It is well known that premodern Western medicine, Islamic, Jewish and Christian, was primarily Galenic and Avicennan. Less well known is the fact that it was also often occult. As a rule, physicians and pharmacologists sought to extrapolate from visible to nonvisible data, harness mind-matter and mind-mind interactions and activate cosmic correspondences in diagnosing and treating disease. Other occult sciences like alchemy, astrology and geomancy were routinely utilized as well. Of course, most Western and Westernized physicians today scorn the occult as religious superstition, hence fundamentally opposed to science. Yet they still acknowledge the placebo effect—a form of magic by any premodern definition—as one of the most powerful in modern medicine, and certain forms of “alternative medicine” such as acupuncture and homeopathy are now insurable. To help decolonize the historiography of premodern medical traditions, Western or otherwise, I propose that we dispense with outmoded nineteenth-century materialist cosmology to reconceive of modern medical practice as sometimes technically occult too.