Don't ever stop being that person.
Well that's very tolerant of you, Sean.
I'd like to add the following observation and then I'll shut up about ICD and coding: amongst some patients and some advocates a reverence towards the WHO and their classification experts has developed over the years which, in my experience, might be somewhat misplaced.
Two official statements of clarification issued by the WHO's Dr B Saraceno (2001) and Andre l’Hours (2004) have served us well down the years. But these WHO statements skirt delicately around the issue of
Chronic fatigue syndrome in the ICD-10 Index.
According to a February 2009 response from Dr Robert Jakob, WHO Classifications, Terminology and Standards Team, terms that are listed in the Index may be:
a synonym to the label (title) of a category of ICD;
a sub-entity to the disease in the title of a category;
or a "best coding guess".
In indexing
Chronic fatigue syndrome to G93.3, ICD-10 does not specify whether it views the term as a synonym, a sub-entity or a "best coding guess" to
Postviral fatigue syndrome or to
Benign myalgic encephalomyelitis.
Nor does ICD-10 specify how it views the relationship between
Postviral fatigue syndrome and
Benign myalgic encephalomyelitis and includes no guidance within ICD-10's Tabular List or in the Instruction Manual on how coders and clinicians on might differentiate between the two when assigning a code.
(Note in the U.S., Donna Pickett and her colleagues at CDC have issued statements of guidance for coders/clinicians on when PVFS might be applicable and when the U.S. specific entity,
R53.82 Chronic fatigue syndrome NOS, should be considered instead.
In the absence of specification within ICD-10 and in the absence of clarification by WHO HQ, Geneva, I make no assumptions about how ICD-10 views the relationship between any of the three terms coded to G93.3 (now 8E49 for ICD-11).
Latterly, WHO classification experts have become disturbingly sloppy in their use of terminology.
I have been in direct communication with various WHO and ICD-11 classification leads since 2012. In my communications, I have always referred to the three ICD-10 and ICD-11 entities as they appear within the classification, namely:
Postviral fatigue syndrome;
Benign myalgic encephalomyelitis; and
Chronic fatigue syndrome.
But in email responses from Dr Robert Jakob and others, I have noted
"Chronic fatigue syndrome" being used generically for all three terms, despite the fact that the title term in ICD-10 is
Postviral fatigue syndrome, and remains so for ICD-11
.
I have been horrified to see
"chronic fatigue" used by WHO staff, when all three terms are being referred to.
As you can imagine, it makes my trunk curl to see such casual use of terminology from terminology experts.
In the November 2017 proposal from WHO staffer, Dr Tarun Dua, she had used the following terms in her proposal rationale for dumping "ME/CFS" [sic] in the
Symptoms, signs chapter, as a child category under:
Symptoms, signs or clinical findings of the musculoskeletal system.
"Chronic Fatigue Syndrome Proposal"
[But the legacy concept title term is Postviral fatigue syndrome and the proposal should have been presented in the context of that term.]
and
"Myalgic encephalitis/Chronic Fatigue Syndrome (ME/CFS)"
["Myalgic encephalitis" does not exist in ICD-10 or ICD-11, though it is included in SNOMED CT.]
["ME/CFS" does not exist in ICD-10 or in ICD-11. The abbreviations: "PVFS"; "ME"; and "CFS" are included in ICD-11 but all three are listed separately and as Index Terms.]
Dr Dua went on to use "ME/CFS" throughout the rest of her supporting rationale. At no point did she set out what she proposed for the hierarchy between the two ICD entities:
Benign myalgic encephalomyelitis; and
Chronic fatigue syndrome; nor did she state where she proposed to stick the ICD-10 legacy concept title,
Postviral fatigue syndrome - the existence of which she appeared to have conveniently ignored.
Dr Tarun Dua is a medical officer working on the
Program for Neurological Diseases and Neuroscience, Management of Mental and Brain Disorders, Department of Mental Health and Substance Abuse, WHO. She specialises in epilepsy and dementia.
She had served as WHO secretariat to the Topic Advisory Group for Neurology and had been the advisory group's Managing Editor. She told me her proposal had been submitted on behalf of the TAG Neurology advisory group (though that group had been sunsetted in October 2016).
Her lack of accuracy and specificity around the WHO's own terminology was curious and unacceptable. She was asked to correct the terminology and provide her proposals for a revised hierarchy between the three terms - but she never did and neither did her line manager, Dr Saxena, despite receiving formal letters from Forward-ME (which I had drafted).
This proposal should have been rejected outright by the Proposal Mechanism admin teams and returned to Dr Dua for redrafting and re-submission, since it failed to follow the ICD-11 conventions for setting out proposed changes and had used terms which don't exist in ICD.
So I don't have too much confidence left in the WHO.