Three weeks after bypass surgery, a 68-year-old finds a referral slip for cardiac rehabilitation in his discharge folder. He feels fine. He never calls.
He has a lot of company. A 2024 study in the Journal of Thoracic and Cardiovascular Surgery followed 166,809 Medicare patients who had cardiac surgery between July 2016 and December 2018. Only 54.1% went to even one rehab session in the following year. Stranger still, the share who went ranged from 0% at some hospitals to 96.8% at others.
Rehabilitation has some of the strongest evidence in medicine behind it. It is also one of the most skipped services in American health care. Part of the reason is that most people hear the word and picture exactly one thing: a physical therapist counting leg lifts after a knee replacement.
That is one slice. Here is the rest.
Rehab is scored on function, not on cure
MedlinePlus, the consumer health service of the National Library of Medicine, defines rehabilitation as care that helps you get back, keep or improve abilities you need for daily life. Those abilities can be physical, mental or cognitive. They can be lost to injury, disease, a condition you were born with, or the side effects of treatment.
Notice what that definition leaves out. It says nothing about curing anything.
That is the point. Rehabilitation is measured in what you can do. Can you climb your porch steps? Can you swallow a cracker without coughing? Can you get your own shirt on in the morning? Someone whose cancer is in remission may still need months of work before she can lift a grandchild. Someone with COPD will still have COPD at the end of a rehab program, and will still, on average, walk farther and breathe easier.
MedlinePlus lists the situations that commonly call for it: stroke, major surgery, burns, fractures, traumatic brain and spinal cord injuries, severe infections, cancer treatment, developmental disabilities, genetic conditions, and chronic pain including back and neck pain.
The disciplines, and what each one is for
People get sent to the wrong one all the time.
Physical therapy: movement
Strength, balance, walking, range of motion, getting in and out of a car without help. The entry credential is a Doctor of Physical Therapy degree, which the Bureau of Labor Statistics says typically takes three years after a bachelor’s. Every state licenses physical therapists and requires a qualifying exam. BLS counted about 283,700 physical therapist jobs in 2025, with a median wage of $102,760.
Occupational therapy: the task
The OT-versus-PT confusion is nearly universal, so here is the shortcut. Physical therapy works on the movement. Occupational therapy works on the task the movement is for.
The American Occupational Therapy Association describes occupational therapy as helping people take part in daily living, beginning with an evaluation of a person’s history, routines, interests and values. In practice that means bathing, dressing, cooking, handwriting, driving, home safety and fall prevention, adaptive equipment, memory and planning strategies, and getting back to a job or a classroom. BLS puts the typical entry degree at a master’s, licensure in all states, and about 169,600 occupational therapist jobs in 2025.
Speech-language pathology: talking and swallowing
The swallowing part surprises almost everyone. BLS describes speech-language pathologists as treating speech, language, voice and fluency disorders including stuttering, along with swallowing problems and the thinking and social communication problems that often travel with them. If a stroke left someone coughing on thin liquids, an SLP is the clinician who evaluates it. Entry is a master’s degree, usually about two years of graduate study, and every state licenses. About 193,400 jobs in 2025.
Physiatry: the physician who owns the plan
A physiatrist is a medical doctor, an MD or DO, who finished four years of residency in physical medicine and rehabilitation. The American Academy of Physical Medicine and Rehabilitation describes that as one year of fundamental clinical skills followed by three years in the specialty, with board certification through written and oral exams from the American Board of Physical Medicine and Rehabilitation. Subspecialty certifications include brain injury medicine, spinal cord injury medicine, pediatric rehabilitation medicine, neuromuscular medicine, sports medicine and pain medicine.
If three therapists are working on you and nobody seems to own the overall plan, a physiatrist is the specialist whose entire job is owning it. Most patients have never heard the word.
Cardiac and pulmonary rehab: programs, not professions
Each is a supervised course of exercise plus education and counseling, delivered by a team and aimed at one organ system and the whole person around it. Both get their own sections below.
