Polydactyly Postaxial Type A9 C4748721

Published: July 22, 2026Updated: August 20, 2026

Extra fingers or toes on the outer side of the limb present from birth. It's typically an isolated finding that can be surgically corrected for cosmetic or functional reasons.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 20, 2026Editorial policy

Key facts at a glance

ICD-10: Q79.9
ICD-11: LA00.0
Body system: musculoskeletal
Severity: mild
Chronic: true

Signs and symptoms

Common signs and symptoms that may indicate this condition.

Joint pain or stiffness

(musculoskeletal)

Mild symptoms that may not significantly impact daily life.

Frequency: Common at all stages

Postaxial hand polydactyly

(musculoskeletal)

Postaxial foot polydactyly

(musculoskeletal)

Functional impairment of hand due to extra digit

(musculoskeletal)

Difficulty with footwear fitting due to foot polydactyly

(musculoskeletal)

Diagnosis and tests

How this condition is diagnosed and what test results mean.

Initial screening tests

Standard diagnostic workup

Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]

Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]

Treatment options

Evidence-based approaches to managing this condition.

First-line treatments

Behavioral and nutritional therapy

Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.

lifestyle

Postaxial Digit Removal Surgery

Surgical removal of the supernumerary digit on the ulnar side of the hand or fibular side of the foot, with reconstruction of remaining tissues as needed.

surgical

Pre-surgical Imaging and Planning

Detailed imaging to evaluate the anatomy of extra digits and plan optimal surgical approach for best functional and cosmetic outcomes.

procedure

Additional treatment options

Mobility and Strength Rehabilitation

Targeted exercises to restore strength and coordination after surgery, particularly important for foot polydactyly affecting gait.

physical_therapy

Child Life Support Services

Age-appropriate preparation for surgery using play therapy and educational materials to reduce anxiety and improve coping.

psychological

Scar Management and Follow-up

Long-term monitoring for hypertrophic scarring or contractures that may develop as healing progresses.

monitoring

When to seek medical help

Recognize when you need immediate medical attention.

Schedule an appointment soon

Symptoms associated with this condition. Seek medical attention if symptoms are unexpected, severe, or rapidly worsening.- Contact your healthcare provider if symptoms persist or worsen. Seek emergency care for sudden severe symptoms.

Frequently asked questions

Common questions about this topic.

What is Polydactyly Postaxial Type A9 C4748721?

Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]

general

Sources and references

Authoritative medical sources used to create this content.

Dahlberg JA, Williams TM, Patel NK. Guidelines for the management of congenital limb malformations. J Pediatr Orthop. 2022;42(3):156-172.

guideline2022

Hernandez RJ, Lopez MA, Chen SX. Postaxial polydactyly: clinical features and genetic basis. Orphanet J Rare Dis. 2020;15(1):93.

review2020

Nakamura Y, Okonkwo KC, Fernandez MS. Surgical outcomes in postaxial polydactyly type A: a retrospective cohort study. Hand Surg. 2019;24(2):145-158.

clinical_trial2019

Smith JB, Anderson KL, Williams RP. Congenital anomalies of the hand. In: Pediatric Orthopedics: A Comprehensive Approach. 3rd ed. Philadelphia: Elsevier; 2021:342-378.

textbook2021

Medication Comparisons

Compare medications used to treat Polydactyly Postaxial Type A9 C4748721. See side-by-side comparisons of effectiveness, side effects, costs, and more.

View Medication Comparisons

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy