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v1.0.0
ICD-10 Guide
ICD-10 CodesQ66.91

Q66.91

Billable

Congenital deformity of feet, unspecified, right foot

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

Code Description

ICD-10 Q66.91 is a billable code used to indicate a diagnosis of congenital deformity of feet, unspecified, right foot.

Key Diagnostic Point:

Congenital deformities of the feet can encompass a wide range of structural abnormalities that may affect the bones, muscles, and soft tissues. The unspecified nature of this code indicates that the specific type of deformity has not been clearly defined. Common congenital foot deformities include clubfoot (talipes equinovarus), flatfoot (pes planus), and metatarsus adductus. These conditions can lead to functional impairments and may require surgical intervention or orthotic management. The right foot designation indicates that the deformity is localized to that side, which is crucial for treatment planning. In pediatric patients, early diagnosis and intervention are essential to improve outcomes and prevent complications such as gait abnormalities and pain. The management of congenital foot deformities often involves a multidisciplinary approach, including pediatricians, orthopedic surgeons, and physical therapists, to ensure comprehensive care and optimal functional results.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in presentation and severity of foot deformities
  • Need for precise documentation of the specific type of deformity
  • Potential for associated conditions that may complicate coding
  • Variations in treatment protocols based on the specific deformity

Audit Risk Factors

  • Inadequate documentation of the specific type of deformity
  • Failure to note associated conditions or syndromes
  • Misuse of unspecified codes when more specific codes are available
  • Inconsistent coding across different healthcare providers

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Documentation must include a detailed description of the deformity, any associated conditions, and treatment plans.

Common Clinical Scenarios

Pediatric patients presenting with foot deformities during routine check-ups or referrals from primary care.

Billing Considerations

Consideration of developmental milestones and functional outcomes in pediatric patients.

Genetics

Documentation Requirements

Genetic evaluation may be necessary to rule out syndromic causes of foot deformities.

Common Clinical Scenarios

Patients with a family history of congenital malformations or those presenting with multiple congenital anomalies.

Billing Considerations

Documentation should include genetic testing results and implications for family counseling.

Coding Guidelines

Inclusion Criteria

Use Q66.91 When
  • Follow the official ICD
  • CM coding guidelines for congenital conditions, ensuring accurate documentation of the deformity and any associated anomalies
  • Use additional codes as necessary to capture the full clinical picture

Exclusion Criteria

Do NOT use Q66.91 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

28485CPT Code

Correction of clubfoot

Clinical Scenario

Used in surgical correction of clubfoot deformity.

Documentation Requirements

Pre-operative assessment, surgical notes, and post-operative follow-up.

Specialty Considerations

Orthopedic surgeons must document the specific technique used.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed 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 has allowed 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 documentation is needed to support the use of Q66.91?

Documentation should include a clear description of the foot deformity, any associated conditions, treatment plans, and follow-up evaluations to ensure accurate coding and compliance.