To get medication approved by insurance, confirm the drug is on your plan’s formulary, have your prescriber submit a prior authorization request with clear medical necessity documentation, and appeal in writing if the plan says no. Most approval fights are won on paperwork: the right form, the right clinical detail, and the right deadlines. A surprising share of initial denials get reversed once the missing pieces show up.
Start With the Formulary
Before your prescription ever reaches the pharmacy counter, look up whether the drug is on your plan’s formulary. Every insurer publishes this list, and you can usually find it by logging into your member portal and using the drug search tool. You’ll see the tier the drug sits in, any restrictions attached to it, and roughly what you’ll pay. If the search tool isn’t obvious, call the member services number on the back of your card and ask directly.
Checking first tells you which path you’re on. If the drug is covered without restrictions, you’re done thinking about approval. If it carries a prior authorization requirement, a step therapy rule, or a quantity limit, your doctor’s office can start that paperwork during the same appointment. If the drug isn’t on the formulary at all, you’ll need a formulary exception, and knowing that now saves you the surprise of being turned away at the pharmacy.
Plans also spell out quantity limits and refill windows in the summary of benefits. A plan may cover only a 30-day supply, or require a waiting period between refills. Knowing those rules upfront prevents a rejected claim later.
Getting Prior Authorization Approved
Prior authorization is the single most common reason prescriptions get delayed. Insurers require it most often for brand-name drugs, medications with high misuse potential, and treatments where cheaper alternatives exist. Without approval, the insurer refuses to pay and you owe the full retail price.
The request comes from your doctor’s office, submitted by fax, phone, or an electronic portal. It has to include your diagnosis, relevant medical history, and the clinical reasoning for this specific drug. Insurers typically want to see diagnosis codes, lab results, and documentation of any medications you’ve already tried. Use the plan’s own prior authorization form rather than a generic letter; requests on the correct form move faster.
How quickly the plan must respond depends on your coverage. Under a CMS final rule taking effect in 2026, Medicare Advantage, Medicaid, and CHIP plans must decide urgent requests within 72 hours and standard requests within seven calendar days.1Centers for Medicare & Medicaid Services. CMS Interoperability and Prior Authorization Final Rule Commercial plan timelines vary by state, though 72 hours is the prevailing standard when your doctor marks the request urgent because a delay would seriously harm your health.
While the request is pending, ask the pharmacy about an emergency fill. Many pharmacists can dispense a few days’ supply, and some insurers authorize a short bridge while paperwork is processed. Don’t stop taking a medication you’re already on because the authorization hasn’t caught up.
Handling Step Therapy
Step therapy requires you to try a lower-cost drug first before the insurer will approve the one your doctor actually prescribed. If the first drug doesn’t work or causes side effects, you move to the next option. In practice, this can force patients to spend weeks on medications their doctors already know won’t be the right fit.
Bypassing step therapy requires a formal override request from your prescriber. More than 30 states have passed laws giving patients the right to skip it under specific circumstances. The usual grounds:
- You’ve already tried the required drug, on this plan or a previous one, and it didn’t work, stopped working, or caused side effects.
- The required drug is likely to cause harm given your medical history or other medications.
- You’re already stable on the prescribed drug and switching would be medically risky.
- Based on your diagnosis, the required drug is expected to be ineffective.
The stronger the clinical evidence, the faster the override is approved. If your doctor switched you off a drug that failed, make sure that failure is clearly documented in your records before the request goes in.
What Medical Necessity Documentation Should Include
Whether the request is a straight prior authorization, a step therapy override, or a formulary exception, the central question the insurer asks is whether the drug is medically necessary. That means it’s appropriate for your condition, consistent with accepted medical standards, and not a matter of preference. Your doctor carries most of the weight here, but knowing what the plan expects helps make sure nothing is missed.
A strong case includes your diagnosis with the supporting test results, a record of other treatments tried and why they failed, and a clear explanation of why this specific drug is needed. Your doctor should spell out what happens if the medication is withheld, particularly if your condition would worsen or become harder to treat with delay.
A formal letter of medical necessity from your prescribing physician, separate from the standard form, adds real weight. The letter should read like a compact case study: diagnosis, treatment history, why alternatives won’t work, and the specific clinical reasons this drug is the right choice. The requests that get approved tend to be detailed and specific rather than boilerplate.
Off-label prescriptions (using a drug for a condition the FDA hasn’t specifically approved it for) are harder but not impossible. Many states require insurers to cover off-label uses when the drug is recognized in standard medical references or supported by peer-reviewed research. Citing published studies and clinical guidelines from recognized medical organizations strengthens the request.
