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M79.1 Myalgia – Muscle Pain: Causes & Treatment
M79.1 is the ICD-10 code for myalgia (muscle pain). It describes pain in one or more muscles without a clearly identified underlying disease.
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M79.1 is the ICD-10 code for myalgia (muscle pain). It describes pain in one or more muscles without a clearly identified underlying disease.
What does ICD-10 Code M79.1 mean?
The ICD-10 code M79.1 stands for myalgia – the medical term for muscle pain. This code is used when a person experiences pain in one or more muscles without a clearly identifiable underlying condition. Myalgia is one of the most common complaints seen in general medical practice.
Causes
Muscle pain can have many different causes. Common triggers include:
- Overexertion and delayed onset muscle soreness (DOMS): Intense or unaccustomed physical activity frequently leads to temporary muscle pain.
- Muscle tension: Stress, poor posture, or prolonged sitting can cause muscular tension and pain.
- Infectious diseases: Viral illnesses such as influenza or COVID-19 often present with muscle pain as an accompanying symptom.
- Medication side effects: Certain drugs, particularly statins (cholesterol-lowering medications), can cause myalgia.
- Metabolic disorders: Conditions such as hypothyroidism (underactive thyroid) or electrolyte imbalances can trigger muscle pain.
- Rheumatological conditions: Disorders like fibromyalgia or polymyalgia rheumatica are associated with pronounced muscle pain.
- Psychosocial factors: Stress, anxiety, and depression can manifest physically through muscle pain.
Symptoms
Symptoms associated with M79.1 can vary depending on the underlying cause. Typical features include:
- Dull, pulling, or burning pain in one or more muscles
- Tenderness on palpation of the affected muscle
- Restricted movement due to pain
- Fatigue and general malaise (particularly with infectious causes)
- Stiffness, especially in the morning
Diagnosis
The diagnosis of myalgia is primarily clinical, based on medical history and physical examination. Depending on the suspected cause, the following investigations may be carried out:
- Blood tests: Measurement of inflammatory markers (CRP, ESR), muscle enzymes (CK – creatine kinase), thyroid function, and electrolytes
- Imaging: Ultrasound or MRI of the affected muscles when structural changes are suspected
- Electromyography (EMG): Measurement of the electrical activity of muscles when a neuromuscular disorder is suspected
- Biopsy: In rare cases, a muscle biopsy may be necessary
Treatment
Treatment is directed at the underlying cause. General measures for myalgia include:
Conservative Measures
- Physical rest and adequate recovery
- Heat application (heat patches, hot water bottle) to relax muscles
- Gentle stretching and mobility exercises
- Physiotherapy and massage
Pharmacological Treatment
- Pain relievers: Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac, and paracetamol (acetaminophen)
- Muscle relaxants: Muscle-relaxing medications may be used in cases of severe tension
- Treatment of the underlying condition: If medication is the cause, switching to an alternative drug may be necessary; infectious causes are treated appropriately
When to See a Doctor
The following warning signs require medical evaluation:
- Severe, persistent, or worsening muscle pain without an obvious cause
- Accompanying swelling, redness, or warmth over the muscle
- Muscle wasting or significant loss of strength
- Dark-coloured urine (possible sign of rhabdomyolysis)
- Fever and pronounced general symptoms of illness
References
- World Health Organization (WHO): International Classification of Diseases, 10th Revision (ICD-10), Chapter XIII – Diseases of the musculoskeletal system and connective tissue (M00–M99).
- Sommer C. et al.: Myalgia – Differential diagnosis and therapy. Deutsches Arzteblatt International, 2012; 109(42): 722–730.
- Dalakas M.C.: Toxic and drug-induced myopathies. Journal of Neurology, Neurosurgery & Psychiatry, 2009; 80(8): 832–838.
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