The DSM is an ever evolving book and likely always will be. Mental illness follows some loose guidelines but every edition is changed here and there because providers report problems or difficulty with what fits under each code.

Racing mind ? That can de described in so many ways there is always going to be a code for “ that feeling”

Insurance companies like to find ways to justify denial of a claim so Medical providers of all kinds have to keep sending formal complaints.

ICD9 code .... V97.33XD will always mean stuck in a jet engine. So just one example that ICD9 will make new codes when need be.

So although mental health diagnosis might shift or a bit fluid but your medical provider is going to match your symptoms to a code so your insurance will cover and your medication coverage will cover medications. Sometimes theres a bit of struggle for medications but a good providers staff will file the needed forms to get that medication approved.

Could the system be easier ? Sure but I think it’s working pretty well all things considered.