Medical Policies: The Coverage Details You Need But Don't Have (Yet)
The prior authorization denial arrives. It says the procedure isn't "medically necessary."
You pull out your benefits documentation or look online. The treatment you are pursuing is listed as a covered benefit when it is considered "medically necessary". You then find the definition of medically necessary, which says nothing about any particular treatment.
So where are the specifics? What do you and your care team need to do to prove "medically necessary"? The specifics live in a document your health plan almost certainly didn't give you when you enrolled. It's called a medical policy (your plan may also refer to "coverage policy" or "clinical policy bulletin") , and in my work navigating prior authorization requests and claims and advocating for the care that patients deserve, finding and using these documents represent a significant step in the game plan.
This is Part 1 of a two-part series. Here I'll cover what medical policies are and how they sit alongside your other plan documents. Part 2 will cover the practical side: how to use the policy that applies to you.
Your health coverage actually lives in three places
When you enroll in a health plan, you typically receive a few documents or have access to them through your plan's website or your employer. But there's another layer that you will not receive, and it's the one that governs many of the decisions that matter most.
The Summary of Benefits and Coverage (SBC) is a standardized four-to-six page form that most health plans are required to provide (example). It lists covered and not-covered services, your deductibles and out-of-pocket maximums, and a handful of coverage examples. Think of it as a quick-reference card. It'll confirm that bariatric surgery is a covered benefit, for example, but it won't tell you a thing about what you have to do to get it approved.
The Evidence of Coverage, Benefits Booklet, Certificate of Coverage, or Summary Plan Description is the full contract (example). Usually 50 to 200 pages. This is where definitions, exclusions, appeals rights, and coverage rules live. It will define "medical necessity" and "medically necessary" in broad language. It may note that the plan uses clinical guidelines or medical policies to make coverage determinations. What it won't do is tell you the specific clinical criteria for bariatric surgery, or genetic testing, or a sleep study, or most other services that require prior authorization.
Medical Policies are the third layer (example). Different insurers use different names for them: Blue Cross Blue Shield plans often call them "medical policies," Cigna calls them "coverage policies," and Aetna refers to "clinical policy bulletins." Whatever the name, they serve the same function: they're the detailed, service-specific documents that spell out whether a service qualifies for coverage (in their eyes and according to the policy).
There are hundreds of them at any major insurer (example). One for bariatric surgery. One for sleep studies and CPAP equipment. One for spinal cord stimulators. One for genetic testing. One for transcranial magnetic stimulation. The list goes on, and the documents themselves can run to many pages of eligibility criteria, documentation requirements, and step therapy rules. Their intended audience is clinicians, not patients. You can usually find them by googling "Your insurance company bariatric surgery medical policy."
How the documents connect and why it matters
Your benefits documentation almost certainly contains language like "incorporated by reference", "subject to guidelines", "must meet the criteria for coverage that are defined in each medical policy that applies", or "for more information on xyz treatment refer to the plan name medical policy".
These phrases are doing significant work.
They mean the criteria in a medical policy carry the same contractual weight as anything else in your benefits booklet. You're bound by them. Your provider's documentation is evaluated against them. A prior authorization denial will be based on them, even if you've never seen the document. These documents are where the operational criteria live, and that's what reviewers work from.
For a member pursuing bariatric surgery, for example, the practical implication is this: The benefits booklet may say the surgery is covered when "medically necessary." The medical policy defines what that means for this specific procedure. At Blue Shield of California, for example, the bariatric surgery medical policy specifies BMI thresholds, required co-morbid conditions, and documentation of a prior physician-supervised weight loss program. Patients and their care teams must meet the specific criteria in the medical policy. If your documentation doesn't line up with those criteria precisely, the authorization or claim can be denied even when the surgery is clinically appropriate.
Check out my earlier post about navigating bariatric surgery coverage for more on this scenario and how the coverage criteria impacts patients and their care teams.
Medical Necessity
One critical component in nearly every medical policy is medical necessity. Here's how Cigna defines it in their coverage policies, which is representative of what you'll find across most major insurers. A service is medically necessary when it is:
For the purpose of evaluating, diagnosing, or treating an illness, injury, disease, or its symptoms
In accordance with the generally accepted standards of medical practice
Clinically appropriate, in terms of type, frequency, extent, site, and duration, and considered effective for the patient's illness, injury, or disease
Not primarily for the convenience of the patient, health care provider, or other physicians or health care providers
Not more costly than an alternative service or sequence of services at least as likely to produce equivalent therapeutic or diagnostic results as to the diagnosis or treatment of that patient's illness, injury, or disease
Many patients, caregivers, and advocates are familiar with the often-frustrating times that insurers deny a service or medication not because it won't work, but because a less expensive alternative might work. Health plans often stipulate that you try and fail a less expensive option before they agree to pay for others; this is referred to as "step therapy". This is where many patients get tripped up, or caught in Catch-22's. Documentation and proactive coordination with your care team are critical. And the details are in these medical policy documents.
Using the bariatric surgery example, the medical policy combines medical necessity criteria with specific documentation requirements: physician notes from a supervised diet program, results of a psychological evaluation, a documented history of conservative weight loss attempts, and in some cases letters from multiple specialists. The surgery may be covered in principle. The patient may be an appropriate clinical candidate. The prior authorization can still be denied if the documentation doesn't match what the policy requires.
Who writes them and how often they change
Medical policies at large health plans are developed by their clinical teams: physician medical directors, nurses, pharmacists, and clinical reviewers. Most major plans also draw on external clinical guideline sources, particularly the MCG Health guidelines (formerly Milliman Care Guidelines) and the InterQual criteria sets, which are widely used in the industry as reference standards for medical necessity determinations. Specialty society guidelines, peer-reviewed research, and FDA determinations for drugs and devices all feed into the process.
Most major insurers review their medical policies on an annual cycle, though updates can happen more frequently when significant new clinical evidence emerges, a new device or drug receives FDA approval, or coverage requirements change. Cigna notes explicitly on their coverage policies page that "medical technology is continuously evolving; our coverage policies are subject to change without prior notice."
Retain the medical policy document active at the time of your health plan's decision. Let's say the policy becomes more restrictive over time; you don't want to rely on the plan to retrieve the proper documents or even doubt yourself ("I swear this wasn't there when I read it"). Note your insurance company is obligated to send you all of the guidelines they used to make a decision, so you will get it, but errors and delays do happen.
Note that some services that sit at the intersection of dental and medical coverage, like oral surgery or sleep apnea treatment using a dental appliance, may be evaluated under medical policies through your health plan rather than your dental plan. This is an area that often creates hassles for patients and their providers; in general, any potentially gray areas require careful documentation, follow-up, and persistence.
What's coming in Part 2
Now that you understand what medical policies are, how they fit into your coverage, and why they carry contractual weight even when they were never handed to you, Part 2 will cover the practical side: how to find the medical policy that applies to your situation, what the documents actually look like and how to read them, and how to get the right document.
If you're navigating a denial or preparing for a procedure right now and need help working through it, please reach out. Peak Health Advocates handles this for clients every day. peakadvocates.com/contact
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