

Documentation Requirements

Document the need for orthotic intervention based on clinical findings.

Specialty Considerations

Pediatric specialists should ensure proper fitting and follow-up for orthotic devices.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 allows for more specific coding of congenital conditions, improving the accuracy of data collection and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 allows for more specific coding of congenital conditions, improving the accuracy of data collection 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 difference between flexible and rigid flatfoot?

Flexible flatfoot is characterized by a normal arch when the foot is not bearing weight, while rigid flatfoot shows no arch even when the foot is off the ground. Treatment options may differ based on the type.