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For anyone facing a coverage decision · Licensed in 20 U.S. states

Medically necessary,
made simple.

“Medically necessary” is the test a health plan uses to decide whether it will pay for care. HealthCare.gov defines it as services or supplies needed to diagnose or treat an illness, injury, condition, disease, or its symptoms that meet accepted standards of medicine. Each plan writes its own version, though, and that wording can decide whether a claim gets paid. Here's how it works and what to do if a plan says no.

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What it means

A coverage test,
written by each plan.

HealthCare.gov, Florida regulators, and federal claims rules explain it this way:

It is a standard, not a promise.

A benefit your plan covers still has to meet the plan's medical necessity rules to be paid. The Florida Department of Financial Services describes medically necessary care as care needed to maintain or resume good health, and notes that many policies will only pay for medically necessary treatment.

Your plan sets the definition.

Federal rules give the example of a plan that pays for extra physical therapy visits only when a treatment plan is approved under the plan's own definition of medical necessity. Your policy or plan documents spell out the wording that applies to you.

You can ask why.

When most plans deny a claim as not medically necessary, federal claims rules say the notice must explain the clinical judgment behind it, or say that you can get that explanation free on request. That reasoning is where an appeal starts.

Physical therapist stretching a patient's leg during a session — Photo: Pexels photo 20860588 by Funkcinės Terapijos Centras, used under the Pexels License. Cropped, resized, and converted to WebP. Modified from the original.

Common gray areas

Where medical necessity questions tend to come up.

These points summarize 45 CFR 147.136, 29 CFR 2560.503-1, and the CMS fact sheet on the Women's Health and Cancer Rights Act, read November 3, 2026. Each plan sets its own criteria, so check your plan documents.

More visits than the plan's limit. A plan may cover a set number of therapy visits, then require approval for more based on its medical necessity rules.
A higher level of care. A plan may question whether care fits the setting, such as an overnight stay instead of an outpatient visit. Federal rules list health care setting and level of care as medical judgment calls.
Treatment called experimental. A plan may decline a service it considers experimental or investigational. Federal rules treat that as a medical judgment too, which matters if you appeal.
Care that looks cosmetic. Some care that changes appearance must be covered. Under the Women's Health and Cancer Rights Act, if the law applies to you and you get mastectomy benefits, coverage must include breast reconstruction you choose.

The rules

Medical necessity rules,
in three numbers.

180 days

The time you have to file an internal appeal after a notice that your claim was denied, per HealthCare.gov.

4 months

The time you have to ask in writing for an external review after a final denial, per HealthCare.gov.

What it costs to get the clinical reasoning behind a medical necessity denial on request, under federal claims rules.

Deadlines from HealthCare.gov, internal appeals and HealthCare.gov, external review. Notice and review rules from 29 CFR 2560.503-1 and 45 CFR 147.136. Definition from HealthCare.gov, medically necessary. Read November 3, 2026.

Paul DanielsLicensed health advisor · NPN 20986580

Working with Paul

We help you read
the plan rules.

Daniels Health Advisors is the independent brokerage Paul Daniels founded, licensed in 20 U.S. states. When you're choosing coverage, we help you find where each plan explains prior approval, covered services, and exclusions, so you know the rules before you need care. That goes for Marketplace plans and private PPO options. We aren't your doctor or your lawyer, and only your plan decides a claim. Some private plans ask health questions, and approval is not guaranteed. Some may not cover care for health problems you had before you enrolled.

If you're planning a surgery, therapy, or a costly scan, ask your doctor's office whether your plan needs approval first and which records it wants to see.

Plan rules explained before you choose
Licensed in 20 U.S. states · Paul Daniels, NPN 20986580 · FL license G065122
You do not pay us for our help. We are paid by the insurance companies when you enroll. Your price for a plan is the same whether you use us or sign up on your own. Commissions can differ by company.

Your first call

Choosing a plan with medical necessity in mind.

Tell us your needs

The care you expect and the doctors you use.

