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"Telemedicine" is one word covering very different kinds of medicine. A dermatologist reading photos of a rash, a radiologist reading a CT from three time zones away, a psychiatrist running a full session over video, and a nurse watching a heart-failure patient's daily weights all count. They share a network connection and almost nothing else.

That is the first thing to understand, and the reason this section is organized by specialty rather than by technology. The clinical question decides the tool. Whether a condition can be handled remotely depends on what the clinician needs to see, touch, or measure, and how fast a decision has to be made.

Start with the question you are actually asking

If you want to know whether your own care can move online, start with telepsychiatry and teledermatology. They are the two specialties where virtual care is most mature, and they show the two patterns most others follow: live video for conversation-driven medicine, and store-and-forward for image-driven medicine.

If you are a clinician or administrator deciding what to build, start with telehealth technology and remote patient monitoring. Those two guides cover the platform decisions, the device economics, and the integration work that decides whether a program survives its second year.

If you are here because of a hospital or emergency use case, emergency telemedicine covers telestroke and tele-ICU, which are the highest-stakes and best-evidenced applications in the field.

What the specialty guides have in common

Every guide answers the same five questions: what the specialty actually does remotely, what it cannot do, what the evidence says about quality, how it gets paid, and what a patient should expect from a visit. Where a specialty has rules of its own, such as the exam requirements that shape teledentistry in some states, or the multi-state credentialing that teleradiology groups live with, the guide says so.

The guides do not claim more than the evidence supports. Telesurgery is real and remarkable and also rare, and the guide treats it that way. Telepathology and telecardiology are further along than most people assume, and the guides explain why.

Two guides that cut across every specialty

Telehospice and telemedicine for people with disabilities and complex care are about populations, not specialties. They matter because these are the patients for whom a video visit is not a convenience but the difference between getting care and going without. If you design programs, read them before you design intake.

How to read this section

The guides are written for two readers at once: an informed patient trying to make a decision, and a professional who needs the operational details. Both get the plain-English version first. Terms are defined the first time they appear, and the telehealth glossary covers the rest.

Rules that vary by state, such as licensure, prescribing, and consent, live in the state law guides rather than being repeated in every specialty article. Payment lives in the reimbursement guide. When a specialty guide touches either topic, it links out rather than paraphrasing.