
Determining what is deemed medically necessary is a crucial aspect of healthcare and insurance. While the specific definitions may vary depending on location and insurance provider, the general understanding is that medically necessary services are those required to diagnose, treat, or prevent an illness, injury, disease, or condition and its symptoms. These services must adhere to accepted standards of medical practice and be clinically appropriate and effective for the patient. Preventive care may also fall under medically necessary services, but this is often subject to the specific terms of insurance plans. Ultimately, the determination of medical necessity is guided by healthcare providers' clinical judgment and the patient's individual needs.
| Characteristics | Values |
|---|---|
| Definition | "Medically Necessary" or "Medical Necessity" refers to health care services that a health care provider, exercising prudent clinical judgment, would provide to a patient. |
| Purpose | For the purpose of evaluating, diagnosing, or treating an illness, injury, disease, or its symptoms. |
| Standards | In accordance with the generally accepted standards of medical practice. |
| Clinical Appropriateness | Clinically appropriate in terms of type, frequency, extent, site, and duration, and considered effective for the patient's illness, injury, or disease. |
| Patient-Centred | Care must be patient-centered and take into account the individual's needs, clinical and environmental factors, and personal values. |
| Preventive Care | Preventive care may be medically necessary but coverage is governed by the terms of the applicable plan documents. |
| State Definitions | States can establish their own parameters for medical necessity decisions as long as they are not more restrictive than federal statutes. |
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What You'll Learn

Preventative care
In the context of health insurance, preventative care services may include screenings, immunizations, and other measures that aim to prevent illness or detect issues early on. For example, lung cancer screening for adults aged 50 to 80 who are at high risk due to smoking, or PrEP (pre-exposure prophylaxis) HIV prevention medication for HIV-negative adults at high risk of contracting HIV. These services can help identify potential health risks and allow for early intervention, potentially improving health outcomes and reducing future healthcare costs.
Most health plans are required to cover a set of preventative services, such as shots and screening tests, at no cost to the patient. This includes plans available through the Health Insurance Marketplace. However, it is important to note that these services are typically only free when delivered by a provider within the patient's plan network.
The determination of medical necessity for preventative care may vary among insurance providers. Generally, it refers to health care services that a healthcare provider, exercising prudent clinical judgment, would provide to a patient. These services should be for the purpose of evaluating, diagnosing, or treating an illness, injury, or disease, and they should be in accordance with generally accepted standards of medical practice. Additionally, they should be clinically appropriate and considered effective for the patient's specific health needs.
It is always advisable to review your insurance plan's Evidence of Coverage (EOC) booklet to understand what specific preventative care services are included and excluded from coverage. This can help individuals make informed decisions about their healthcare and ensure they are utilizing the benefits available to them.
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Individual needs and values
Health insurance is a crucial factor in gaining access to healthcare. While it is not the only factor, it does have a direct effect on an individual's ability to receive care. In the United States, health insurance is linked to improved health outcomes, including lower death rates, better health, and improved productivity.
The importance of health insurance is particularly evident for specific populations, such as the elderly, disabled, children, and pregnant women. For these groups, access to healthcare is essential and often socially valued. Insurance coverage can improve their health and overall quality of life.
However, the decision-making process behind what is deemed "medically necessary" is complex and varies across different insurance providers. For instance, Cigna Healthcare defines "Medically Necessary" or "Medical Necessity" as health care services that a healthcare provider, using prudent clinical judgment, would provide to a patient. These services must align with the Medical Necessity Criteria, be clinically based, and patient-centered, taking into account the individual's needs, clinical and environmental factors, and personal values.
On the other hand, Aetna, another insurance provider, offers the Applied Behavior Analysis (ABA) Medical Necessity Guide to determine appropriate levels and types of care for patients requiring evaluation and treatment for behavioral health conditions. Despite this, Aetna clarifies that the guide does not constitute medical advice, and members must refer to their benefit plans to understand coverage limitations and exclusions.
Ultimately, the determination of medical necessity is influenced by a combination of clinical judgment, the patient's individual needs and values, and the specific criteria set by insurance providers.
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Accepted standards of medical practice
The standard of care is a legal term, not a medical one, referring to the degree of care a prudent and reasonable person would exercise under the circumstances. The generally accepted standards of medical practice are based on credible scientific evidence published in peer-reviewed medical literature and recognised by the relevant medical community. These standards are also consistent with the standards set forth in policy issues involving clinical judgment.
In the United States, the generally accepted standards of medical practice are based on credible scientific evidence published in peer-reviewed medical and/or behavioural health literature and recognised by the relevant medical community. These standards are also consistent with physician or behavioural health specialty society recommendations and any other relevant factors determined by statute(s) and/or regulation(s).
The standard of care is relevant in medical malpractice lawsuits. To prevail in a malpractice case, the plaintiff must prove all four of the following elements: Duty, Breach, Cause, and Harm. The standard of care is not relevant in all liability actions that can be brought against clinicians. For example, in government investigations, the sole question is whether the psychiatrist under investigation followed the law, not what other psychiatrists are doing.
