This is good advice and good practice for all medical device companies, not just startups. Market segmentation is difficult but, properly done, leads to successful launches.
Here are a few other ways to categorize and target physicians beyond medical specialty:
Career status: Resident, senior resident/fellow, young attending, mid-career attending, late career attending, emeritus.
Decision-maker status: Department head, Chief of practice, second-in-command, member of purchasing committee or similar group, “worker bee.”
Case load: low, medium, high, unbelievable.
Geographic region: There are clear differences around the USA in medical practice as well as from country to country.
Corporate affiliations: You may or may not want to target physicians with strong ties to your competitors. And the ties can be VERY strong!
Primary type of practice: Hospital, research/academic/teaching, private practice, VA/military, standalone surgery centers. There is a lot of overlap in this category with physicians working in multiple settings so it can be a bit fuzzy.
Technology adopter status: Innovator, Early Adopter, Early Majority, Late Majority, Laggard
Influencer/Key Opinion Leader/Notoriety Status: Prolific article author, leads or participates in numerous clinical trials, frequent speaker at medical conferences, frequently interviewed and/or quoted in news and media.
You can purchase lists of physicians with some demographic data relatively inexpensively. You should then create a database and augment that data regularly with information you or your commercial team finds. Before you make final decisions about targeting, be sure to talk with actual prospects and test your model!
As for what happens after a company has decided its target specialties, Kim offers this advice: “If we could do it over again, we would have spent at least six months to one year working on site or near-site with a handful of actual customers.”