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Duplication Of Phalanx Of 5th Finger C4021354

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

Duplication of the 5th finger phalanx is a congenital hand difference where an extra bone segment forms in the little finger. This type of polydactyly typically appears at birth and may affect one or both hands. Treatment, when needed, usually involves surgery to improve hand function or appearance.

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

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.

Extra little finger phalanx (polydactyly of 5th finger)

(musculoskeletal)

Joint pain or stiffness

(musculoskeletal)

Mild symptoms that may not significantly impact daily life.

Frequency: Common at all stages

Clinodactyly (curvature of the 5th finger)

(musculoskeletal)

Reduced grip strength

(musculoskeletal)

Intermittent pain in duplicated digit

(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

Healthy lifestyle changes and stress management

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

lifestyle
2

Polydactyly excision

Surgical removal of the duplicated phalanx typically performed in early childhood. Procedure aims to create a cosmetically normal and functional fifth digit.

surgical
3

Post-surgical hand therapy

Guided exercises after surgical excision to maintain finger mobility, prevent stiffness, and ensure proper healing of the remaining digit.

physical_therapy

Additional treatment options

Longitudinal hand function assessment

Periodic evaluation of grip strength, dexterity, and any emerging compensatory patterns as the child develops.

monitoring

Pediatric adjustment counseling

Support for the child and family addressing concerns about the hand difference before and after surgery. Promotes positive body image.

psychological

Activity modification guidance

Recommendations for protecting the hand during sports and activities that risk injury to the fifth finger during recovery and development.

lifestyle

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 Duplication Of Phalanx Of 5th Finger C4021354?

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

Goldberg MJ, Baecher NL. Upper Extremity Congenital Malformations: Guidelines for Evaluation and Management. J Pediatr Orthop. 2022.

guideline2022
2

Tomaszewski R, Gładki T, Singh MN. Ulnar-sided polydactyly: A comprehensive review of classification and surgical management. Hand Surg. 2020.

review2020
3

Bae DS, Waters PM, Chang BL. Functional outcomes after surgical treatment of fifth finger polydactyly: A retrospective analysis. J Hand Surg Am. 2019.

clinical_trial2019
4

Liu EH, Al-Qattan MM, Phillips JH. Postaxial polydactyly: A meta-analysis of surgical techniques and outcomes. Plast Reconstr Surg Glob Open. 2021.

meta_analysis2021

Medication Comparisons

Compare medications used to treat Duplication Of Phalanx Of 5th Finger C4021354. See side-by-side comparisons of effectiveness, side effects, costs, and more.

View Medication Comparisons

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