Wendy Boutilier
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Admin
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1d ·
After the PACE trial was published in 2011, psychiatry groups claimed that Cognitive Behavioural Therapy (CBT) and Graded Exercise Therapy (GET) could treat or even cure “CFS/ME.” Later independent analyses exposed serious flaws in the study’s design, data handling, and outcome reporting. Its claims were scientifically discredited, but many of the psychiatrists involved remained influential within medical institutions. Instead of acknowledging ME as a neuroimmune disease, they began promoting new diagnostic labels and reclassifying patients under other psychosomatic or “functional” labels, such as:
* MUS (Medically Unexplained Symptoms)
* FND (Functional Neurological Disorder)
* Somatic Symptom Disorder (SSD)
* Bodily Distress Syndrome (BDS)
New Psychiatric Classifications Applied to ME
Medically Unexplained Symptoms (MUS)
MUS is a broad term used when no obvious biomedical cause is found for a patient’s symptoms. Because ME patients often have normal standard test results, some clinicians reclassify them as having “MUS.” This label implies that the symptoms are exaggerated or stress-related rather than signs of underlying disease. It discourages further investigation, frames the illness as psychological, and frequently results in inappropriate referrals for CBT or “activity rehabilitation.”
Functional Neurological Disorder (FND)
FND is described as a problem in the way the brain “functions” rather than in its structure. It is sometimes used for symptoms such as paralysis, tremors, or seizures without visible lesions on scans. Some psychiatrists now describe ME neurological features—weakness, paralysis, cognitive crashes—as “functional. This interpretation ignores findings of neuroinflammation, cerebral blood-flow reduction, oxidative stress, and mitochondrial dysfunction that are documented in ME research.
Somatic Symptom Disorder (SSD)
Defined in the DSM-5, SSD is a psychiatric diagnosis given when physical symptoms cause distress and the clinician judges the person to be “excessively concerned” about health. In practice, it pathologizes legitimate suffering and advocacy for care. Many ME patients who persist in seeking help or documenting post-exertional relapses are labeled with SSD, implying that anxiety rather than biology drives their illness.
Bodily Distress Syndrome (BDS)
Developed mainly in Denmark, BDS groups conditions such as fibromyalgia, IBS, and ME/CFS under a single psychosomatic category. It claims that multiple body symptoms without “adequate explanation” represent a disorder of bodily distress. This directly contradicts the World Health Organization (WHO) classification of ME as a neurological disease and effectively erases its biomedical identity.
Why These Reclassifications Are Harmful
* They replace a neurological diagnosis with a psychiatric one, undermining the patient’s medical credibility.
* They deny access to appropriate biomedical care and testing.
* They justify psychological or behavioural interventions (CBT/GET) that have already been shown to harm many ME patients.
* They redirect research funding away from biological investigation.
* They institutionalize disbelief by framing legitimate pathology as maladaptive thinking.
Modern studies clearly demonstrate that ME involves measurable abnormalities:
* Neuroinflammation and microglial activation
* Reduced cerebral blood flow and oxygen extraction
* Mitochondrial and metabolic dysfunction
* Immune activation and autonomic dysregulation
* Post-exertional neuroimmune exhaustion (PENE)
These findings are not compatible with any “functional” or psychosomatic model.
International Recognition of ME as a Neurological Disease
World Health Organization (WHO)
* ICD-10 Code: G93.3 — Myalgic Encephalomyelitis / Post-viral Fatigue Syndrome, classified under Diseases of the Nervous System. WHO ICD-10 entry
* ICD-11 Code: 8E49 — Post-viral fatigue syndrome, remaining in the neurological chapter. WHO ICD-11 entry
WHO explicitly states that ME is a neurological condition and must not be reclassified under mental or behavioural disorders.
NICE (UK, 2021)
The NICE guideline NG206 recognises ME/CFS as a chronic, multisystem disease and specifically warns against graded exercise or any therapy presented as a cure.
“Do not offer people with ME/CFS any therapy based on physical activity or exercise as a treatment or cure.” NICE Guideline NG206
Canadian Consensus Criteria (CCC, 2003)
The CCC defines ME/CFS as a biological illness with dysfunctions in neurological, immune, endocrine, and energy systems.
“ME/CFS is not a primary psychiatric disorder. Psychiatric symptoms secondary to the illness should not result in a psychiatric primary diagnosis.” Canadian Consensus Criteria PDF
International Consensus Criteria (ICC, 2011)
Created by 26 international experts, the ICC uses the name Myalgic Encephalomyelitis to emphasize the neuroimmune nature of the disease.
