What prior authorization means before care

This is not clinical evidence and not medical advice. It does not replace your care team. Discuss anything here with your clinician before you act on it. Prior authorization is approval from your health plan that may be required before you get a service or fill a prescription — otherwise the plan may not cover it. Plans also call it prior approval or precertification. The plan is deciding whether the care looks medically necessary under its rules. Emergency care is the usual exception. Approval still is not a promise the plan will pay the bill.

For most scans, procedures, and specialty visits, the clinic or hospital billing / authorization desk usually sends the request. You may still need to sign forms or confirm insurance details. For many drugs, you or your prescriber contact the plan. Medicare drug coverage rules say you and/or your prescriber must get the plan’s approval before certain prescriptions are covered, and the prescriber may need to show the drug is medically necessary. On a Medicare Advantage plan, you or your provider can also ask in advance whether a service, drug, or supply is covered — that advance decision is an organization determination, and sometimes that request is the prior authorization itself.

Whatever the plan lists for that service or drug — and it varies. Under a CMS final rule, certain payers must implement a Prior Authorization API that can identify documentation requirements for items and services (not drugs) beginning January 1, 2027. That is separate from the 2026 decision timeframes in the next question. Until those APIs are in place — and for plans outside the rule — clinics still follow each plan’s current checklist. In practice the clinic packet usually includes diagnosis codes, the ordered service or drug, and clinical notes that support medical necessity. If the request is incomplete, the plan may ask for more information or deny. For Marketplace drug exceptions, HealthCare.gov says your doctor generally must confirm that covered alternatives have not worked or will not work, are likely to cause harmful side effects, or that a dose limit does not fit your situation.

It depends on your plan type and whether the request is standard or urgent — and drug requests often follow different clocks than medical services. For many Medicare Advantage, Medicaid, and CHIP plans, federal rules starting in 2026 require prior authorization decisions on medical items and services within 72 hours for expedited (urgent) requests and seven calendar days for standard ones. Those same rules require a specific reason when the request is denied. Qualified Health Plan issuers on the Federally Facilitated Exchanges are outside that timeframe requirement, and the rule’s decision-time and denial-reason provisions do not apply to drug prior authorizations. Always check your plan materials or member services for the clock that applies to your request.

On Original Medicare (Parts A and B), you usually do not need prior authorization for Medicare to cover services or supplies. On a Medicare Advantage plan, you may need the plan’s approval before it covers certain services or supplies. Most Advantage plans also include Part D drug coverage, which can add prior authorization, step therapy, or quantity limits for specific drugs. On a HealthCare.gov Marketplace plan, prior authorization may be required for some services or prescriptions before the plan covers them — check your Summary of Benefits and Coverage, the plan’s drug list (formulary), and the insurer’s website, or call the number on your card.

Step therapy is a type of prior authorization used mainly for drugs. The plan may require you to try a less expensive drug on its formulary that works for most people with your condition before it will cover a more expensive one — sometimes a generic or biosimilar first. A formulary is simply the plan’s list of covered prescription drugs. You or your prescriber can ask the plan for an exception to step therapy or another coverage rule; the prescriber must send a supporting statement. If the exception is approved, the plan covers the prescribed drug even if you did not try the lower-cost step first.

Ask the pharmacist what the reject code or notice says, and whether the clinic already started a prior authorization or coverage determination. Under Medicare drug coverage, if the pharmacy cannot fill the prescription as written, it should give you a notice explaining how you or your doctor can ask the plan for a coverage decision, including an exception. You can also ask the plan for that decision before you go to the pharmacy so you know coverage ahead of time. On a Marketplace plan, ask whether a one-time refill or the plan’s drug exceptions process applies, and whether the plan will give temporary access to the drug while the exception is pending. Call the clinic’s prescription or authorization desk the same day so the supporting statement does not sit unsent.

At the clinic: Was the prior auth submitted? On what date? For which exact service or drug? Do you have a reference or authorization number? Is the plan waiting on more clinical notes, labs, or imaging? Who on your team owns follow-up? At the insurer (member services on your card): What is the status? Is this standard or expedited? What decision timeframe applies to this request under my plan? What additional documents, if any, are still missing? If your situation is urgent, ask the clinic whether they can request an expedited decision and what the plan needs to treat it as urgent.

Read the denial notice for the specific reason and the instructions on how to dispute it. HealthCare.gov says insurers must tell you why they denied a claim or ended coverage and how you can challenge the decision. You generally have a right to an internal appeal, and then to an external review by an independent third party. Starting in 2026, certain federal payers must include a specific reason when they deny a prior authorization for medical items and services, which can help the clinic resubmit with missing information or start an appeal. This page stops at that pointer — deadlines, urgent appeals, and external review steps live on Triangle’s denials-and-appeals answers and the appeal how-to guide.

Keep every approval, denial, and “more information needed” letter or portal message. Save the date the clinic submitted the request, any reference or authorization number, what service or drug was listed, and who you spoke with at the clinic and the plan (name, title, date). Screenshots of a pending pharmacy reject and copies of clinical notes or forms the clinic sent help if you later appeal or ask for a resubmission. Prefer copies when you mail or upload something; keep your own set. Medicare & You notes that, starting January 1, 2027, some plans may process prior authorization electronically with decisions visible in a patient portal — ask your clinic whether they already use those tools.