156 companies are approved to sponsor Renal Medicine Specialist on a 482 or 186 visa (Department of Home Affairs data, FOI FA 25/01/01229).
Most occupations need a positive skills assessment from this authority; where several apply, you generally choose one.
Being on the list is just the first step — you still need a sponsoring employer, salary above the threshold, a skills assessment, and English proficiency.
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This is general information only, not migration or legal advice. The occupation list is demand-led and can change. Always verify with the Department of Home Affairs or a registered migration agent (MARA).