What companies actually pay physicians for
The difference between being asked for a favour and being retained as an advisor is rarely clinical ability. It is legibility.
Most physicians have given free advice to a founder, an investor or a former colleague building something. Very few have turned that same conversation into a retainer.
The gap is not credibility. It is that the company could not see, before the call, exactly which decision you were qualified to de-risk.
Companies buy reduced risk, not seniority
A health technology company hiring a clinical advisor is buying protection against expensive mistakes: a workflow no nurse will adopt, a claim the regulator will reject, a trial design that produces unusable evidence.
Titles do not price that. Specific, demonstrated judgement about a named problem does. The advisor who has publicly written about discharge workflows is easier to justify to a board than the more senior physician whose public record says only where they trained.
Four things that make a physician retainable
First, a stated category. You are not a generalist with opinions, you are the person who understands X in context Y.
Second, evidence in public. A handful of substantive posts, a talk, a paper written for a commercial audience rather than a clinical one.
Third, a clear commercial shape. Hours, scope and rate defined before you are asked, so the conversation moves to signature rather than to negotiation.
Fourth, reachability. The company must be able to find you within one search of the problem they are trying to solve.
What the money looks like
Advisory retainers for experienced clinicians typically sit between two and six thousand dollars a month for a defined number of hours. Project consulting runs on day rates. Board work is usually annual and often equity-linked in earlier-stage companies.
None of this replaces clinical income for most doctors, and it is not supposed to. It changes the ratio between hours worked and value captured.