As always, your knowledge of coding far exceeds mine, Suzy, and I actually don't have any arguments against any of the points you've been making. Coding is a reflection of practice though. It does not dictate practice. So while everything you're saying is true, I'm still not clear what conclusion we should draw from it.
These are the conclusions to be drawn from
Post #42 and
#62:
a) that WHO has standardised ways of presenting content within ICD-10 and ICD-11 which also apply to clinical modifications of ICD (also known as "national modifications" or "country modifications"), for example, ICD-10-CM, ICD-10-CA, ICD-10-GM, ICD-10-AM);
b) that WHO has coding conventions which also apply to clinical modifications of ICD;
c) that categories within ICD are mutually exclusive;
d) that the ICD coding convention is that conjoined terms cannot be used;
e) that irrespective of how disease/disorder nomenclature may be being used in practice, in order to maintain standardisation across the various versions of ICD, conform to ICD coding conventions and to the WHO's requirements for data analysis and backward compatibility and comparability, ICD cannot accommodate the addition of historically discretely listed terms joined together to form a new composite term.
After January 01, 2020, member states will be reporting morbidity data using ICD-9 (in a small number of countries); using the International edition of ICD-10 (which may be Version: 2015, 2016 or 2019); using a country specific clinical modification; or will be early implementers of the new ICD-11 code sets, where a country's health system is ready to migrate to the new edition.
ICD-10 and ICD-11 are designed to be integrable with other classification and terminology systems and forward and backward mapping tables are provided for ICD-10 to ICD-11; SNOMED CT to ICD-10; SNOMED CT to ICD-11; ICD-10 to ICPC-2 (and are in development for ICD-11 to ICPC-3).
Having the term "Chronic fatigue syndrome" used in practice for a different diagnostic construct alongside the term "Myalgic encephalomyelitis/Chronic fatigue syndrome" would create code mapping difficulties, too, for those countries whose health systems use ICD-10 alongside ICPC-2, or use ICD-10 in conjunction with the SNOMED CT terminology system.
The conjoined terms, "CFS/ME" and "Chronic fatigue syndrome/myalgic encephalomyelitis" have been in use, clinically, within NHS England since the pilot "CFS/ME" clinics were rolled out in 2006 and the NICE CG53 guideline published in 2007. The 2002
Report of the CFS/ME Working Group also used the composite term "CFS/ME" throughout its Report.
But for NHS England Data Sets and for statistical reporting to the WHO, the "target code" remains G93.3 Postviral fatigue syndrome, irrespective of which term a clinician or a coder enters into the electronic patient record, because all three terms are discretely classified in ICD-10 and direct the coder to G93.3, which is known as the "target code".
Dr O'Leary has said
"Coding is a reflection of practice though. It does not dictate practice."
Not necessarily.
In October, the new
IAPT Data Set Version 2.0 is being rolled out. (Data Set v2.0 had been intended to implement in April but has been postponed to October 01, due to Covid-19.)
For Data Set v2.0, the term being used for CFS, ME, CFS/ME, ME/CFS is "Chronic Fatigue Syndromes/ Myalgic Encephalopathy (ME)"* and the "target code" for IAPT data reporting is G93.3 Postviral fatigue syndrome.
See screenshot:
https://dxrevisionwatch.files.wordpress.com/2020/07/revised-iapt-3.3-mapping-ssd-for-october.png
Source: IAPT Spreadsheet file:
https://digital.nhs.uk/binaries/con...apt_v2_terminology_mapping_guidance_v3.3.xlsx
*Note that "Myalgic encephalopathy" (the ME Association's preferred term) is designated as an "Acceptable" term in the SNOMED CT UK Edition and is cross mapped to ICD-10's G93.3.
As readers of my reports will be aware, back in November, IAPT leads submitted a
request to NHS Digital for a new Concept code for "Somatic symptom disorder" to be added to the SNOMED CT UK Edition in order that IAPT could use the term "SSD" in its new Data Set v2.0.
This request was forwarded on by NHS Digital to SNOMED International for discussion by their senior terminology leads. IAPT leads have requested the addition of "Somatic symptom disorder" for addition to SNOMED CT because NHS services can use both ICD-10 codes and SNOMED CT terminology codes, where a code is absent in ICD-10 - and there is no code for SSD in ICD-10. A large number of new codes associated with IAPT service provision have already been added to SNOMED CT UK Edition.
IAPT leads want to replace the current Data Set v1.5 terminology,
"MUS - not otherwise specified" (mapped to ICD-10 F45.9 Somatoform disorder, unspecified) for its new Data Set v2.0 and associated literature with a new SNOMED CT Concept code for "Somatic symptom disorder" because it considers the term
"MUS - not otherwise specified" is no longer appropriate for the IAPT cohort to which the term was previously assigned in Data Set v1.5.
If SNOMED International
does approve this request, the SSD term will be added to the SNOMED CT International Edition and then incorporated into all the various country editions, including the US edition. (SNOMED International has the option of approving this request solely for addition to the UK Edition but that would be an anomalous, given that the DSM-5 SSD term has yet to be added to the US edition.)
If approved, this might be viewed as an example of a coding change reflecting [IAPT] practice.
Approval of addition of the SSD term to SNOMED CT and the IAPT Data Set v2.0 might potentially result in embedding of the SSD term into other NHS clinical settings beyond the realm of IAPT, which would also be detrimental to diverse patient populations - so I have robustly opposed this request.
With regard to
"[Coding] does not dictate practice", it has been the WHO's decision to replace most of the ICD-10 F45.x Somatoform disorders and F48.0 Neurasthenia with the far more loosely defined, 6C20 Bodily distress disorder for ICD-11. Which might be viewed as the WHO dictating practice despite robust opposition to the BDD diagnostic construct.
Dr O'Leary has said:
My BMJ letter basically says clinicians should use these terms in the way that's recently become standard in health policy and research - where CFS is the Sharpe/Wessely psych construct that's been rejected by the US, and ME/CFS is the biomedical disease that's now getting so much attention in research.
I think you don't actually disagree with that.
Given that this use of terms has been a good thing for ME patients, seems like it might be good for the ME community to support it.
If I have understood Dr O'Leary correctly, what she is proposing is this:
that the conjoined terms "ME/CFS" and "Myalgic encephalomyelitis/Chronic fatigue syndrome" should be used in practice for "the biomedical disease";
that the term "CFS" and "Chronic fatigue syndrome" should be used solely to describe "a psychiatric condition that sometimes develops in reaction to acute viral infection. It is essentially deconditioning that arises from inactivity when patients embrace faulty illness beliefs."
Under this proposed framework, it is currently unclear to me what code Dr O'Leary envisages should be used in NHS England data sets to record and collect data for the "Chronic fatigue syndrome" that is not "Myalgic encephalomyelitis/Chronic fatigue syndrome" - both at the point of care, and for recording the episode of patient contact, after the event, for reporting data for statistical and epidemiological analysis.
The "Chronic fatigue syndrome that is not Myalgic encephalomyelitis/Chronic fatigue syndrome" would need a target code to differentiate it from ICD-10 G93.3 and it would need to be clearly defined, if it is to have clinical utility.
So I would be interested to know how Dr O'Leary proposes "Chronic fatigue syndrome" would be coded for in NHS Data Sets?
I assume that Dr O'Leary proposes this distinction for use in NHS England but also for all member states, including those member states that are licensed by the WHO to develop and maintain their own modifications of ICD, for example, the US.
Before I am able to form
any position on Dr O'Leary's proposal, I consider that wide discussion and consultation amongst UK and international patient organisations, advocates, patients, caregivers, clinical and research allies would need to take place
to determine the impact on patients and to evaluate the potential for unintended consequences:
given the historical and current usage of all three terms in the UK and globally;
given that some countries are responsible for their own versions of ICD;
given that some member states have adopted the clinical modifications of other countries;
given that ICD-10 cannot be updated;
given that ICD cannot, in any case, classify a conjoined term like "Myalgic encephalomyelitis/Chronic fatigue syndrome";
given that the ICD-10 "target code" for all three terms will remain G93.3 Postviral fatigue syndrome for the remaining life of the ICD-10 International edition;
given there are exclusions under ICD-10's F48.0 Fatigue syndrome for the G93.3 code;
given that the WHO's decision to retain all three terms under the Diseases of the nervous system chapter was supported by the ICD-11 MSAC and CSAC committees;
given that the ICD-11 code sets are now frozen and the entity "Chronic fatigue syndrome" cannot be relocated to another ICD-11 chapter or under a different Parent class, since this would entail a change of code;
given that all three terms and their associated index terms all direct coders to the 8E49 target code in the ICD-11 electronic search engine (the ICD-11 Index);
given that for ICD-11, there are exclusions specified for all three 8E49 terms under the
Mental, behavioural and neurodevelopmental chapter's BDD and under the
Symptoms, signs chapter's MG22 Fatigue;
given that many patients in the UK, the US and beyond have "Chronic fatigue syndrome" recorded as their diagnosis in their medical records;
given that in the US, an ICD-10 code is essential for reimbursement purposes, patient records and data reporting (and in the US there is a choice of assigning one of two codes, either G93.3 or
R53.82 Chronic fatigue syndrome NOS and many US patients will have been assigned the
R53.82 Chronic fatigue syndrome NOS code in their medical records);
given that the US's NCHS/CDC has discussed proposals for the potential relocation of Chronic fatigue syndrome back under G93.3 for ICD-10-CM, and for the addition of the SEID term;
given that in some countries, application of a psychiatric disorder code will have implications for "care pathways" and will determine what tests, investigations and treatments a clinician can order and what insurers will be prepared to reimburse;
given that application of a psychiatric disorder has implications for employees' medical insurance and may determine the duration of medical insurance cover and the types of treatments employees might be expected to undertake, for example CBT/GET or similar therapies - it should not be underestimated what a complex and nuanced conversation this is.
I am not persuaded that Dr O'Leary has given due consideration to all these issues.
So no - I cannot say that I don't actually disagree with this proposal.
Nor can I agree that
"it might be good for the ME community to support it" because I can envisage significant implications for patients, the potential for unintended consequences and considerable scope for diagnostic and nomenclature confusion amongst patients, health care providers, payers, researchers, coders, social services, education and workplace accommodations, medical insurers, welfare benefits agencies, tribunals and legal cases, in addition to the issue of not being able to code for conjoined terms (both in ICD and SNOMED CT) and
because a suggestion like this needs substantive discussion, consultation and analysis amongst UK and international stakeholders to determine the implications for patients and evaluate potential unintended consequences - and this is a dialogue that hasn't taken place.