Everything else under the same roof
Vestibular rehab for dizziness and balance disorders. Neurological rehab after stroke or brain injury. Cognitive rehabilitation therapy for attention, memory and planning. Vocational rehabilitation for returning to work or school. MedlinePlus also counts recreational therapy, music and art therapy, nutritional counseling, assistive devices, pain treatment and mental health counseling as part of the rehabilitation package. Mental health care has its own article in this library.
Where rehab happens, and why the setting decides the bill
Four settings, four very different rule sets. Medicare’s rules are the clearest published example, and private plans often track them.
Inpatient rehabilitation facility. The most intensive option, with therapy several hours a day and physicians and nurses on site. Medicare Part A covers it when your clinician certifies that you need intensive rehabilitation, continued medical supervision and coordinated care from your providers. For 2026, Medicare.gov lists a $1,736 deductible covering days 1 through 60 of a benefit period, then $434 a day for days 61 through 90, then $868 a day for days 91 through 150 drawn from a lifetime bank of 60 reserve days.
Skilled nursing facility. Less intensive, longer runway. This is where the single most expensive misunderstanding in rehabilitation lives. Medicare covers skilled nursing facility care only after a medically necessary inpatient hospital stay of at least three days in a row. Emergency room time does not count toward it. Neither does time spent under “observation status,” even if you slept in a hospital bed for two nights with a wristband on.
Observation is an outpatient billing category. The bed looks the same. The coverage is not. Ask the hospital, in those exact words, whether you are admitted as an inpatient or held under observation. Once you qualify, Part A covers up to 100 days per benefit period: $0 a day for the first 20, then $217 a day for days 21 through 100 in 2026.
Home health. Medicare covers skilled nursing plus physical, occupational and speech-language therapy at home if you need part-time or intermittent skilled care and you are homebound, which Medicare defines as needing a walker, a wheelchair or another person to leave, or leaving taking a major effort. Covered home health services cost you nothing. Nursing and aide services are generally limited to a combined 8 hours a day and 28 hours a week, with room to go up to 35 hours for short stretches.
Outpatient. Visits to a clinic a few times a week. This is where most rehabilitation in the United States takes place.
Timing, and the two programs people skip most
Two rehabilitation programs have randomized evidence behind them and still reach a minority of the people who qualify. Both are also sensitive to how fast you start.
Cardiac rehab: great evidence, poor attendance
A 2021 Cochrane review pooled 85 randomized trials covering 23,430 people with coronary heart disease. Within the first 6 to 12 months, exercise-based cardiac rehab reduced heart attacks, with a relative risk of 0.72 that the reviewers rated high certainty. It cut all-cause hospital admissions sharply, relative risk 0.58, meaning about 12 people had to go through a program to keep one person out of a hospital bed. Over follow-up beyond three years, the reviewers found a large reduction in cardiovascular death.
Two honest caveats come with that. The effect on death from any cause at 6 to 12 months was small and not statistically clear. And women made up under 15% of participants across those 85 trials, so the evidence base is heavily male.
Million Hearts, the national initiative run by the Centers for Disease Control and Prevention and the Centers for Medicare and Medicaid Services, describes a full program as 36 one-hour sessions and reports national participation running between 19% and 34%. Its stated target is 70%.
The distance between 19% and 70% is the actual story.
Million Hearts also reports differences that are hard to read as anything but a system failure. Among eligible patients, 19.6% of white patients take part, against 7.8% of Black patients. Black women are 60% less likely than white women to be referred and enrolled. People living outside metropolitan areas are 30% less likely to participate. People earning more than $75,000 a year are twice as likely to go as people earning under $15,000. And every day of waiting between the hospital and the first session makes a person 1% less likely to ever start.
One widely repeated figure needs a careful asterisk. Million Hearts reports that patients who attend all 36 sessions have a 47% lower risk of death than patients who attend only one. That comparison is observational, not randomized. People who finish 36 sessions differ from people who quit after one in health, transportation, money, work schedules and a dozen other ways. The randomized evidence above is the sturdier claim. Treat 47% as suggestive.
Medicare Part B covers cardiac rehab after a heart attack in the past 12 months, bypass surgery, stable angina, valve repair or replacement, angioplasty or stenting, a heart or heart-lung transplant, or stable chronic heart failure. In a doctor’s office you pay 20% of the Medicare-approved amount after the Part B deductible. In a hospital outpatient department you pay a copayment instead. A copay repeated 36 times is a real obstacle, and Million Hearts names cost-sharing as a barrier for most participants.
Pulmonary rehab does something an inhaler can’t
A Cochrane review by McCarthy and colleagues pooled 65 randomized trials with 3,822 people who had COPD. Pulmonary rehab beat usual care on every outcome measured. On the Chronic Respiratory Questionnaire, gains in breathlessness, fatigue, emotional function and sense of control over the illness all cleared the threshold researchers set for a change patients feel. Six-minute walking distance improved by roughly 44 meters, also past the clinical threshold.
The reviewers concluded that more trials comparing pulmonary rehab with usual care in COPD are not warranted. Translated: this question is settled, stop re-asking it.
MedlinePlus is clear about the limit. Pulmonary rehab does not replace medical treatment for lung disease, it works alongside it. Programs usually run as outpatient care in a hospital or clinic, start with testing of lung function and exercise capacity, and combine endurance and strength training with breathing strategies, energy-saving techniques for daily tasks, nutrition counseling and psychological support.
Medicare covers pulmonary rehab for moderate to very severe COPD, and also for people with confirmed or suspected COVID-19 who still have symptoms, including breathing problems, at least four weeks later.
Starting sooner usually wins
For stroke, the National Institute of Neurological Disorders and Stroke says rehabilitation usually begins in the hospital within 48 hours, often with exercises aimed at weakness or paralysis, and that relearning basic daily activities is the first step toward independence. MedlinePlus puts the same idea plainly: the sooner rehabilitation starts, the better the odds of regaining lost skills.
For cardiac rehab, the 1%-per-day decay in the odds of enrolling tells you the same thing from the other direction. Momentum is a clinical variable.
That cuts both ways. Starting earlier is generally better, but rehabilitation is not free of risk or cost. Sessions take hours. Travel is real. Exercise after a cardiac event is supervised for a reason. The trade-off is between a few months of inconvenience now and a measurable change in what you can do a year from now, and for cardiac and pulmonary rehab the randomized evidence lands firmly on the side of doing it.
Referrals, state law and what your plan demands
Two separate gates stand between you and a physical therapist, and people mix them up constantly.
The first gate is state law. Licensing and scope of practice are state functions, not federal ones. The National Center for Complementary and Integrative Health makes the general point bluntly: there is no standardized national system, each state decides, and what a licensed practitioner may legally do differs across state lines. Whether you can see a physical therapist without a physician’s referral, and for how many visits before one is required, is written into your state’s practice act. Your state licensing board is the authority on it. Do not take a clinic’s word.
The second gate is your insurance contract, which is separate and can be stricter. A plan can require a referral in a state that does not. Medicare requires outpatient therapy to run under a plan of care tied to a physician or other qualified practitioner, whatever your state allows.
Does going straight to a therapist cause harm? The most useful US evidence comes from the military, which has used physical therapists in a direct-access role since Vietnam. A project at seven clinics on Joint Base Lewis-McChord, reported in Military Medicine in 2022, ran direct-access physical therapy sick call for 18 months and logged 3,653 initial evaluations. The authors estimated roughly $3.6 million in avoided health care costs, with less imaging, fewer referrals to specialty care and fewer duty days lost. That is one system’s quality improvement project, not a randomized trial, and the population was young and fit. Read it as encouraging rather than conclusive.
When to call, and when to call right now
Rehabilitation is slow by design, so it helps to know which changes are part of the work and which are not.
Call your rehab team or your clinician the same day if you develop new weakness or numbness, if you fall, if you start coughing or choking on food, drinks or your own saliva, or if a joint that was improving suddenly swells, locks or will not bear weight.
Get emergency care for chest pain or pressure, severe shortness of breath at rest, fainting, a racing or irregular heartbeat that will not settle, or sudden trouble speaking, severe one-sided weakness or a sudden crushing headache.
There is a quieter signal too, and no official rule covers it. A reasonable self-check: if you have been in therapy for about six weeks and cannot name a single everyday activity you do better now than when you started, something is off in the plan, the dose or the fit. Ask for a reassessment, and ask whether a physiatrist should look at the whole picture.
