At eighteen months old, Alex Rivera underwent surgery. No one asked for consent. No one ever explained why. Thirty-five years later, Alex sits in a hospital archive, reading the truth for the first time — and discovering they were not alone. Born Unclassified is the first comprehensive narrative history of how American medicine spent seventy years surgically "normalizing" children whose bodies defied binary classification. Drawing on institutional archives, court records, and over one hundred firsthand accounts, Francis M. Rhoades traces the full arc of a hidden crisis — from Johns Hopkins' controversial 1950s gender protocols to today's uneven legal reforms. This is the story of medical authority unchecked: of parents counseled into silence, of children who grew into adults carrying scars they were never meant to question, and of the courageous community that eventually fought back. It is also the story of what happens when patients reclaim the right to define their own bodies. Rigorous yet deeply human, Born Unclassified takes a look at how we understand medicine, ethics, and who gets to decide what a body should be. For readers of narrative nonfiction, gender studies, and medical ethics — this is the history that was always owed.