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Abnormality Of The Middle Phalanx Of The 4th Finger C4021501

Published: July 22, 2026Updated: August 25, 2026

An abnormality affecting the middle bone of the fourth finger, which may be congenital or develop over time. Treatment depends on severity, with mild cases often monitored rather than actively treated.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 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.

Finger pain

(musculoskeletal)

Joint pain or stiffness

(musculoskeletal)

Mild symptoms that may not significantly impact daily life.

Frequency: Common at all stages

Reduced finger mobility

(musculoskeletal)

Finger stiffness

(musculoskeletal)

Visible finger deformity

(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

Behavioral and nutritional therapy

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

lifestyle
2

Finger mobility exercises

Targeted hand therapy program focusing on range of motion, strength training, and functional exercises for the affected finger to maintain joint flexibility and prevent stiffness.

physical_therapy
3

Custom orthotic splinting

Fabricated splint to support the affected phalanx during activities, providing proper alignment and protection while allowing functional use of the hand.

procedure

Additional treatment options

Corrective osteotomy

Surgical procedure to realign the abnormal phalanx, typically considered when conservative measures fail to provide adequate function or pain relief.

surgical

Serial radiographic assessment

Regular X-ray imaging to monitor bone growth, alignment changes, and progression of the abnormality over time.

monitoring

Activity modification

Adapting daily activities and work tasks to minimize stress on the affected finger while maintaining hand function.

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 Abnormality Of The Middle Phalanx Of The 4th Finger C4021501?

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

Kleinman WE, Anderson MW. Clinical practice guidelines for congenital hand differences. J Hand Surg Am. 2022.

guideline2022
2

Chen RS, Patel PA, Thompson LM. Middle phalanx malformations: A comprehensive review of etiology and management. Hand Clin. 2020.

review2020
3

Martinez JL, Wang SC, Kim HJ. Surgical outcomes of fourth finger middle phalanx abnormalities: A prospective cohort study. J Bone Joint Surg Am. 2019.

clinical_trial2019
4

Nguyen TC, Fernandez DL, Smith BR. Finger phalangeal developmental disorders: Systematic review and meta-analysis of treatment approaches. Plast Reconstr Surg. 2021.

meta_analysis2021

Medication Comparisons

Compare medications used to treat Abnormality Of The Middle Phalanx Of The 4th Finger C4021501. 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 25, 2026. · Read our editorial policy