Planned Marginalization of CFS in the 'American' ICD
First, for some clarification - it isn't really that the WHO thinks ME and CFS are different diseases; they just don't think CFS is a sufficiently well-described term, and consider ME (which they already had on the books) and even post-viral fatigue syndrome (I don't think anyone knows what exactly they mean by that, but at least the name is clear) to be more valid... I suspect if someone came up with a better disease definition, with more scientific validity, they would adopt it.
The WHO has been the one relatively consistent voice of relative sanity on the issue of definitions in this matter. They had classified a disease known as myalgic encephalomyelitis as a neurological disease. They have a strict rule that no disease can be classified in more than one section, i.e. ME, a neurological disease, cannot also be classified as a psychiatric disease (they made a point of this when Wessely and friends tried to get it re-classified - and claimed that it could be, and basically lied that it had been).
I don't think the WHO liked it when the CDC decided to create their own illness after the Tahoe epidemic, and subsequently watered down the definition of "CFS" further and further (I'm sure they didn't appreciate the creation of the "Oxford Criteria" either). Seeing how unscientific, vague, and confusing this new disease category was, they never accepted "chronic fatigue syndrome" as a legitimate term; essentially they either put it in the index of 'inappropriate names' and said "see ME", or listed it separately in a section for conditions consisting of particular clusters of symptoms (not validly defined 'diseases').
Some countries have been allowed by the WHO to make their own 'clinical modifications' of the WHO classifications for their own purposes. The US has been doing this for a while... Instead of adopting the upcoming ICD-11, we Americans will get the ICD-10CM, which will potentially pose many problems for us; although it will for the first time include "benign myalgic encephalomyelitis" under G93.3 (finally getting in step with the rest of the world),
it will specifically EXCLUDE CFS from the neurological disease section (that was the ICD-10CM status as of late last year, anyway):
G93.3 Postviral fatigue syndrome [note: same as ICD-10]
Benign myalgic encephalomyelitis
Excludes1: chronic fatigue syndrome NOS (R53.82) [note: not in ICD-10]
(By the way - the ICD-10 is what most of the world is currently using, but not us Yanks..)
Here is where the next US version (ICD-10CM) will put CFS:
R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (Chapter 18)
R50-R69 General symptoms and signs
R53 Malaise and fatigue
R53.8 Other malaise and fatigue
R53.82 Chronic fatigue, unspecified [note: not in ICD-10]
Chronic fatigue syndrome NOS [note: NOS is new; the listing for CFS in ICD-9 does not say NOS ]
Excludes: postviral fatigue syndrome (G93.3)
There used to be a listing for Chronic fatigue syndrome, post-viral under G93.3 along with PVFS and Benign ME in a previous version of ICD-10 CM (USA). It was removed in 2007, when the new code R53.82 was created for CFS."
(The above is from a document by Ben, which reflects the ICD-10CM proposal through late last year.)
"NOS" means "not otherwise specified"... meaning it isn't entirely clear what it is, but it isn't anything else in the book... in other words we're back to the old CDC business of a 'diagnosis of exclusion', or a negative definition with only one clear characteristic - the "F" word. Will it be more difficult to get your diagnosis of CFS taken seriously by insurance companies and government disability agencies once it has the "NOS" tag? I don't know, but it can't help.
So, basically, CFS is being further and further marginalized in the US versions, while ME as defined in the usual WHO sense is appearing for the first time since the CDC starting rewriting medical history (the current US version doesn't have ME in it at all). However, how many US doctors know what ME is (or "benign ME") such that they could actually apply the new diagnostic label (instead of CFS)? A neurologist I saw recently just looked at me and smiled like I had just made a joke when I tried the term on him; he said "What's that?...Never heard of it." I'm sure he thought I made it up. It also doesn't help that, at least as to my understandng, there are no widely accepted criteria for ME in the biomedical community; definitions exist (Ramsay, Ramsay-Dowsett, etc), but are rarely if ever referred to.
The upcoming Canadian modification of the ICD is quite the opposite; it will include CFS in the neurological disease section under G93.3, along with "benign" ME and PVFS. That's giving CFS more recognition than - as far as I know - any ICD version yet.
As far as the Name Change panel business goes... My understanding is that they wanted to use the term ME but agreed to add the "/CFS" over concerns about creating confusion in research fields (where the term CFS was most often used); the real problem has always been, and remains, the CDC (or whoever they are speaking for)... if they decided to change the terminology and adopted the Canadian criteria of something similar, the research community (not to mention the US government and private insurance companies) would adapt quickly. In biological research these kinds of nomenclature and classification changes happen all the time within a given specialized field, and other fields catch on as necessary.