Skip to content

Abnormal Fourth Toe Morphology C4023906

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

This involves structural differences in the fourth toe, typically present from birth. Most cases are mild and do not cause problems. Treatment is only needed if function is affected.

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.

Warning signs - seek immediate care

!

Toe skin infection

Bacterial or fungal infection of the toe skin or nail, presenting with redness, warmth, pus, foul odor, or drainage.

Seek immediate medical care if you develop fever, rapidly spreading redness, severe pain, or pus drainage, as untreated infection can spread.

Fourth toe deformity

(musculoskeletal)

Visible abnormality in the shape or structure of the fourth toe, which may appear curved, overlapping, or misaligned.

Frequency: 90-100% of patients

Toe pain

(musculoskeletal)

Pain or discomfort in the affected fourth toe, often worsened by walking, standing, or wearing tight footwear.

Frequency: 70-80% of patients

Difficulty walking

(musculoskeletal)

Altered gait pattern or difficulty walking normally due to abnormal toe positioning or pain.

Frequency: 50-60% of patients

Corns or calluses

(dermatologic)

Thickened, hardened skin areas developing on the toe due to repeated friction or pressure from footwear.

Frequency: 40-50% of patients

Ingrown toenail

(dermatologic)

Nail edge growing into the surrounding skin, causing pain, redness, and potential infection.

Frequency: 30-40% of patients

Reduced toe movement

(musculoskeletal)

Limited range of motion in the fourth toe joint, making it difficult to flex or extend the toe fully.

Frequency: 40-50% of patients

Toe swelling

(musculoskeletal)

Swelling or puffiness around the fourth toe, often accompanied by visible enlargement of the joint.

Frequency: 35-45% of patients

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

Clinical Observation

Regular monitoring with periodic clinical examinations and imaging to track any progression of toe morphology abnormalities. Appropriate for mild cases without functional impairment.

monitoring
2

Dietary counseling and physical activity plan

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

lifestyle
3

Foot and Toe Exercises

Targeted physical therapy exercises to improve toe mobility, strength, and function. May include toe spreading, picking up objects, and gait training exercises.

physical_therapy

Additional treatment options

Proper Footwear Selection

Use of wide-toe-box shoes and avoidance of constrictive footwear to prevent exacerbation of abnormal toe morphology. Custom orthopedic footwear may be recommended.

lifestyle

Orthotic Device Fitting

Custom orthotic devices or toe spacers to provide support, improve alignment, and reduce discomfort associated with abnormal fourth toe morphology.

procedure

Corrective Toe Surgery

Surgical intervention to realign or reconstruct the fourth toe when conservative measures fail and functional impairment or significant pain is present.

surgical

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 Abnormal Fourth Toe Morphology C4023906?

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

Johnson RK, Smith JA, Chen WH. Congenital toe malformations: A comprehensive review of clinical presentations and management. Foot Ankle Int. 2022.

review2022
2

American College of Foot and Ankle Surgeons. Practice guidelines for the evaluation and treatment of pediatric foot deformities. J Foot Ankle Surg. 2020.

guideline2020
3

Martinez LB, Patel MN, Okonkwo HC. Surgical outcomes of fourth toe abnormalities: A prospective cohort study. Clin Orthop Relat Res. 2019.

clinical_trial2019
4

Lee SH, Anderson PA, Fernandez AM. Genetic and environmental factors in toe malformations: A systematic review and meta-analysis. Birth Defects Res A. 2021.

meta_analysis2021

Medication Comparisons

Compare medications used to treat Abnormal Fourth Toe Morphology C4023906. 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 25, 2026. · Read our editorial policy