Abnormal Fourth Toe Morphology C4023906
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.
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
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
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.
Dietary counseling and physical activity plan
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
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.
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.
lifestyleOrthotic Device Fitting
Custom orthotic devices or toe spacers to provide support, improve alignment, and reduce discomfort associated with abnormal fourth toe morphology.
procedureCorrective Toe Surgery
Surgical intervention to realign or reconstruct the fourth toe when conservative measures fail and functional impairment or significant pain is present.
surgicalWhen 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 Abnormal Fourth Toe Morphology C4023906?
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.
Johnson RK, Smith JA, Chen WH. Congenital toe malformations: A comprehensive review of clinical presentations and management. Foot Ankle Int. 2022.
American College of Foot and Ankle Surgeons. Practice guidelines for the evaluation and treatment of pediatric foot deformities. J Foot Ankle Surg. 2020.
Martinez LB, Patel MN, Okonkwo HC. Surgical outcomes of fourth toe abnormalities: A prospective cohort study. Clin Orthop Relat Res. 2019.
Lee SH, Anderson PA, Fernandez AM. Genetic and environmental factors in toe malformations: A systematic review and meta-analysis. Birth Defects Res A. 2021.
Medication Comparisons
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View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
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