Appealing a Denial
A denial is not the end of the process. It’s often the point at which coverage decisions actually get made, because the appeal is where the full clinical picture finally lands in front of someone empowered to reverse the initial call.
You have 180 days from the date of the denial notice to file an internal appeal.2HealthCare.gov. How to Appeal an Insurance Company Decision – Internal Appeals Put the appeal in writing. Include your name, claim number, and insurance ID, and attach everything that supports your case: the doctor’s statement explaining why the drug is necessary, relevant medical records, lab results, and whatever prior authorization paperwork was already submitted. If the initial denial happened because documentation was incomplete, this is where you fill in the gaps.
The insurer must decide the appeal within 30 days for standard prior authorization situations and within 72 hours for urgent cases where waiting could seriously jeopardize your health.3Centers for Medicare & Medicaid Services. Has Your Health Insurer Denied Payment for a Medical Service – You Have a Right to Appeal A denial at this stage comes with a written explanation and information about your right to escalate.
One tactic that often breaks a stalemate: have your doctor request a peer-to-peer review, a phone call between your prescriber and the insurer’s medical director. Denials that seemed final on paper sometimes reverse in a single conversation once the clinical picture is explained directly.
External Review After the Internal Appeal
If the internal appeal fails, you can request an external review. An independent third party, not anyone employed by your insurer, evaluates whether the denial was justified, and the decision is legally binding on the insurer.
You generally have four months from the final internal denial to request the review. Standard reviews must be decided within 45 days; expedited reviews for life-threatening situations must be completed within 72 hours. Filing fees are either zero or capped at $25, depending on whether your review runs through the federal process or a state-run program.4HealthCare.gov. External Review Your denial letter should tell you where to send the request. Submit medical records, physician statements, and any supporting research. The reviewers are medical professionals with no financial stake in the outcome, which is why external review carries the weight it does.
Getting Help With Your Appeal
You don’t have to do this alone. The Patient Advocate Foundation offers free case management for people with chronic or serious illnesses dealing with insurance denials.5Patient Advocate Foundation. Where to Start if Insurance Has Denied Your Service and Will Not Pay Many states also run consumer assistance programs through their insurance departments that can walk you through the paperwork and deadlines.
Approval Under Medicare and Medicaid
Medicare Part D uses different terminology but follows a similar logic. Instead of prior authorization, you request a coverage determination. If the drug isn’t on the formulary, request a formulary exception. If it’s on the formulary but in an expensive tier, request a tiering exception to get it at lower cost sharing. Either way, your prescriber must submit a supporting statement explaining that the preferred drugs would be ineffective or cause adverse effects.6Centers for Medicare & Medicaid Services. Exceptions
For Medicaid, states maintain their own preferred drug lists, and non-preferred drugs commonly require prior authorization. In emergencies, the pharmacy must dispense a 72-hour supply while the authorization is processed, and the state must respond within 24 hours. Medicaid managed care plans currently must issue standard decisions within 14 days and expedited decisions within 72 hours, with the CMS interoperability rule tightening standard decisions to seven days starting in 2026.1Centers for Medicare & Medicaid Services. CMS Interoperability and Prior Authorization Final Rule
Bringing the Cost Down After Approval
Even once a drug is approved, the out-of-pocket cost can still hurt. A few programs help.
Manufacturer copay cards are the most widely available form of help for commercially insured patients. Drug companies use them to reduce your copay or coinsurance on brand-name medications, sometimes down to $0. They typically limit the number of refills or the total dollar amount per year. One important restriction: these cards are not available to patients on Medicare, Medicaid, or other government insurance.
Independent nonprofit foundations, including the Patient Access Network Foundation, offer grants to cover copays and coinsurance for patients with specific diseases. Eligibility is income-based, with thresholds varying by disease fund but generally falling between 300% and 500% of the federal poverty level. Funding cycles open and close quickly, so apply as soon as you have an approved prescription.
If You’re Switching Plans Mid-Treatment
Changing insurance mid-treatment creates a real risk that a medication you’ve been taking for months suddenly needs a new authorization or isn’t covered at all. Before open enrollment closes, check the new plan’s formulary for your medication’s tier, any prior authorization requirements, and whether your pharmacy is in the preferred network.
As of January 2026, major insurers have committed to honoring existing prior authorizations for a 90-day transition period when patients switch plans. If your new insurer tries to cut off a medication you’ve been stable on, request a transition supply and have your doctor submit new prior authorization paperwork immediately. Keep dated records of the switch, the transition supply request, and every communication with the insurer.