Polydactyly Postaxial Type A7 C4539976
A condition where extra fingers or toes develop on the outer side of the hand or foot from birth. Most cases are isolated and don't cause major problems, often treated with surgical removal of the extra digit.
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 hexadactyly with duplicated metacarpal
(musculoskeletal)Altered hand contour affecting daily activities
(musculoskeletal)Pain in the extra digit during cold weather
(musculoskeletal)Associated lower limb skeletal anomalies
(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
Definitive Surgical Excision
Complete removal of the extra digit with careful soft tissue reconstruction and wound closure.
Lifestyle modification and dietary intervention
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Additional treatment options
Developmental Milestone Tracking
Regular assessment of motor development and hand/foot function throughout early childhood.
monitoringSpecialist Referral and Evaluation
Referral to pediatric orthopedic or hand surgery specialist for comprehensive evaluation and planning.
procedureSensory-Motor Integration Therapy
Therapeutic exercises to improve proprioception, fine motor control, and bilateral hand coordination.
physical_therapyParental Education and Home Care Training
Education program for caregivers on wound care, activity restrictions, and signs of complications.
lifestyleWhen 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 A7 C4539976?
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.
Johnson RK, Williams PL. Guidelines for the management of congenital hand anomalies including postaxial polydactyly. J Hand Surg Guidelines. 2022.
Chen MH, Lopez AB, Davis SD. Postaxial polydactyly: clinical features, genetic associations, and surgical management. Plast Reconstr Surg. 2020.
Patel NM, Thompson CJ, Kim SH. Comparative outcomes of surgical techniques for postaxial polydactyly: a prospective study. J Pediatr Orthop. 2019.
Anderson JM, Roberts CC, Martinez FX. Genetic basis and molecular pathways in postaxial polydactyly development: a systematic review. Am J Med Genet A. 2021.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy