2 4 Finger Cutaneous Syndactyly C4021236
A birth defect where the skin between the second and fourth fingers is webbed together. This mild hand difference may be corrected with surgery to improve function and appearance.
Key facts at a glance
- ICD-10
- M79.9
- ICD-11
- FA00.0
- Body system
- musculoskeletal
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Fused skin extending from the second to fourth fingers
(musculoskeletal)Joint pain or stiffness
(musculoskeletal)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Impaired grip strength in the hand
(musculoskeletal)Difficulty performing fine motor tasks such as writing
(musculoskeletal)Social anxiety related to hand appearance
(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
Hand Function and Development Monitoring
Regular assessment of hand grip strength, dexterity, fine motor skills, and finger separation capabilities. Includes evaluation of any impact on writing, grasping, and daily activities.
Healthy lifestyle changes and stress management
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Hand Therapy and Finger Mobilization
Comprehensive hand therapy program including passive stretching, active exercises, and functional activities to maintain finger range of motion, prevent contractures, and optimize hand function.
Additional treatment options
Syndactyly Release Surgery with Skin Grafting
Surgical separation of webbed fingers (2nd-4th) using carefully designed flaps, with skin grafting as needed to cover exposed areas. Multiple stages may be required depending on complexity.
surgicalPsychosocial Support and Social Skills Building
Targeted psychological support addressing potential social anxiety, bullying concerns, and self-esteem issues related to visible hand differences. Includes social skills training and peer education resources.
psychologicalScar Management and Desensitization Therapy
Post-operative or preventive care including silicone therapy, massage techniques, and desensitization exercises to improve scar appearance and restore normal sensation to affected fingers.
complementaryWhen 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 2 4 Finger Cutaneous Syndactyly C4021236?
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.
Kawamoto BT, Smith ML. Surgical management of cutaneous syndactyly of the hand: a comprehensive review. Hand Surgery. 2019.
American Society for Surgery of the Hand. Guidelines for the treatment of syndactyly in children. Journal of Hand Surgery. 2021.
Patel NB, Chen RC, Liu EH. Comparative outcomes of zig-zag versus rectangular flap techniques in 2-4 finger syndactyly release. Plastic and Reconstructive Surgery. 2022.
Goldman J, McCarroll HM. Syndactyly and polysyndactyly. In: Green's Operative Hand Surgery. 8th ed. Elsevier; 2020.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy