What Is Hospital Observation Status?

Not All Hospital Stays Are Considered Inpatient Care

Woman hospitalized in observation status being checked on by her doctor.

Caiaimage / Robert Daly / Getty Images

When a patient is put into the hospital, they’re assigned a status. Inpatient status and observation status—which is technically an outpatient designation—are the two most common.

When you're admitted to the hospital, it's not always easy to figure out if you've been admitted as an inpatient, or considered an outpatient under hospital observation status.

Woman hospitalized in observation status being checked on by her doctor.
Caiaimage / Robert Daly / Getty Images

The Difference Between Inpatient Status & Observation Status

Inpatient status is what we typically think of as someone being admitted to the hospital. Observation status is a type of outpatient status. However, someone in hospital observation status can spend multiple days and nights actually inside the hospital, even though they're technically an outpatient. In fact, they might be in the very same type of hospital bed, right next door to someone who is considered an inpatient. 

Observation used to be a way to keep someone in the hospital for a short time while healthcare providers tried to decide if they were sick enough to need inpatient treatment. Now, observation patients can sometimes be kept in the hospital for days on observation status. It's easy to see how this can be confusing for patients since we don't tend to think of "outpatient" as involving an overnight stay in the hospital.

Why Does Inpatient vs. Observation Matter?

If you're sleeping in the same hospital ward and getting the medical treatment you need, why should you care whether you're on inpatient status or observation status? You should care because the difference could cost you hundreds or thousands of dollars.

For people on Medicare, the distinction between inpatient and observation status is crucial in terms of the out-of-pocket costs for that care, but also for the coverage of care in a skilled nursing facility after the hospital stay. This is described in more detail below.

Your health insurance company or Medicare won’t pay for your hospital stay as an observation patient in the same manner it would have paid as an inpatient. Instead, they’ll pay for your hospital stay using the outpatient services part of your health insurance benefit. With a commercial insurance plan, you might not notice much of a difference. But if you're enrolled in Original Medicare (Part A and Part B), the difference could be very significant.

Your share of costs for outpatient services like observation status could be larger than your share of costs for inpatient hospitalization.

Although complex and confusing, there are rules, or at least guidelines, your healthcare provider and hospital follow when deciding whether to assign you hospital observation status or inpatient status.

To understand how the observation guidelines work and why hospitals are assigning patients to observation status, see why you’ll pay more.


Mr. Smith comes to the emergency room with chest pain. Unable to tell for sure whether or not Mr. Smith is having a heart attack, the cardiologist, Dr. Jones, puts Mr. Smith into the hospital on observation status.

Mr. Smith spends the night in a hospital room attached to a heart monitor. Throughout the night, nurses check on him regularly. He gets oxygen and has blood tests drawn every few hours. Dr. Jones may even have ordered more extensive tests to determine the condition of Mr. Smith's heart.

Late the next evening, after two days and one night in the hospital, Dr. Jones has enough information to determine that Mr. Smith didn't have a heart attack. Mr. Smith is sent home.

Mr. Smith's health insurance company pays for part of his hospital stay charges under Mr. Smith's outpatient services benefit coverage. (If Mr. Smith has Medicare, Medicare Part B will cover 80% of the Medicare-approved cost of the services Mr. Smith received during his observation stay, assuming he's already paid his Part B deductible for the year.)

In this case, let's say that Mr. Smith's health insurance policy has a 25% coinsurance for outpatient services. So Mr. Smith pays for 25% of the charge of every blood test and X-ray. He also pays 25% of the charge for oxygen, of the charge for heart monitoring, and of the hospital's hourly charges for outpatient observation services.

If Mr. Smith had received the same exact services as an inpatient rather than on observation status, depending on the type of coverage he has, he may have owed a single hospitalization copayment and his health insurance would have covered the rest of the charges.

But it's also common for health insurance plans to count hospitalization towards the plan's deductible, and then begin assessing coinsurance charges. In that case, the total amount that Mr. Smith owed may have ended up roughly similar either way.

Under Original Medicare, in 2021, Mr. Smith would pay $1,484 for his hospital stay if he were considered an inpatient, plus Part B costs for physician services that he received during his time in the hospital (that's a $203 annual deductible, plus 20% of the Medicare-approved amount of the physician services).

But if he's considered an outpatient and his stay is classified as an observation stay, he'll owe the $203 Part B deductible (assuming he hasn't already met it earlier in the year) plus 20% of all Medicare-approved costs associated with his stay. So his costs under observation would depend on how much care was provided to him, and how many tests were run (many Medicare enrollees also have supplemental coverage, in the form of Medigap coverage, Medicaid, or retiree health benefits from a previous employer, which pick up some or all of the out-of-pocket costs under Medicare).

Inpatient vs. Observation and Medicare Coverage of Skilled Nursing Facility Care

Patients are sometimes well enough to leave the hospital, but not yet well enough to return home. Skilled nursing facilities can be used to fill this gap. A patient who has a knee replacement, for example, might only need a few days in the hospital, but may still need a stepped-down level of care at a skilled nursing facility before being able to return home.

Original Medicare only pays for care in a skilled nursing facility if it's preceded by at least a three-day inpatient hospital stay (Medicare Advantage plans can waive this requirement, and CMS has also waived it for "people who experience dislocations, or are otherwise affected by COVID-19.")

If you're in the hospital but under observation status rather than inpatient status, it doesn't count towards your three days. In that case, once you're released, you won't be able to get Medicare coverage for a stay in a skilled nursing facility.

This is one of the reasons it's important for patients and their families to understand whether inpatient or observational status is being used. This three-day inpatient requirement can be confusing for patients, especially if they don't understand how a stay in the hospital can still be classified as outpatient care.

Consumer advocates, lawmakers, and even the head of the Centers for Medicare and Medicaid Services have indicated that addressing this issue is a priority, so it remains to be seen whether the three-day rule will continue to apply in the future (and as noted above, it has been waived for people affected by COVID-19).

But for the time being, it's still important for patients, especially if they have Medicare, to understand whether their hospital stay is classified as inpatient or observation.

There is an appeals process available, however, for patients with Medicare whose hospital stay was classified as observation, and a subsequent skilled nursing facility stay was not covered. This stems from a court ruling that was issued in 2020, and it applies to medical care dating back to 2009 (the lawsuit took several years to make its way through the court system).

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8 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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  2. Puri I. Observation versus inpatient status. The Hospitalist. September 17, 2019.

  3. Medicare.gov. Medicare Costs at a Glance.

  4. Medicare.gov. Are You a Hospital Inpatient or Outpatient? August 2018.

  5. Managed Care. Medicare Advantage Takes On 3-Day Rule. September 13, 2015.

  6. Centers for Medicare and Medicaid Services. COVID-19 Emergency Declaration Blanket Waivers for Health Care Providers. March 2020.

  7. American Health Care Association. Observation Stays Updates.

  8. Bunis, Dana. AARP. Judge Rules for Patients in Medicare "Observation Status" Lawsuit. April 1, 2020.

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