M35.81
Multisystem inflammatory syndrome
Clinical Classification Guidelines
Use Additional Code
- code, if applicable, for:
- exposure to COVID-19 or SARS-CoV-2 infection (Z20.822)
- personal history of COVID-19 (Z86.16)
- post COVID-19 condition (U09.9)
Inclusion Terms
- MIS-A
- MIS-C
- Multisystem inflammatory syndrome in adults
- Multisystem inflammatory syndrome in children
- Pediatric inflammatory multisystem syndrome
- PIMS
Code First
- , if applicable, COVID-19 (U07.1)
Code Also
- any associated complications such as:
- acute hepatic failure (K72.0-)
- acute kidney failure (N17.-)
- acute myocarditis (I40.-)
- acute respiratory distress syndrome (J80)
- cardiac arrhythmia (I47-I49.-)
- pneumonia due to COVID-19 (J12.82)
- severe sepsis (R65.2-)
- viral cardiomyopathy (B33.24)
- viral pericarditis (B33.23)
Medical Intelligence & Overview
Multisystem Inflammatory Syndrome (MIS) is a rare but serious condition that affects multiple organ systems in the body. It is characterized by widespread inflammation that can involve the heart, lungs, kidneys, brain, skin, and gastrointestinal organs. This syndrome has been observed in both children and adults following infections like COVID-19. Recognized under various terms—such as MIS-C in children, MIS-A in adults, Pediatric Inflammatory Multisystem Syndrome (PIMS), and others—it requires prompt recognition and treatment to prevent severe health outcomes.
Causes & Symptoms
Clinical Causes: Prior infection with certain viruses, notably SARS-CoV-2 (the virus responsible for COVID-19) Immune system overreaction following a viral infection Genetic and environmental factors may influence susceptibility
Key Symptoms: Fever lasting several days Muscle and joint pain Rash or skin changes Abdominal pain, diarrhea, or vomiting Conjunctivitis (red, inflamed eyes) Respiratory difficulties Fatigue or lethargy Swelling of lymph nodes Cardiac symptoms such as chest pain or shortness of breath Neurological symptoms like headache, confusion, or irritability
Diagnostic & Treatment
Diagnosis Path: Diagnosing MIS involves a combination of clinical evaluation and laboratory testing. Healthcare providers may look for evidence of inflammation through blood tests, including elevated C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR). Additional evaluations include imaging studies (such as echocardiograms) to assess heart function, and tests to identify past viral infections, particularly antibodies indicating prior exposure. Given the overlap with other conditions, ruling out infections and other causes is essential for an accurate diagnosis.
Treatment Protocols: Hospitalization for close monitoring and supportive care Use of anti-inflammatory medications such as corticosteroids Immunomodulatory therapies like intravenous immunoglobulin (IVIG) or biologics Supportive treatments, including oxygen therapy, fluids, and medications to manage blood pressure Monitoring cardiac function and addressing any complications promptly
Clinical Advice & FAQs
Billing Guidance
Is M35.81 a billable ICD-10 code?
Yes, M35.81 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report M35.81?
Clinical documentation must specify the nature of Multisystem inflammatory syndrome and any associated comorbidities for accurate reporting.
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