Definition
Cost per patient is the amount spent on advertising in a period divided by the number of patients from those ads who actually had treatment or paid a deposit. Unlike CPL, it measures the bottom of the funnel: money went out, how many patients came in?
Calculating it requires connecting two pieces of data: which ad the lead came from (attribution) and how far that lead got in your pipeline. Without that link, the number is a guess.
Why it matters for clinics
For a clinic owner, the real question isn't how many forms came in but how many patients and how much revenue the spend produced. Cost per patient is the most reliable basis for splitting budget between campaigns and channels. It also reflects sales performance: a team that turns the same leads into more patients lowers the cost.
Example
A hair transplant clinic spends $6,000 a month on ads, and 24 patients from those ads pay a deposit for surgery. Cost per patient is $250. Broken down by channel, Google Search patients cost $180 each and Instagram patients $310.