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M45.0 - Ankylosing Spondylitis (Bechterew Disease)
M45.0 is the ICD-10 code for ankylosing spondylitis, a chronic inflammatory disease affecting the spine and sacroiliac joints, leading to progressive stiffness.
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M45.0 is the ICD-10 code for ankylosing spondylitis, a chronic inflammatory disease affecting the spine and sacroiliac joints, leading to progressive stiffness.
What Does the Diagnosis M45.0 Mean?
The ICD-10 code M45.0 refers to ankylosing spondylitis (AS), also known as Bechterew disease. It is a chronic inflammatory rheumatic condition that primarily affects the spine and the sacroiliac joints (the joints connecting the spine to the pelvis). Over time, the inflammation can lead to progressive fusion and stiffening of the vertebrae. Ankylosing spondylitis belongs to a broader group of conditions called spondyloarthropathies and typically begins in young adulthood.
Causes and Risk Factors
The exact cause of ankylosing spondylitis is not fully understood, but it is considered an autoimmune disease in which the immune system mistakenly attacks the body's own tissues. Key contributing factors include:
- Genetic predisposition: Around 90% of people with AS carry the HLA-B27 gene marker, although not everyone with this marker develops the disease.
- Family history: Having a close relative with AS significantly increases the risk.
- Environmental triggers: Certain infections may act as triggers in genetically susceptible individuals.
- Sex: Men are more frequently and more severely affected than women, though women can also develop the condition.
Symptoms
Symptoms typically develop gradually and may be mistaken for common back pain in the early stages. Key symptoms include:
- Chronic low back and buttock pain, particularly worse in the morning or after periods of rest (inflammatory-type back pain)
- Morning stiffness of the spine, which improves with movement and exercise
- Progressive loss of spinal mobility
- Pain in the hips, shoulders, or knees
- Enthesitis: Inflammation at tendon and ligament attachment points, such as the heel
- Fatigue and general malaise
- Extra-articular manifestations such as uveitis (eye inflammation), inflammatory bowel disease, or psoriasis (skin condition)
Diagnosis
Diagnosing ankylosing spondylitis involves a combination of clinical assessment, imaging, and laboratory tests:
- Clinical history and physical examination: Evaluation of spinal mobility, pain characteristics, and symptom duration
- Imaging: X-rays of the sacroiliac joints; MRI (Magnetic Resonance Imaging) for early detection of inflammation before structural damage appears on X-ray
- Laboratory tests: Testing for the HLA-B27 antigen; measurement of inflammatory markers such as CRP (C-reactive protein) and ESR (erythrocyte sedimentation rate)
- Classification criteria: Modified New York criteria or ASAS criteria for axial spondyloarthritis are commonly used
Treatment
There is currently no cure for ankylosing spondylitis, but effective treatment can significantly reduce symptoms, slow disease progression, and preserve quality of life.
Pharmacological Treatment
- Non-steroidal anti-inflammatory drugs (NSAIDs): First-line therapy for pain and inflammation relief (e.g., ibuprofen, diclofenac, naproxen)
- Biologics: For patients not responding adequately to NSAIDs, TNF-alpha inhibitors (e.g., adalimumab, etanercept) or IL-17 inhibitors (e.g., secukinumab) are used
- JAK inhibitors: A newer class of targeted drugs available for certain patients
- Corticosteroids: May be used as local injections or short-term systemic therapy during flares
Non-Pharmacological Treatment
- Physiotherapy and exercise: Regular, structured physical therapy is essential to maintain spinal flexibility and posture
- Occupational therapy: Adaptations to daily life and the workplace to reduce strain
- Physical activity: Swimming, cycling, and other low-impact exercises are strongly recommended
- Heat therapy: Can help relieve muscle tension and pain
Surgical Treatment
In severe cases with significant joint damage and functional impairment, surgical interventions such as joint replacement (arthroplasty) may be considered, particularly for the hip joints.
Prognosis and Course
The progression of ankylosing spondylitis varies greatly between individuals. Some people experience only mild symptoms throughout their lives, while others develop significant spinal fusion and disability. Early diagnosis combined with consistent treatment greatly improves long-term outcomes. Regular follow-up with a rheumatologist is strongly recommended.
References
- Sieper J. et al. - Ankylosing Spondylitis: An Overview. Annals of the Rheumatic Diseases, 2002; 61(Suppl 3): iii8-iii18. PubMed.
- van der Linden S. et al. - Evaluation of Diagnostic Criteria for Ankylosing Spondylitis. Arthritis & Rheumatism, 1984; 27(4): 361-368.
- Ward M.M. et al. - 2019 Update of the American College of Rheumatology/Spondylitis Association of America/Spondyloarthritis Research and Treatment Network Recommendations for the Treatment of Ankylosing Spondylitis and Nonradiographic Axial Spondyloarthritis. Arthritis & Rheumatology, 2019; 71(10): 1599-1613.
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