We check the rules

Approvals, visit limits, and exclusions in each plan.

Pick with eyes open

A plan whose rules fit the care you need.

Book a 15-minute call

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If a plan says no

What to do if a plan
says it isn’t necessary.

A denial is not always the last word. Read the notice for the reason and the plan standard it relied on, and ask for the clinical reasoning if it isn't there. HealthCare.gov suggests sending added information, such as a letter from your doctor, with an internal appeal. If the plan still says no, a denial based on medical judgment can go to an independent external review. Our prior authorization guide covers the appeal steps in more detail. After the call you will have:

Where each plan explains prior approval
Which of your services may need approval first
The appeal and external review deadlines
A plan comparison built around the care you expect

A checklist for

Getting care approved the first time.

Ask your doctor's office whether the service needs prior approval from your plan.
Make sure the office sends the records and notes the plan asks for.
Keep a copy of every request, notice, and letter.
If a claim is denied, write down the appeal deadline from the notice right away.

Medical necessity questions

Medically necessary FAQ.

What does medically necessary mean in health insurance?

HealthCare.gov defines medically necessary care as health care services or supplies needed to diagnose or treat an illness, injury, condition, disease, or its symptoms that meet accepted standards of medicine. Each plan also has its own definition in its documents, and that is the wording it applies to your claims.

Who decides if something is medically necessary?

Your doctor recommends the care, but your plan decides whether it will pay, using its own criteria. If you disagree, you can appeal. For a denial based on medical judgment, you can usually ask for an external review by an independent reviewer after the plan's internal appeal.

Why would a plan say care is not medically necessary?

Common reasons include missing records, care in a setting the plan sees as more than you need, more visits than the plan allows without approval, or a treatment the plan considers experimental. The denial notice should state the reason.

What is a letter of medical necessity?

It's a letter from your doctor explaining why you need a treatment, often with your history and test results. HealthCare.gov lists a letter from your doctor as information you can send with an internal appeal. Some plans also ask for one with a prior approval request.

Is cosmetic surgery ever medically necessary?

Some care that changes appearance must be covered. Under the Women's Health and Cancer Rights Act, if the law applies to you and you get benefits for a mastectomy, coverage must include breast reconstruction if you choose it. For other care, your plan's definitions decide.

Do I have to wait for open enrollment?

Not for every plan. A private plan (not from the Marketplace) can often be bought any time of year. Some private plans ask health questions, and approval is not guaranteed. Some may not cover care for health problems you had before you enrolled. Marketplace plans, and other plans that follow ACA rules, work differently. As of November 3, 2026, under current law, open enrollment for 2027 plans on HealthCare.gov runs from November 1, 2026, to January 15, 2027. To start coverage January 1, pick a plan by December 15. States that run their own Marketplace may set different dates, so check with your state's Marketplace. A federal appeal about these rules is pending (City of Columbus v. Kennedy, 4th Cir. No. 26-1938; argued October 30, 2026, with no ruling as of November 3, 2026), so confirm the dates before you enroll. Outside open enrollment, you need a special enrollment period, such as one after losing job-based coverage.

Know the rules
before you need care.

Book a 15-minute call to compare how plans handle approvals and coverage, or see quotes online.

Book a 15-minute call Get a quote online

By Paul Daniels, licensed insurance agent (NPN 20986580).

Disclaimer

Daniels Health Advisors LLC is an independent brokerage, not a carrier, HealthCare.gov, or CMS. Agent: Paul Daniels, NPN 20986580, Florida license G065122. This page explains medical necessity in general, as of November 3, 2026. Your plan documents set the definitions and criteria that apply to you, and your plan decides claims. Appeal deadlines come from HealthCare.gov and can differ by plan and state, so follow the dates on your notice. Some older grandfathered plans follow different appeal rules. Tax credits, plans, networks, and prices depend on your state, zip code, income, and household. We never guarantee approval, a doctor, or a price. Not medical, legal, or tax advice.

Medically necessary,made simple.

A coverage test,written by each plan.