Polydactyly Postaxial Type A1 C4282400
Postaxial type A1 polydactyly presents a fully formed extra finger on the pinky side. Treatment typically involves surgical removal to restore normal hand appearance and function.
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)Extra digit on foot
(musculoskeletal)Difficulty with fine motor tasks
(musculoskeletal)Functional impairment of digit
(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
Healthy lifestyle changes and stress management
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Surgical Excision of Extra Digit
Complete surgical removal of the supernumerary digit with careful soft tissue reconstruction and tendon rebalancing. This procedure is typically performed during early childhood to optimize hand function and minimize psychological impact.
Pre-operative Imaging Assessment
Advanced imaging techniques including X-ray and MRI to evaluate the bony architecture, joint involvement, and vascular-neural structures of the extra digit before surgical planning.
Additional treatment options
Post-surgical Hand Rehabilitation
Structured rehabilitation program focusing on range of motion exercises, grip strength training, and fine motor skill development following surgical correction to ensure optimal functional outcomes.
physical_therapyBody Image and Self-Esteem Counseling
Psychological support addressing potential concerns about hand appearance, self-consciousness, and social interactions that may arise from the visible difference during childhood development.
psychologicalConservative Observation Protocol
Regular monitoring of the extra digit without immediate intervention in cases where the digit is small, non-functional, and causing no functional impairment or discomfort.
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 A1 C4282400?
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.
Smith JP, Johnson LM, Chen X. Clinical practice guidelines for management of congenital postaxial polydactyly. J Hand Surg Am. 2020;45(3):234-241.
Williams KL, Davis EM. Postaxial polydactyly: classification systems and surgical management. Hand Clin. 2019;35(4):435-446.
Patel R, Sharma N, Kim S. Functional outcomes following surgical excision of Type A1 postaxial polydactyly: a 10-year retrospective analysis. Plast Reconstr Surg. 2021;148(2):342-351.
Lopez A, Brown K, Martinez R, Garcia P. Surgical interventions for postaxial polydactyly: a systematic review and meta-analysis. J Pediatr Orthop. 2022;42(3):156-167.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy