Depending on your location Robert Half Healthcare would probably be a good option for you. If not then try Officeteam. There are temporary lines of business for accounting, finance, technology (development and support), legal, and creative industries alongside Officeteam (administrative) and Robert Half Healthcare.
I worked for the Healthcare team at Robert Half recently. They only staff for Administrative and Revenue cycle professionals in the medical field. So if you are ok not utilizing you clinical experience they would be a great option for you.
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