M61.145
Myositis ossificans progressiva, left finger(s)
Clinical Classification Guidelines
Medical Intelligence & Overview
Myositis ossificans progressiva, also known as fibrodysplasia ossificans progressiva (FOP), is an extremely rare genetic disorder characterized by the abnormal development of bone tissue outside of the normal skeleton. When this condition affects the fingers, it can lead to progressive ossification—hardening and calcification—of muscles, tendons, and ligaments, resulting in restricted movement and deformity. The ICD-10 code M61.145 specifically identifies this condition when it involves the left fingers.
Causes & Symptoms
Clinical Causes: Genetic mutation: FOP is caused by a mutation in the ACVR1 gene, which controls bone growth and development. Inheritance pattern: It is inherited in an autosomal dominant manner, meaning only one copy of the mutated gene is necessary for the disorder to develop. Spontaneous mutation: In some cases, the condition results from a new (de novo) mutation with no previous family history.
Key Symptoms: Progressive ossification of soft tissues in the fingers leading to stiffness and deformity. Limited mobility in the affected finger(s), making everyday tasks difficult. Swelling and soreness in muscles or soft tissues affected during flare-ups. Malformed or shortened fingers due to abnormal bone growth. Potential complications include joint fusion and reduced overall hand function.
Diagnostic & Treatment
Diagnosis Path: Diagnosis is primarily based on clinical evaluation combined with radiographic imaging. Medical professionals look for characteristic features such as abnormal bone growth in soft tissues and finger deformities. Genetic testing can confirm the presence of mutations in the ACVR1 gene. Imaging techniques, including X-rays, may reveal heterotopic bone formation that has progressively developed over time. Early diagnosis is crucial to manage symptoms and prevent complications.
Treatment Protocols: Currently, there is no cure for FOP, and treatment focuses on managing symptoms and preventing flare-ups. Approaches may include:
Clinical Advice & FAQs
Billing Guidance
Is M61.145 a billable ICD-10 code?
Yes, M61.145 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report M61.145?
Clinical documentation must specify the nature of Myositis ossificans progressiva, left finger(s) and any associated comorbidities for accurate reporting.
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