It really is. Psychiatry is a medical practice (one of the neurosciences) which relies heavily on chemical analysis, structural analysis, and comparison to global and individual baseline using tests such as MRI, fMRI, CT, PET, and other scans. Additionally, Psychiatry has an holistic component (hence why practitioners of Psychiatry have medical degrees and licensure, unlike psychological counselors), whereby the rest of the body and the impact that can have on medication, testing, resolution, and practical management of disorders and illnesses.

You’re objectively, and likely willfully, confusing the fields of clinical psychology and Psychiatry. You’re resting all of this on some version of the DSM, which is only used where necessary because even many practitioners take umbrage with much of the DSM (another reason why Psychiatry is not only a better science, but a better practice, is that it doesn’t require reliance on the DSM like much of clinical psychology does).

Note this is different from Neuropsychology and CBT practitioners, although there is some overlap and confusion for laypeople in the differences between the psychological practices from some of the neurosciences.

Edit because I forgot to include this: What is your opinion and experience of the ICD codes for diagnostics? Additionally, what is your experience utilizing and experience with the DSM in practice?