Polydactyly Postaxial Type A4 C1837868
Postaxial type A4 polydactyly involves extra digits on the outer side of the hand or foot. Surgical correction is tailored to the individual case.
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 extra digit (ulnar side)
(musculoskeletal)Asymmetric hand appearance due to extra digit
(musculoskeletal)Functional limitation in grip due to extra digit
(musculoskeletal)Associated 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.
Surgical Excision
Surgical removal of the extra digit with reconstruction of surrounding tissues to ensure proper function and aesthetic outcome.
Additional treatment options
Clinical Observation
Regular monitoring of the extra digit's growth pattern and functional impact without immediate surgical intervention.
monitoringHand Function Rehabilitation
Post-operative exercises to improve grip strength, dexterity, and range of motion in the affected hand.
physical_therapyPsychological Counseling
Supportive counseling to address body image concerns, self-esteem issues, or anxiety related to the condition.
psychologicalDiagnostic Imaging
Pre-operative imaging studies to assess bone structure, joint involvement, and vascular-neural anatomy of the extra digit.
procedureWhen 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 A4 C1837868?
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.
Swanson J, Winter S, Adams D. Guidelines for management of congenital upper limb anomalies. J Hand Surg Am. 2022.
Chen M, Rodriguez R, Kim H. Surgical management of postaxial polydactyly: a systematic review. Clin Orthop Relat Res. 2021.
Patel V, Liu Q, Thompson R. Comparative analysis of surgical techniques for postaxial polydactyly excision in children: a prospective cohort study. J Pediatr Orthop. 2020.
Bamshad M, Wasserman C, Jorde L. Epidemiology and genetics of polydactyly. In: Emery and Rimoin's Principles and Practice of Medical Genetics. 2023.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy