USA - Social Security Administration: Providing Medical Evidence for Individuals with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) 2018

Social Security Administration: Providing Medical Evidence for Individuals with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS)

This 3-page official document is from the US but could be useful for people applying for disability payments in other countries also.
https://www.ssa.gov/disability/professionals/documents/64-063.pdf

 

Also
"This Social Security Ruling clarifies our policy on how we develop evidence to establish that a person has a medically determinable impairment (MDI) of #CFS and how we evaluate this impairment in disability claims and continuing disability reviews under titles II and XVI the Social Security Act (Act).[1]"

https://www.ssa.gov/OP_Home/rulings/di/01/SSR2014-01-di-01.html