Little is known about the characteristics of the workforce providing home-based medical care for traditional (fee-for-service) Medicare beneficiaries. We found that the number of participating home care providers in traditional Medicare increased from about 14,100 in 2012 to around 16,600 in 2016. Approximately 4,000 providers joined or reentered that workforce annually, and 3,000 stopped or paused participation. The number of home visits that most participants provided each year remained below 200. Only 0.7 percent of physicians in Medicare provided fifty or more home visits annually, with little change over the course of five years. In contrast, the number of home-visiting nurse practitioners almost doubled, and the average number of home visits they made increased each year. Despite generally low overall participation of traditional Medicare providers in home-based care, the workforce has seen modest but steady growth, driven primarily by increasing nurse practitioner participation. Additional stimuli may be necessary to ensure workforce adequacy and stability.