For example, if a provider is cash-only, they are not bound by HIPAA.
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It's really important to see the nuance in the definition of a covered entity: https://www.hhs.gov/hipaa/for-professionals/covered-entities...
> This includes providers such as:
> Doctors
> Clinics
> Psychologists
> Dentists
> Chiropractors
> Nursing Homes
> Pharmacies
> *...but only if they transmit any information in an electronic form in connection with a transaction for which HHS has adopted a standard.*
Emphasis mine. That last sentence is the big "gotcha" on who HIPAA applies to.