Step therapy is an insurance cost-control strategy that requires you to try one or more lower-cost medications before your plan will cover the drug your doctor originally prescribed. Often called a “fail-first” policy, it means you must use a cheaper alternative, demonstrate that it doesn’t work for you, and only then get approval for the treatment your provider recommended. The practice is common in both commercial and Medicare Advantage health plans, and it has become significantly more widespread in recent years.
How Step Therapy Works
Health insurers organize covered medications into tiers on what’s called a formulary. Drugs on the preferred tiers are typically older, generic, or less expensive options. Non-preferred tiers contain newer, brand-name, or specialty medications that cost the insurer more. Step therapy forces you to move through these tiers in order, starting with the cheapest option.
Here’s a practical example: your dermatologist prescribes a biologic injection for moderate-to-severe psoriasis. Before your insurer covers it, they require you to first try a topical cream, then an oral medication, and possibly phototherapy. Only after you’ve documented that each of those treatments failed can you access the biologic your doctor originally wanted you on. In some cases, insurers require trials of two or more alternative drugs, each for a set period, before granting coverage for the prescribed treatment.
Step therapy operates through prior authorization, the process where your insurer reviews and approves a treatment before agreeing to pay for it. The difference is that standard prior authorization asks whether a drug is medically appropriate, while step therapy adds a specific sequence: you must prove you tried and failed cheaper options first, regardless of what your doctor believes is the best starting point.
Why Insurers Use It
The primary motivation is cost. When more patients use lower-cost alternatives, insurers see large savings in drug expenditure. Step therapy also gives insurers leverage to negotiate lower prices from drug manufacturers, since they can limit access to expensive medications unless the manufacturer offers better terms.
Insurers also frame step therapy as a clinical tool. The argument is that starting with well-established, cost-effective treatments and escalating only when necessary promotes appropriate prescribing and prevents unnecessary use of expensive drugs. In some cases, patients do respond well to the first-line option and never need the costlier alternative, which genuinely saves money without compromising care. But the tension arises when the cheaper drug is unlikely to work for a specific patient and both the doctor and patient already know it.
How Common Step Therapy Has Become
Step therapy is growing. One analysis of commercial health plan coverage for pulmonary arterial hypertension drugs found that the proportion of policies requiring step therapy climbed from about 29% in 2017 to nearly 46% in 2022. Over that same period, the share of policies with at least one coverage restriction of any kind rose from 38% to 73%. While those numbers come from one disease area, they reflect a broader trend: insurers are applying step therapy to more drug classes and more conditions than they did even five years ago.
Conditions Most Affected
Step therapy is especially common for conditions treated with expensive biologic or specialty medications. Rheumatoid arthritis, psoriatic arthritis, psoriasis, atopic dermatitis, and other autoimmune or inflammatory diseases are frequently subject to these protocols. Cancer treatments, pulmonary conditions, and mental health medications also face step therapy requirements.
In psoriatic disease, the disconnect between medical guidelines and insurance requirements is stark. An analysis of 194 step therapy protocols for psoriasis found that none were consistent with current clinical treatment guidelines. Nearly all (99.4%) were more restrictive than what medical organizations recommend. For psoriatic arthritis, 68% of step therapy plans were more stringent than guidelines from professional rheumatology and dermatology organizations, which recommend biologics as first-line treatment. Instead, step therapy forces patients through topical treatments, oral medications, and phototherapy first.
Impact on Patients
The evidence on patient outcomes is concerning. A study of patients with rheumatoid arthritis and psoriatic arthritis found that those subjected to step therapy had 19% to 27% lower odds of achieving treatment effectiveness and 19% to 29% lower odds of sticking with their medication compared to patients without step therapy restrictions. Multiple studies show that repeated rounds of step therapy lead to treatment ineffectiveness, inefficiency, and lower medication adherence.
The personal toll can be severe. One psoriasis patient described being stable on an injectable biologic, only to have a new insurer require trials of multiple alternative drugs before re-approving it. During the months spent cycling through less effective treatments, their symptoms flared so badly they rarely slept more than three hours a night due to pain, their academic performance suffered, and they lost the ability to socialize or function normally.
Switching insurers creates its own problem. Roughly 25% of patients who change insurance providers are required to repeat step therapy under their new carrier, even if they already completed the process and found an effective treatment under a previous plan. This can mean going back to medications that already failed, interrupting treatment that was working, and waiting months to get back on the right drug.
The administrative burden is also significant. Step therapy requires extensive documentation from both patients and providers to justify exceptions, leading to delays in care, increased stress, and higher administrative costs for everyone involved.
How to Request an Exception
You’re not necessarily stuck following every step. Most plans are required to offer a process for requesting a step therapy exception, and a growing number of states have laws spelling out when those exceptions must be granted. You typically need your prescribing doctor to submit a request along with supporting clinical documentation. The grounds for an exception generally fall into a few categories:
- Medical risk: The required drug is contraindicated or likely to cause a serious adverse reaction or harm.
- Expected ineffectiveness: Based on your clinical history, the required drug is unlikely to work for you.
- Previous trial: You’ve already tried and failed the required drug (or one with a similar mechanism) under a current or previous insurance plan, and it was discontinued due to lack of effectiveness or side effects.
- Stability on current treatment: You’re already stable on the prescribed medication and switching would disrupt effective care.
- Harm to overall health: The required drug would worsen a coexisting condition, interfere with your treatment plan, or reduce your ability to perform daily activities.
The key detail: if you tried and failed a drug under a previous insurer, that history should count. Many state laws explicitly require plans to accept documentation of prior trials, even from a different carrier. Keep records of every medication you’ve tried, how long you were on it, and why it was stopped.
State Laws and Federal Proposals
A growing number of states have passed laws regulating step therapy. California’s AB 347, effective since January 2022, requires health plans to grant step therapy exceptions promptly when the required drug is inconsistent with good medical practice. Arizona has similar legislation requiring a clear, easily accessible exception process. These state laws typically mandate that insurers respond to exception requests within 72 hours, or within 24 hours if the situation is urgent.
At the federal level, the Safe Step Act was introduced in the Senate in 2023. It would require group health plans to establish a clear exception process with defined timelines for responding to requests. As of the end of the 118th Congress, the bill had been referred to committee but had not advanced further. For now, protections vary significantly depending on which state you live in and what type of insurance you have.
What You Can Do
If you’re facing a step therapy requirement, start by asking your doctor whether they can submit an exception request based on your medical history. Gather documentation of any medications you’ve previously tried, including dates, dosages, and reasons for stopping. Check whether your state has a step therapy exception law, since these laws give you specific rights that your insurer must honor.
If an exception request is denied, you typically have the right to appeal. Your doctor’s involvement in the appeal matters: a detailed letter explaining why the required drug is inappropriate for your specific situation carries more weight than a generic request. Keep copies of all correspondence and note the dates of every submission, since state laws often require insurers to respond within set timeframes, and missed deadlines can work in your favor.