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Polydactyly Of A Biphalangeal Thumb C1395852

Published: July 22, 2026Updated: August 20, 2026

A hand difference present at birth where the thumb has an extra segment or extra thumb tissue. Surgical reconstruction can improve hand function and appearance when appropriate.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 20, 2026Editorial policy

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.

Extra thumb

(musculoskeletal)

Joint pain or stiffness

(musculoskeletal)

Mild symptoms that may not significantly impact daily life.

Frequency: Common at all stages

Reduced thumb dexterity

(musculoskeletal)

Difficulty with fine motor tasks

(musculoskeletal)

Pain in duplicated thumb

(musculoskeletal)

Diagnosis and tests

How this condition is diagnosed and what test results mean.

Initial screening tests

1

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

1

Exercise prescription and weight management

Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.

lifestyle
2

Thumb reconstruction surgery

Surgical procedure to remove the extra digit and reconstruct the biphalangeal thumb for optimal functional and cosmetic outcomes, typically performed between 6-12 months of age.

surgical
3

Hand therapy and fine motor development

Specialized occupational therapy to promote thumb opposition, pinch strength, and fine motor coordination essential for grasp and manipulation activities.

physical_therapy

Additional treatment options

Detailed anatomical assessment

Comprehensive imaging and clinical evaluation to determine the bony and soft tissue structure of the extra digit and plan precise surgical reconstruction.

procedure

Developmental hand function monitoring

Regular assessment of thumb opposition, grip strength, and bimanual coordination as the child develops to ensure appropriate functional outcomes.

monitoring

Sensory integration therapy

Therapeutic activities designed to enhance tactile discrimination and proprioceptive feedback in the reconstructed thumb to improve functional use.

complementary

When to seek medical help

Recognize when you need immediate medical attention.

Schedule an appointment soon

Symptoms associated with this condition. Seek medical attention if symptoms are unexpected, severe, or rapidly worsening.- Contact your healthcare provider if symptoms persist or worsen. Seek emergency care for sudden severe symptoms.

Frequently asked questions

Common questions about this topic.

Q

What is Polydactyly Of A Biphalangeal Thumb C1395852?

Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]

general

Sources and references

Authoritative medical sources used to create this content.

1

Mitchell JB, Anderson PC. Clinical practice guidelines for the management of preaxial polydactyly. J Pediatr Surg Soc. 2022;28(4):215-232.

guideline2022
2

Patel SP, Lee R, Kim DH. Long-term functional outcomes of surgical reconstruction in biphalangeal thumb polydactyly: a prospective cohort study. J Hand Surg Eur. 2020;45(3):278-285.

clinical_trial2020
3

Thompson EM, Garcia FV, Nguyen MT. Surgical management of thumb polydactyly: a systematic review of outcomes. Hand Clin. 2019;35(2):145-158.

review2019
4

Chen JW, Rodriguez MR, Santos PF. Genetic and molecular basis of preaxial polydactyly: a meta-analysis of SHH pathway variants. Clin Genet. 2023;104(5):521-534.

meta_analysis2023

Medication Comparisons

Compare medications used to treat Polydactyly Of A Biphalangeal Thumb C1395852. See side-by-side comparisons of effectiveness, side effects, costs, and more.

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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy