The CMS Two-Midnight Rule and Medical Necessity Criteria (2024)

The Two-Midnight Rule

The CMS two-midnight rule is a Medicare policy that provides guidance related to determining when a patient is eligible for inpatient hospital care. Under the rule, a patient is generally eligible for inpatient care if the admitting physician expects the patient to require hospital care that crosses two midnights. This means that the patient’s stay is expected to last at least 48 hours.

The two-midnight rule was adopted to correct high error rates for inpatient stays that were not medically necessary as well as extended outpatient “observation” services, which cost patients more money out of pocket for Skilled Nursing Facility (SNF) stays. The rule also helps to ensure patients receive the appropriate level of care, as observation care is typically less invasive and intensive than inpatient care.

There are a few exceptions to the two-midnight rule, which we’ll share in more detail in the next section. There are also times when inpatient resources are needed, but the stay will not be over 2 midnights.

For example, a patient may be admitted as an inpatient even if the expected length of stay is less than two midnights, as the claim may qualify for a case-by-case exception such as:

      • Inpatient only procedure
      • Increased risk of an adverse event
      • High risk medication that can only be given in an inpatient setting

The two-midnight rule is not always easy to apply, as it can be difficult to predict how long a patient will need to stay in the hospital. In these cases, the admitting physician must use their clinical judgment to determine whether the patient meets the criteria for inpatient care.

Two-Midnight Rule Expectation and Exceptions

When an admitting practitioner expects that the patient will require medically necessary hospital care spanning 2 or more midnights, but it does not occur, providers are expected to have sufficient documentation in the medical record to support their clinical judgement.

Examples of documentation that can support a two-midnight stay:

    • The patient’s condition requires the constant attention of a nurse or other healthcare professional.
      • For example, new mechanical ventilation required.
    • The patient is at risk of serious complications if they are not in the hospital.
    • Documentation to support severity of clinical condition, including plan of care and estimated time to complete treatment.
      • Make sure to include comorbid conditions that influence the condition.
      • Documentation must make the reason for an inpatient stay apparent.
    • The patient needs to receive a procedure that can only be performed in an inpatient setting.
    • Unforeseen circ*mstances that interrupt an inpatient stay, like a transfer, death, etc.

For those scenarios where a patient will require intense resource utilization of the hospital personnel/resources, and the expected length of stay is less than two-midnights, an exception may be made on a case-by-case basis. If a patient has a significant risk for an adverse event and requires intensive monitoring – and there is documentation supporting the decision in the medical record – reimbursem*nt may be granted.

Some examples of an adverse event that is expected to be resolved in less than two-midnights is an acute medical condition such as:

    • a life-threatening arrhythmia and not improving with ED treatment,
    • pulmonary embolism with right ventricular strain, or
    • an acute surgical condition that is life threatening.

The medical necessity must be documented well in the medical record using the admitting clinician’s clinical judgment to make the best decision for the patient.

The Role of MCG and Interqual

MCG and InterQual are two of the most used medical necessity criteria for hospital admissions. These criteria are developed by independent organizations and are based on the latest medical evidence.

MCG and InterQual provide a list of conditions that are medically necessary for inpatient care. They also provide the “why” of what should be documented for a patient to be admitted as an inpatient for a particular condition.

The use of MCG and/or InterQual can help to ensure that patients receive timely and appropriate healthcare.

Two-Midnight Rule for Medicare Advantage Plans

According to the recent CMS final rule for CY 2024, Medicare Advantage (MA) plans must follow the two-midnight rule in 2024. They must provide coverage when an admission is based on complex medical factors that are documented in the chart, and the admitting clinician feels that the care will require at least two-midnights.

The MA plans will continue to require documentation of medical necessity, which has not been defined by CMS.

The CMS two-midnight rule is a complex policy that can be difficult to apply. However, it is an important tool for ensuring that patients receive the appropriate level of care and that Medicare payments are made in accordance with the law.

With these recent rulings, it is clear that CMS is committed to finding a way to balance the need to ensure that patients receive the appropriate level of care with the need to control healthcare costs.

Using hospital admission software like AdmissionCare helps assure compliant bed status decisions and appropriate reimbursem*nts. By integrating medical necessity criteria like MCG and Interqual into the clinician’s workflow in the EHR, AdmissionCare is a seamless way to ensure medical necessity is documented for every admitted patient.

The CMS Two-Midnight Rule and Medical Necessity Criteria (2024)

FAQs

The CMS Two-Midnight Rule and Medical Necessity Criteria? ›

According to the rule: Inpatient services are considered appropriate if the physician expects the patient to require medically necessary hospital care spanning at least 2 midnights. Inpatient services are also appropriate if the physician is providing a service listed as "inpatient only" by Medicare.

What is the two-midnight benchmark for CMS? ›

§ 412.3, which include a “two-midnight benchmark” (meaning that patients must be in the hospital for at least “two midnights” before being admitted for inpatient care).

What is the 2 midnight rule for medical necessity? ›

The 2MN rule states that a hospital inpatient admission is generally considered reasonable and necessary if the physician (or other qualified practitioner) orders an inpatient admission based on the expectation that the patient will require at least two midnights of medically necessary hospital care.

What is the 2 midnight rule for Medicare Advantage plans? ›

The two-midnight rule requires patients to be admitted as an inpatient if the treating clinician determines they require hospital care that extends beyond two midnights — rather than being held under observation status as an outpatient.

What is the CMS medical necessity rule? ›

Medical Necessity - Rehabilitation

Services must be under accepted standards of medical practice and considered to be specific and effective treatment for the patient's condition. The amount, frequency, and duration of the services planned and provided must be reasonable.

What is the 2 midnight rule change? ›

Starting this year, private Medicare plans have to cover their members' hospitalizations at the higher inpatient rate if their doctors predict they'll have to stay beyond two midnights. It's the same rule — appropriately called the two-midnight rule — that traditional Medicare has followed for a decade.

What is the CMS oversight of the two-midnight rule for inpatient admissions? ›

To reduce inpatient admission errors, CMS implemented the Two-Midnight Rule in fiscal year 2014. Under the Two-Midnight Rule, CMS generally considered it inappropriate to receive payment under the inpatient prospective payment system for stays not expected to span at least two midnights.

What are the guidelines for medical necessity? ›

"Medically Necessary" or "Medical Necessity" means health care services that a physician, exercising prudent clinical judgment, would provide to a patient. The service must be: For the purpose of evaluating, diagnosing, or treating an illness, injury, disease, or its symptoms.

When did CMS enact the two-midnight rule? ›

The two-midnight rule, enacted in 2013, states that traditional Medicare must pay for an inpatient stay if admitting clinicians anticipate patients will remain in the hospital for at least “two midnights.” Beginning this year, Medicare Advantage insurers must also follow the rule.

What is the final rule of CMS 2024? ›

On April 4, 2024, the Centers for Medicare & Medicaid Services (CMS) issued a final rule that revises the Medicare Advantage Program, Medicare Prescription Drug Benefit Program (Medicare Part D), Medicare Cost Plan Program, Programs of All-Inclusive Care for the Elderly (PACE), and Health Information Technology ...

What is the 60 day rule for Medicare Advantage? ›

While these overpayments may not be your fault, they expose your lab to the risk of liability under the Affordable Care Act (ACA) rule requiring providers to report and return all Medicare and Medicaid overpayments within 60 days of identifying them.

Can you have Medicare and an Advantage plan at the same time? ›

If you join a Medicare Advantage Plan you'll still have Medicare, but you'll get most of your Part A and Part B coverage from your Medicare Advantage Plan, not Original Medicare.

What is the 60 rule for Medicare? ›

Specifically, to be classified for payment under Medicare's IRF prospective payment system, at least 60 percent of a facility's total inpatient population must require IRF treatment for one or more of 13 conditions listed in 42 CFR 412.29(b)(2).

What are the four factors of medical necessity? ›

The determination of medical necessity is made on the basis of the individual case and takes into account: Type, frequency, extent, body site and duration of treatment with scientifically based guidelines of national medical or health care coverage organizations or governmental agencies.

What does Medicare consider a medical necessity? ›

Medically necessary services: Services or supplies that are needed to diagnose or treat your medical condition and that meet accepted standards of medical practice. Preventive services: Health care to prevent illness (like the flu) or detect it at an early stage, when treatment is most likely to work best.

What is considered not medically necessary? ›

Examples of services or treatments a plan may define as not medically necessary include cosmetic procedures, treatments that haven't been proven effective, and treatments more expensive than others that are also effective.

What are CMS benchmarks? ›

Benchmarks are the point of comparison we use to score the measures you submit. Your performance on each measure is compared to its benchmark to determine how many points the measure can earn. Benchmarks are specific to each collection type even if the measure is the same.

What is the 2 midnight rule for transfers? ›

If the patient does require care beyond the two midnights and now meets the medical criteria for a full inpatient admission continued stay, the Centers for Medicare & Medicaid Services' two-midnight rule requires that the patient be converted to an inpatient level of care.

How to count midnights for Medicare? ›

Hospitals count the admission day but not the discharge day.

To count inpatient days, use the midnight-to-midnight method when a day begins at midnight and ends 24 hours later. A part of any day, including the admission day and the day a patient returns from a leave of absence, counts as a full day.

What are Medicare benchmarks? ›

• Benchmarks are the annual. established maximum payments set by the CMS that health plans bid against to provide coverage of Medicare Part A and Part B services for Medicare beneficiaries. • The benchmark is the average.

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