Start with high-confidence medical thrillers books, then narrow by subgenre or adjacent topics.
Chaos
Patricia Cornwell
Cold Storage
David Koepp
Blindness
José Saramago, Giovanni Pontiero
Coma
Robin Cook
Vital Signs
Acceptable Risk
Fever
Shock
Invasion
Critical
Death Benefit
George Guidall, Robin Cook
Cell
Host
Mindbend
Pandemic
Genesis
The Society
Michael Palmer
Viral
Night Shift
Charlatans
Cook County ICU
Cory Franklin MD, John Pruden
Every Fifteen Minutes
Lisa Scottoline
Resistant
Robert Petkoff, Michael Palmer
Under the Knife
Kelly Parsons
Saving Meghan
D.J. Palmer
Extremity
Nicholas Binge
Observer
Robert Lanza, Nancy Kress
Gravity
Tess Gerritsen
Ward D
Freida McFadden
The Good Nurse
Charles Graeber
Lost Immunity
Daniel Kalla