“The pathophysiology is not due to deconditioning or psychiatric illness.” Carruthers et al., 2011, Journal of Internal Medicine
U.S. National Academy of Medicine (NAM, 2015)
The NAM (formerly the Institute of Medicine) concluded:
“This is not a psychiatric illness. The primary feature is an impaired ability to produce energy, with measurable abnormalities in immune and neurological systems.”NAM/IOM Report, 2015
European Concerns: Bodily Distress Syndrome (BDS)
In Denmark and parts of northern Europe, BDS continues to be promoted despite international objections. Experts such as Keith Geraghty and Frank Twisk have published analyses showing that BDS contradicts WHO coding and misclassifies neurological illness as psychosomatic.
Why the Reclassifications Are Spreading Again
Even though the scientific consensus has shifted toward a biomedical model, several forces keep the rebranding alive:
Institutional inertia. Many of the same psychiatrists behind PACE occupy senior academic and policy roles. When the evidence contradicted their theories, they rebranded them under “MUS” or “functional” terminology rather than abandoning them.
MUS and Functional Disorder Clinics. Hospitals in the UK, Denmark, and elsewhere have created clinics that combine ME, fibromyalgia, POTS, and Long Covid under the heading of “Functional Disorders.” Their goal is to reduce testing and focus on psychological management. This saves money but often leaves patients misdiagnosed and untreated.
Policy language about ‘mind–body integration.’ Health systems now emphasize “whole-person care” and “integrated pathways.” In theory that sounds positive, but in practice it often means replacing biomedical care with behavioural therapy.
Long Covid and repetition of history. Post-Covid syndromes share many biological features with ME. Some psychiatrists have tried to frame these as functional conditions, repeating the same mistakes that harmed ME patients for decades.
Patient and expert resistance. Are pressing health services to follow the WHO classifications. Biomedical researchers worldwide continue to publish findings on immune, vascular, and metabolic dysfunction that make the functional labels scientifically indefensible.
Why It Matters
Each time ME is relabeled under a psychiatric or “functional” term, patients lose credibility, medical care, and research progress. These reclassifications are not scientific advances - they are attempts to preserve outdated theories.
The modern evidence shows clearly that Myalgic Encephalomyelitis is a neuroimmune, post-infectious diseasecharacterized by metabolic and vascular abnormalities and post-exertional neuroimmune exhaustion. The World Health Organization, NICE, ICC, CCC, and the U.S. National Academy of Medicine all recognize it as a neurological illness, not a psychosomatic one.
Until medical systems fully align with that reality, advocacy, accurate coding (ICD-10 G93.3 or ICD-11 8E49), and insistence on biomedical investigation remain essential to protect patients from misclassification and harm.
Protecting Against Misclassification
Because some medical systems are still influenced by outdated psychosomatic frameworks, it’s important for both patients and clinicians to anchor ME in its correct diagnostic and legal classification. This helps prevent it from being replaced with MUS, FND, SSD, or BDS labels.
Use the Correct ICD Code
* ICD-10: G93.3 — Post-viral fatigue syndrome / Myalgic Encephalomyelitis
* ICD-11: 8E49 — Post-viral fatigue syndrome. Always ensure that this neurological code appears on your medical record, referral letters, and disability paperwork. This protects against being misfiled under psychiatric or “functional” categories.
Cite Official Guidelines and Statements
When questioned or challenged, reference authoritative sources such as:
* NICE Guideline NG206 (UK, 2021): recognises ME/CFS as a chronic, multisystem disease and warns against CBT/GET as curative.
* WHO ICD-10/11 classification: confirms ME is a neurological illness.
* International Consensus Criteria (ICC, 2011): defines ME as a neuroimmune disease with measurable biological dysfunction.
“Myalgic Encephalomyelitis is classified by the World Health Organization as a neurological disease (ICD-10 G93.3 / ICD-11 8E49). It should not be reclassified as MUS, FND, or any functional disorder. Management should follow biomedical guidelines such as the 2021 NICE recommendation for pacing and symptom support.”
Ask for Biomedical, Not Behavioural, Care
Request investigations that are relevant to ME’s known pathophysiology — such as autonomic testing, immune markers, or cerebral blood-flow studies — and decline programs based solely on psychological re-training or graded exercise.
Maintain Copies of All Documentation
Keep copies of test results, diagnostic letters, and any written confirmation of the G93.3 or 8E49 code. These records can be critical for appeals, disability reviews, or when transferring care.
In Summary
Protecting the neurological classification of ME safeguards both medical accuracy and patient rights. Using the correct ICD code, citing authoritative guidelines, and keeping records ensures that Myalgic Encephalomyelitis is treated as what it truly is: a serious, complex neuroimmune disease, not a psychosomatic or functional disorder.