David Felsenthal, a healthcare valuation pioneer who consulted for Medicare’s architects, died Nov. 7. He was 86. Felsenthal, a World War II veteran who began as an insurance appraiser in 1948, co-founded the companies where he spent more than half his career, most recently Principle Valuation in 2007. Timothy Baker, president of Chicago-based Principle Valuation, said Felsenthal, who was being treated for bone cancer at the time of his death, loved his work and talking with people. Baker and Felsenthal formed Principle Valuation after Huron Consulting Group acquired Wellspring Partners, where Felsenthal co-founded a valuation practice in 2001. Felsenthal joined Wellspring after leaving the company he founded in 1970, Valuation Counselors; he retired from that company in 1989 at age 65 but had remained as a consultant.