Getting a medication approved by insurance typically involves understanding why it was denied, gathering the right documentation, and working through a structured process with your doctor’s office. Most denials happen because the insurer requires extra justification, not because the medication can never be covered. The key is knowing which steps to take and in what order.
Why Insurance Denies Medication in the First Place
Insurance companies don’t cover every drug automatically. They maintain a list of approved medications called a formulary, and drugs not on that list require extra steps. Even drugs on the formulary can be denied if the insurer wants proof that cheaper alternatives were tried first or that the prescribed dose is appropriate. The most common reasons for a medication denial are prior authorization requirements, step therapy (also called “fail first”) protocols, quantity limits, and the drug simply not being on the formulary at all.
Understanding which of these applies to your situation determines your next move. Your denial letter is required to tell you why the claim was rejected, so read it carefully before doing anything else.
Prior Authorization: The Most Common Hurdle
Prior authorization means your insurer wants your doctor to justify the prescription before they’ll pay for it. This is the single most frequent reason medications get held up. Your doctor’s office submits a request to the insurance company that includes your diagnosis, medical history, and the clinical reason this specific drug is necessary.
Response times vary by plan type. For urgent requests, insurers are generally required to respond within 24 to 72 hours. Standard, non-urgent requests can take up to 7 calendar days for a decision. If your situation is time-sensitive, make sure your doctor’s office marks the request as expedited and explains why.
The most important thing you can do at this stage is stay in contact with your doctor’s office. Many prior authorization requests stall not because of a medical issue but because paperwork sits in a queue. Call your doctor’s office to confirm the request was submitted, then call your insurer a few days later to confirm they received it.
Step Therapy and How to Get Around It
Step therapy requires you to try one or more lower-cost medications before your insurer will approve the one your doctor actually prescribed. For example, you might need to try a generic version of a drug before the brand-name version is covered. The logic is cost-based: insurers want evidence that cheaper options don’t work for you before paying for expensive ones.
You can request an exemption from step therapy in several situations. If you’ve already tried and failed the required medication in the past, you shouldn’t have to try it again. If you’re currently stable on a medication and switching could cause harm, that’s also grounds for an exemption. Your doctor will need to document these circumstances in writing. Some states have passed laws limiting how aggressively insurers can enforce step therapy, so it’s worth checking your state’s rules, particularly if you have a rare or serious condition.
Requesting a Formulary Exception
If your medication isn’t on your plan’s formulary at all, you can request a formulary exception. This is a formal process where your doctor argues that the non-formulary drug is medically necessary for your specific situation. According to federal rules for Medicare Part D and many other plans, a formulary exception should be granted when your prescriber can demonstrate that all the drugs on the formulary would be less effective for your condition or would cause adverse effects.
Your doctor can submit a supporting statement verbally or in writing, though a written statement is stronger and creates a paper trail. The statement should explain why formulary alternatives won’t work for you specifically, referencing your medical history, previous treatments, and any side effects you’ve experienced. There’s no single required form. Your doctor can use the plan’s own exception request form, a standard coverage determination form, or simply write a letter.
What Makes a Strong Letter of Medical Necessity
Whether you’re dealing with prior authorization, step therapy, or a formulary exception, the letter of medical necessity from your doctor is the most critical document in the process. A vague letter gets denied. A specific one gets approved. Here’s what a strong letter includes:
- Your diagnosis and accepted conditions, described clearly with relevant diagnostic codes
- A medical explanation of why you need this specific medication, linking it directly to your condition
- Previous treatments you’ve tried, including the drug names, how long you were on them, and why they didn’t work (side effects, lack of improvement, allergic reactions)
- Results from a recent exam, ideally within the last six months, showing your current level of function or symptoms
- Expected duration of the treatment and what improvement looks like
The letter should make it impossible for a reviewer to conclude that an alternative drug would work just as well. If your doctor has tried other options with you and they failed, every detail of those failures should be documented. If lab results or imaging support the need for this drug, those should be referenced or attached. Generic statements like “this medication is necessary” without supporting evidence are the most common reason these letters fail.
How to Appeal a Denial
If your initial request is denied, you have the right to appeal. Fewer than 1% of denied claims are actually appealed, according to KFF data from ACA marketplace plans in 2024. Of those that were appealed, about 34% resulted in the denial being overturned. That means roughly one in three people who bother to appeal get a different outcome, which makes appealing well worth the effort.
The appeal process has two main stages: internal and external.
Internal Appeal
You have 180 days from receiving your denial notice to file an internal appeal. During this stage, your insurer reviews the decision again, often with a different reviewer. For prior authorization denials, the insurer must respond within 30 calendar days. For urgent situations, they have a maximum of 72 hours. Individual market plans have one level of internal appeal; group plans through an employer may have one or two levels.
When you file, include everything you submitted the first time plus anything new. An updated letter from your doctor, additional medical records, peer-reviewed studies supporting the use of your medication for your condition, and documentation of failed alternatives all strengthen your case. Don’t just resubmit the same paperwork and hope for a different result.
External Review
If your internal appeal is denied, you can request an external review. This sends your case to an independent review organization that has no financial relationship with your insurer. You have at least four months from receiving the final internal denial to file. The independent reviewer must issue a decision within 45 days for standard reviews, or within 72 hours for expedited reviews involving urgent medical needs.
An external review is your strongest tool because the reviewer is genuinely independent. The insurer is bound by whatever the external reviewer decides. If you’ve reached this stage, it’s worth asking your doctor to write the most detailed, evidence-backed letter possible.
Gold Card Programs in Some States
A handful of states, including Texas and West Virginia, have passed “gold card” laws that allow doctors with consistently high prior authorization approval rates to skip the process entirely for certain services. The idea is straightforward: if a doctor’s requests are approved 90% or more of the time, requiring them to submit paperwork for every prescription wastes everyone’s time. A federal version called the Gold Card Act was reintroduced in the U.S. House in 2023, targeting Medicare Advantage plans. In practice, the impact of existing state laws has been limited due to strict qualification criteria and flexibility in how plans define what counts as prior authorization.
If Insurance Won’t Cover It at All
When every appeal is exhausted and the medication still isn’t covered, manufacturer patient assistance programs are worth exploring. Most major pharmaceutical companies run programs that provide medications for free or at reduced cost to people who meet income requirements. These programs operate outside your insurance benefit, meaning they don’t interfere with your existing coverage. Your doctor’s office can often help you apply, or you can search the manufacturer’s website directly for their patient assistance program.
Nonprofit organizations like NeedyMeds and the Patient Access Network Foundation also maintain databases of assistance programs organized by medication and condition. Some pharmacies offer discount programs or can help you find coupons that bring the out-of-pocket cost down significantly, even without insurance coverage.
A Practical Timeline to Follow
If your medication was just denied, here’s the order of operations. First, read your denial letter to identify the exact reason. Second, call your doctor’s office and let them know. If it’s a prior authorization issue, ask them to submit the request with a detailed letter of medical necessity. If it’s step therapy, ask your doctor to document any previous medication failures and request an exemption. If the drug isn’t on the formulary, request a formulary exception with a supporting statement from your prescriber.
If the request is denied, file an internal appeal within 180 days, adding new documentation. If that’s denied, file for external review within four months. Throughout this process, keep copies of every letter, form, and phone call summary. Write down the name of every representative you speak with and the date of the conversation. Insurance appeals are paperwork battles, and the person with the best records has the advantage.