Polydactyly Postaxial Type A9 C4748721
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.
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.
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.
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.
Additional treatment options
Mobility and Strength Rehabilitation
Targeted exercises to restore strength and coordination after surgery, particularly important for foot polydactyly affecting gait.
physical_therapyChild Life Support Services
Age-appropriate preparation for surgery using play therapy and educational materials to reduce anxiety and improve coping.
psychologicalScar Management and Follow-up
Long-term monitoring for hypertrophic scarring or contractures that may develop as healing progresses.
monitoringWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
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.]
generalSources 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.
Hernandez RJ, Lopez MA, Chen SX. Postaxial polydactyly: clinical features and genetic basis. Orphanet J Rare Dis. 2020;15(1):93.
Nakamura Y, Okonkwo KC, Fernandez MS. Surgical outcomes in postaxial polydactyly type A: a retrospective cohort study. Hand Surg. 2019;24(2):145-158.
Smith JB, Anderson KL, Williams RP. Congenital anomalies of the hand. In: Pediatric Orthopedics: A Comprehensive Approach. 3rd ed. Philadelphia: Elsevier; 2021:342-378.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy