Two million subscribers — and counting.
Physicians are leaving the hospital newsletter and the op-ed page behind, and building direct relationships with readers. This is the story of how big that movement has become — told in the numbers.
Techy Surgeon · your guide I read, verify, and chart these writers every month. Scroll with me — the scale of this surprised even me.
Active subscriptions on Substack. The paid tier alone crossed five million in 2025 — a fifty-fold rise in five years. Long-form, reader-funded writing isn't a niche anymore. It's a publishing economy.
Physicians built large followings on short-video and social platforms — many of the writers in this directory still carry six-figure audiences there. But a feed rents you its attention. An algorithm decides who sees the work, and the format caps how deep it can go. The audience, in the end, belongs to the platform. A newsletter inverts that.
The email list is a durable asset, and the long form has room for evidence. The other platforms are where doctors are found. This is where they are read.
White Coat Dispatch tracks the physicians writing seriously on Substack — and verifies them against the national provider registry, so readers know the byline holds a real license.
Techy Surgeon Verification is the whole point. Anyone can write "Dr." in a byline — 92 of these writers check out against the federal registry, name, specialty, and all.
Primary care leads, but the range is the story — women's health, emergency medicine, cardiology, psychiatry, the operating room, the policy desk.
Known subscriptions across the directory. Every light in this water is one physician's readership — Eric Topol's 214,000 down to the newest voice finding its first hundred readers.
The ten largest publications hold 58% of the total readership — but the median physician writer here reaches about 5,100 readers, and nearly a quarter are still under a thousand. The movement is top-heavy and young at the same time: the giants prove the ceiling, the tail is where it grows.
Cardiologist and Scripps Research founder; the field's most-read chronicler of medical evidence and AI in medicine.
Hematologist-oncologist writing sharply on evidence standards, trial design, and health policy.
OB/GYN and bestselling author; the internet's fiercest debunker of women's-health misinformation.
Cardiac electrophysiologist making the conservative, evidence-first case in cardiology every week.
And a hundred more — surgeons, obstetricians, emergency physicians, psychiatrists — publishing directly to the people they serve.
Substack's influence keeps compounding, and capturing the physician voice — credentialed, direct, unfiltered — matters more every year. White Coat Dispatch will keep verifying the writers and counting the readers they reach.
Techy Surgeon New physician voices surface every month. If one deserves a spot on this map — including yours — send them my way.