An ROI discussion should begin with a financial question the practice can audit: which new patients can reasonably be attributed to organic search, what did the search program cost during the measurement period, and what economic value did those patients actually create or are they reasonably expected to create under the practice's own accounting assumptions?
Consider the source's existing illustration as a calculation example rather than a benchmark. If a practice spends $3,000 during a measurement period and attributes a defined patient cohort to organic search, a resulting figure such as $375 per acquired patient is only useful when the attribution rules, included costs, and patient-value assumptions are documented. The example does not show that another practice will acquire patients at the same cost.
The same discipline applies when comparing SEO with paid search using acquisition cost. A paid-search scenario that uses a $15 click price, a 3% conversion assumption, and an estimated $500 lead cost is a model, not proof of future performance. Compare channels with observed patient outcomes and the same denominator instead of mixing cost per click, cost per lead, and cost per acquired patient.
Build the business case from three evidence groups. First, define patient value from billing and finance data. Second, include the full SEO investment relevant to the period, including internal labor or external fees when leadership wants a total-cost view. Third, document how each patient was attributed to organic search and how uncertain cases are handled.
A useful ROI output therefore includes both a result and a confidence statement. If the attribution is incomplete or patient value is modeled rather than realized, label the result accordingly. Traffic, impressions, and rankings can explain what changed in search, but they do not by themselves establish financial return.