In the context of medical necessity, generally accepted standards of medical practice refer to health care services that a health care provider, 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. It should be clinically appropriate in terms of type, frequency, extent, site, and duration, and considered effective for the patient's condition. Additionally, it should not be primarily for the convenience of the patient or the healthcare provider and should be cost-effective, with alternatives considered.
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State definitions and coverage
The federal statute does not define "medical necessity" but instead describes a broad standard for coverage without providing a prescriptive formula for determining necessity. States can set their own parameters for medical necessity decisions as long as they are not more restrictive than the federal statute. All states now define medical necessity in their Medicaid programs, and generally, these services are defined as those that improve or lessen the impact of a condition, prevent a condition, or restore health.
State Medicaid programs are required to provide Medicaid enrollees under 21 with comprehensive and preventive health care services through the Early Screening and Periodic Screening, Diagnostic and Treatment (EPSDT) benefit. Services for children are covered under the EPSDT benefit if deemed medically necessary for the individual beneficiary. Federal law requires states to cover, under the EPSDT benefit, "necessary health care, diagnostic services, treatment, and other measures to correct or ameliorate defects and physical and mental illnesses and other conditions discovered by the screening services, whether or not such services are covered under the State plan."
Medicare and private insurers have varying criteria for determining whether a procedure is medically necessary based on the patient's circumstances. Original Medicare uses National Coverage Determinations for some services and Local Coverage Determinations (made by local Medicare Administrative Contractors). Medicare Advantage plans set their own prior authorization and medical necessity guidelines, but their requirements cannot be more restrictive than those used by Original Medicare. Private insurers that offer non-Medicare plans can set their own criteria, although they must comply with state and federal benefit mandates.
Preventative care may be deemed medically necessary, but coverage is governed by the terms of the applicable plan documents. For example, Cigna Healthcare states that all treatment decisions made in alignment with Medical Necessity Criteria must be clinically based, patient-centred, and take into account the individual's needs, clinical and environmental factors, and personal values.
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Insurance policy exclusions and limitations
Understanding what your insurance policy does not cover is just as important as knowing what it does. Exclusions and limitations can vary depending on the insurance provider and the type of insurance. Here are some common exclusions and limitations found in insurance policies:
Geographic Limitations
Some insurance policies may only provide coverage for medical treatment received in specific geographic locations. If an individual requires treatment outside the covered area, they may need to pay out of pocket. It is important to carefully review the policy's terms and conditions to understand any geographic limitations.
Pre-existing Conditions
A pre-existing condition is a health issue for which an individual received treatment or exhibited symptoms requiring medical care before the effective date of their insurance coverage. Most insurance policies deny coverage for claims related to pre-existing conditions.
Maternity-Related Expenses
Most health insurance policies do not cover maternity-related expenses, including childbirth, prenatal and postnatal care, and infertility treatments. However, some policies offer coverage for these expenses, typically at a higher premium.
Mental Health and Substance Abuse
Mental health care was traditionally excluded from health insurance coverage in certain places, such as Hong Kong. While this is changing, many insurance providers still offer limited coverage for mental health and substance abuse treatment, which may not cover all associated costs.
Dental and Optical Care
Dental procedures are generally not covered by health insurance plans unless they are necessary due to accidental injuries or are an integral part of reconstructive surgery, such as cleft palate procedures. Optical coverage is also rarely provided, with most plans excluding refractive eye surgery for correcting refractive defects.
Experimental or Investigative Services
Insurance policies typically do not cover experimental or investigative services and supplies that are not generally recognized under standard medical care. However, there may be exceptions for routine patient care costs associated with clinical trials for conditions like cancer.
It is important to carefully review the specific exclusions and limitations of your insurance policy to understand what is and is not covered. These provisions can significantly impact your coverage and financial responsibilities in the event of a medical issue.
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Frequently asked questions
"Medically Necessary" or "Medical Necessity" refers to health care services or supplies that a health care provider, exercising prudent clinical judgment, would provide to a patient. This includes services or supplies needed to diagnose or treat an illness, injury, condition, disease, or its symptoms, and that meet accepted standards of medicine.
When determining medical necessity, a healthcare provider will consider the purpose of the service or treatment, whether it is to evaluate, diagnose, or treat an illness, injury, disease, or its symptoms. They will also consider whether the service or treatment is in accordance with generally accepted standards of medical practice and is clinically appropriate in terms of type, frequency, extent, site, and duration. Additionally, the patient's individual needs, clinical and environmental factors, and personal values may be taken into account.
Insurance coverage for medically necessary services or treatments can vary depending on the insurance plan and applicable laws and regulations. In the United States, each state can define medical necessity for its Medicaid program, and preventive care may be covered as medically necessary under certain plans. It is important to review the specific terms and exclusions of your insurance policy to understand what services or treatments are covered.



























