Acquired Idiopathic Inflammatory Myopathy Cn305781
An autoimmune disease causing muscle inflammation and weakness. Affects adults and may involve skin rashes. Treated with immunosuppressant medications and physical therapy.
Key facts at a glance
- ICD-10
- M35.9
- ICD-11
- FA00.0
- Body system
- musculoskeletal
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Interstitial lung disease
Cardiac involvement (myocarditis)
Joint pain or stiffness
(musculoskeletal)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Proximal muscle weakness
(musculoskeletal)Gottron's papules (skin rash)
(musculoskeletal)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
Corticosteroid Therapy
High-dose corticosteroids remain first-line immunosuppressive therapy for rapidly controlling inflammatory muscle disease. Gradual tapering follows initial disease control to minimize side effects.
Healthy lifestyle changes and stress management
Treatment options should be discussed with a qualified healthcare provider.
Steroid-Sparing Immunosuppression
Agents such as methotrexate, azathioprine, or mycophenolate allow corticosteroid dose reduction while maintaining disease control. Onset of action is delayed compared to steroids.
Additional treatment options
Guided Exercise and Rehabilitation
Supervised physical therapy with gentle range-of-motion exercises and gradual strengthening prevents muscle atrophy while avoiding overexertion during active inflammation. Improves functional outcomes.
physical_therapyCreatine Kinase and Disease Activity Monitoring
Serial measurement of muscle enzymes and clinical assessment guides treatment decisions and detects disease flares early. Imaging may supplement laboratory monitoring.
monitoringVitamin D and Calcium Supplementation
Bone health support with vitamin D and calcium helps counteract corticosteroid-induced osteoporosis. Supplementation should be combined with weight-bearing exercise when possible.
complementaryWhen 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 Acquired Idiopathic Inflammatory Myopathy Cn305781?
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.
Lundberg IE, Tjarnlund A, Bottai M, et al. 2017 European League Against Rheumatism/American College of Rheumatology classification criteria for adult and juvenile idiopathic inflammatory myopathies. Ann Rheum Dis. 2021.
Dalakas MC. Inflammatory muscle diseases. N Engl J Med. 2015.
Gordon PA, Chin WW, Winer JB. A systematic review of the comparative effectiveness of immunosuppressive therapies for inflammatory myopathies. J Neurol. 2019.
Selva-O'Callaghan A, Pinal-Fernandez I, Trallero-Araguas E, Milisenda JC. Classification and management of adult inflammatory myositis. Nat Rev Rheumatol. 2022.
Medication Comparisons
Compare medications used to treat Acquired Idiopathic Inflammatory Myopathy Cn305781. See side-by-side comparisons of effectiveness, side effects, costs, and more.
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.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy