
The distinction between inpatient and outpatient hospital stays is important because it affects costs and insurance coverage. Outpatient treatment generally refers to patients who leave the hospital on the same day as their treatment, although it can also refer to those who spend the night in the hospital but have not been admitted as an inpatient. Inpatient treatment, on the other hand, refers to patients who are admitted to the hospital for at least two midnights. Observation status is a type of outpatient category where patients are admitted to the hospital, but it is unclear if they will need longer care. This designation can be given to patients who are extremely sick and spend several days in the hospital.
Characteristics of inpatient, outpatient, and observation status
| Characteristics | Values |
|---|---|
| Inpatient | - A person treated in a hospital and admitted for at least two midnights. |
| - Inpatient care can also be applied to a person who was discharged or transferred to another hospital before two midnights and didn't occupy the bed. | |
| Outpatient | - A person leaves the hospital after treatment on the same day. |
| - Outpatient status can also be applied to someone who spends the night in the hospital for whom a doctor has not written an order for inpatient admission. | |
| Observation | - A person is admitted to the hospital but has an unclear need for longer care. |
| - The purpose is to determine within the span of one midnight whether further treatment or inpatient admission is needed. |
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What You'll Learn
- Inpatient status is when a person is admitted to a hospital for at least two midnights
- Outpatient status is when a person leaves the hospital on the same day as their treatment
- Observation status is when a person's need for longer care is unclear
- Billing and insurance coverage vary for inpatient and outpatient statuses
- Medicare Outpatient Observation Notice (MOON) is given to patients who are outpatients receiving observation services

Inpatient status is when a person is admitted to a hospital for at least two midnights
The inpatient status of a patient is determined by their condition, treatment recommendation, and insurance plan. Inpatient status is when a person is admitted to a hospital for at least two midnights. However, there are nuances to this definition. Firstly, the inpatient status is largely directed by the patient's insurance company and the medical codes that classify their condition and treatment, known as CPT and ICD-10 codes. These codes determine whether the patient's treatment is authorized for coverage and whether it will be administered on an inpatient or outpatient basis. If inpatient care is indicated, the codes will specify the authorized length of stay.
Secondly, while an overnight hospital stay generally indicates inpatient treatment, there are exceptions. A person who spends the night in a hospital but does not have a doctor's order for inpatient admission is still considered an outpatient. Additionally, a patient's status can change during their stay. For example, if a patient is admitted for emergency care, they may initially be classified as requiring hospital observation. However, if it is later decided that further treatment is needed after the overnight stay, their status can be changed to inpatient.
The distinction between inpatient and outpatient status is significant because it affects billing and costs. The billing category of inpatient, outpatient, or observation determines the amount the patient will be required to pay. For instance, the copayment for a single outpatient hospital service may be lower than the inpatient hospital deductible, but the total copayment for multiple outpatient services may exceed the inpatient deductible. Therefore, it is important for patients to understand their status and confirm this with the hospital and their doctor or caregiver.
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Outpatient status is when a person leaves the hospital on the same day as their treatment
The status of a patient as an outpatient or inpatient is important as it affects how much they pay for hospital services, such as X-rays, drugs, and lab tests. The patient's insurance plan determines the cost of their hospital stay.
A person is considered an outpatient if they leave the hospital on the same day as their treatment. This status also applies if they spend the night in the hospital but a doctor has not written an order for inpatient admission. In this case, they are still admitted and billed as an outpatient. Outpatient status can also be applied to someone who receives emergency department services, outpatient surgery, lab tests, or X-rays, and any other hospital services where the doctor has not written an order for inpatient admission.
In contrast, an inpatient is someone who is admitted to the hospital for at least two midnights. This status also applies if they are discharged or transferred to another hospital before two midnights and didn't occupy the bed. Inpatients are billed as such.
Observation status is when a person is admitted to the hospital, but it is unclear if they need longer care. The purpose is to determine within one midnight whether further treatment or inpatient admission is required. Observation services are considered hospital outpatient services, and a patient may be billed for them. A hospital must provide a Medicare Outpatient Observation Notice (MOON) if a patient is receiving outpatient observation services for more than 24 hours. The MOON informs the patient that they are an outpatient and explains why they are receiving observation services instead of being admitted as an inpatient.
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Observation status is when a person's need for longer care is unclear
The status of a patient as an inpatient or outpatient in a hospital affects how much they pay for hospital services, such as X-rays, drugs, and lab tests. A patient's hospital status may also determine whether Medicare will cover care in a skilled nursing facility following their hospital stay.
Observation status is when a person is admitted to a hospital but has an unclear need for longer care. The purpose is to determine within the span of one midnight whether further treatment or inpatient admission is needed. In other words, observation services are hospital outpatient services provided while the doctor decides whether to admit a patient as an inpatient or discharge them.
Observation status is a designation used by hospitals to bill Medicare. This designation can hurt hospital patients who rely on Medicare for their healthcare coverage. For example, Medicare only covers nursing home care for patients who have had a three-day inpatient hospital stay, and observation status does not count towards this.
The decision for inpatient hospital admission is a complex medical decision based on a doctor's judgment and a patient's need for medically necessary hospital care. An inpatient admission is generally appropriate when a patient is expected to need two or more midnights of medically necessary hospital care. However, the doctor must order such admission, and the hospital must formally admit the patient for them to be considered an inpatient.
It is important to note that the definition of inpatient or outpatient status can place individuals in different billing categories, and insurers will determine what form of treatment they will cover and for how long based on the CPT and ICD-10 codes assigned by healthcare providers.
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Billing and insurance coverage vary for inpatient and outpatient statuses
The billing and insurance coverage for inpatient and outpatient statuses differ in several ways. Firstly, the length of hospital stay is a key factor in determining billing and insurance coverage. Inpatient status typically requires an overnight stay or admission for at least two midnights in a hospital, while outpatients receive treatment and leave on the same day. Observation status falls in between these two categories, where patients are monitored for up to one midnight to determine if further inpatient treatment is required.
Secondly, the type of treatment and services received influence billing and insurance coverage. Inpatient care often involves more comprehensive services, including emergency room visits, surgery, and extended hospital stays. Medicare Part A usually covers inpatient hospital care if the patient is formally admitted with a doctor's order and the hospital accepts Medicare. There are specific cost structures for inpatient care, with the first 60 days being free after meeting the Part A deductible, followed by daily charges for days 61-90 and beyond.
On the other hand, outpatient services typically include emergency or observation services, laboratory tests, mental health care, radiology services, and medical supplies. Medicare Part B covers many of these diagnostic and treatment services received as an outpatient from a hospital that accepts Medicare. However, it's important to note that Part B generally does not cover prescription drugs administered in an outpatient setting. Outpatients may pay more for services received in a hospital outpatient setting compared to a doctor's office, but the hospital outpatient copayment cannot exceed the inpatient deductible amount.
Additionally, the patient's insurance plan and specific codes assigned by healthcare providers impact billing and coverage. CPT and ICD-10 codes are used to classify the patient's condition and treatment, which insurers use to determine what services are authorized for coverage and whether they fall under inpatient or outpatient categories. These codes also dictate the length of authorized inpatient stays.
Lastly, the patient's status as inpatient or outpatient affects the overall cost of hospital services, including X-rays, drugs, and lab tests. Even if a patient spends the night in a hospital, they may still be considered an outpatient and billed accordingly. Therefore, it is important for patients to understand their status and confirm their inpatient or outpatient categorization with their doctor or hospital during their stay.
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Medicare Outpatient Observation Notice (MOON) is given to patients who are outpatients receiving observation services
The Medicare Outpatient Observation Notice (MOON) is a notice that hospitals and Critical Access Hospitals (CAHs) are required to provide to individuals receiving observation services as outpatients. This notice informs the patients that they are outpatients and not inpatients, and outlines the implications of this status. This includes information on cost sharing and coverage for post-hospitalisation skilled nursing facility (SNF) services.
The NOTICE Act, enacted on August 6, 2015, mandates that hospitals provide this notification to individuals who have been receiving observation services as outpatients for more than 24 hours. The MOON must be delivered in writing and orally, with the patient or their representative signing to acknowledge receipt. If the patient or their representative refuses to sign, a staff member must sign to certify that notification was presented.
The MOON is designed to address the often unclear distinction between inpatient and outpatient status. This distinction is important because it affects Medicare coverage and costs. For example, Medicare only covers nursing home care for patients who have had a 3-day inpatient hospital stay, and observation status does not count towards this requirement. As a result, patients classified as outpatients on observation status may be responsible for their entire hospital bill if they are not enrolled in Medicare Part B.
The MOON is a standardised notice developed by the Centers for Medicare & Medicaid Services (CMS) and must be used by hospitals and CAHs. It is provided to patients no later than 36 hours after observation services are initiated. The MOON contains information on the reasons for the patient's outpatient status and the implications of this status. Hospitals must retain a copy of the signed MOON and provide the patient with a paper copy of the signed notice.
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Frequently asked questions
An inpatient is someone who is admitted to the hospital for at least two midnights. An outpatient is someone who leaves the hospital on the same day as their treatment. If you spend the night in the hospital but a doctor has not written an order for inpatient admission, you are still admitted and billed as an outpatient.
Observation status is when a person is admitted to the hospital but it is unclear if they need longer-term care. The purpose is to determine within one day whether further treatment or inpatient admission is needed. Observation status falls under the outpatient category.
The determination of outpatient, inpatient, and observations is based on your condition and treatment recommendation. Your insurer will use CPT and ICD-10 codes assigned by your healthcare provider to determine what form of treatment they will cover and how many days of hospitalization are needed.


































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