Six questions before you leave the hospital
Ask these out loud and write the answers down.
- Which type of rehabilitation am I being sent to, and which setting: inpatient rehab, skilled nursing, home health or outpatient?
- Am I admitted as an inpatient, and for how many nights? Get this in writing. It decides whether Medicare will pay for a skilled nursing stay.
- Who makes the first appointment, me or your office? Get the phone number before you walk out either way.
- What should I be able to do in four weeks that I cannot do today? You want a function answer, not a visit count.
- What will each visit cost me, and how many does my plan cover this year?
- If I need to stop or pause, who do I tell, and how do I restart?
The one thing to take with you
Rehabilitation is not the soft, optional part of recovery. For heart and lung disease it is among the better-tested treatments available, with randomized trials behind it, and it still reaches a minority of the people who qualify for it.
So if you are discharged with a rehab referral, treat the first phone call as part of the treatment rather than as paperwork, and make it the same week. The Million Hearts finding that each day of delay shaves a percentage point off your odds of ever starting is the most usable number in this article.
And when you call, ask the question that rehabilitation is built to answer. Not how long will this take. What will I be able to do at the end of it.
Sources
- MedlinePlus, National Library of Medicine. “Rehabilitation.” medlineplus.gov
- MedlinePlus, National Library of Medicine. “Cardiac Rehabilitation.” medlineplus.gov
- MedlinePlus, National Library of Medicine. “Pulmonary Rehabilitation.” medlineplus.gov
- MedlinePlus, National Library of Medicine. “Stroke Rehabilitation.” medlineplus.gov
- National Institute of Neurological Disorders and Stroke. “Stroke Recovery.” ninds.nih.gov
- Medicare.gov. “Inpatient Rehabilitation Care.” medicare.gov
- Medicare.gov. “Skilled Nursing Facility (SNF) Care.” medicare.gov
- Medicare.gov. “Home Health Services.” medicare.gov
- Medicare.gov. “Cardiac Rehabilitation Programs.” medicare.gov
- Medicare.gov. “Pulmonary Rehabilitation Programs.” medicare.gov
- Million Hearts, U.S. Department of Health and Human Services. “Cardiac Rehabilitation At A Glance.” millionhearts.hhs.gov
- Million Hearts, U.S. Department of Health and Human Services. “Optimizing Care: Cardiac Rehabilitation.” millionhearts.hhs.gov
- U.S. Bureau of Labor Statistics. “Occupational Outlook Handbook: Physical Therapists.” bls.gov
- U.S. Bureau of Labor Statistics. “Occupational Outlook Handbook: Occupational Therapists.” bls.gov
- U.S. Bureau of Labor Statistics. “Occupational Outlook Handbook: Speech-Language Pathologists.” bls.gov
- American Academy of Physical Medicine and Rehabilitation. “FAQs About Physiatry.” aapmr.org
- American Occupational Therapy Association. “What Is Occupational Therapy?.” aota.org
- National Center for Complementary and Integrative Health. “Credentialing, Licensing, and Education.” nccih.nih.gov
- PubMed. “Dibben G, et al. "Exercise-based cardiac rehabilitation for coronary heart disease." Cochrane Database of Systematic Reviews, 2021. DOI: 10.1002/14651858.CD001800.pub4.” doi.org
- PubMed. “McCarthy B, Casey D, Devane D, et al. "Pulmonary rehabilitation for chronic obstructive pulmonary disease." Cochrane Database of Systematic Reviews, 2015. DOI: 10.1002/14651858.CD003793.pub3.” doi.org
- PubMed. “Fliegner MA, et al. "Interhospital variability in cardiac rehabilitation use after cardiac surgery among Medicare beneficiaries." The Journal of Thoracic and Cardiovascular Surgery, 2024. DOI: 10.1016/j.jtcvs.2024.04.019.” doi.org
- PubMed. “Szymanek E, Jones M, Shutt-Hoblet C, Halle R. "Implementation of Direct Access Physical Therapy Within the Military Medical System." Military Medicine, 2022. DOI: 10.1093/milmed/usab245.” doi.org