Getting a CPAP prescription requires a sleep apnea diagnosis, which means you’ll need a sleep test ordered by a doctor. The process typically involves three steps: seeing a physician, completing a sleep study, and receiving your prescription if the results show you need treatment. Most people can move through the entire process in a few weeks.
Why You Need a Prescription
CPAP machines are classified as medical devices and legally require a prescription to purchase in the United States. This applies whether you’re buying from a medical equipment supplier, an online retailer, or a pharmacy. The prescription specifies the type of device and the pressure settings tailored to your breathing pattern, so using one without proper calibration could be ineffective or uncomfortable.
Most CPAP prescriptions are written as “lifetime” prescriptions, meaning they don’t expire and remain valid as long as you continue therapy. Some providers set a specific duration, such as one year, so it’s worth confirming with your doctor or equipment supplier when you receive yours.
Step 1: See a Doctor
Your primary care physician can start the process. You don’t necessarily need a sleep specialist, though your doctor may refer you to one. Any licensed physician (or in many states, qualified nurse practitioners and physician assistants) can order a sleep study and write a CPAP prescription. If your symptoms are straightforward, such as loud snoring, witnessed breathing pauses, and daytime sleepiness, your primary care doctor can often handle the entire process without a referral.
If you have other medical conditions like heart disease, lung disease, or insomnia alongside your sleep complaints, your doctor will more likely refer you to a sleep medicine specialist or pulmonologist who can manage the overlapping issues.
Step 2: Complete a Sleep Study
A sleep study is required before any doctor can prescribe CPAP. There are two options: a home sleep apnea test or an in-lab sleep study (polysomnography). Your doctor will decide which is appropriate based on your health history.
Home Sleep Apnea Tests
Home tests are the simpler, more convenient option. Your doctor’s office or a sleep lab sends you a small device that monitors your breathing, oxygen levels, and heart rate while you sleep in your own bed. These tests accurately identify obstructive sleep apnea about 90% of the time and work best for people suspected of having moderate to severe sleep apnea with no other complicating medical conditions.
The main limitation is that home tests don’t measure brain waves, so they can’t track your actual sleep stages or determine exactly how long you were asleep. Instead of calculating breathing interruptions per hour of sleep, they estimate based on total recording time. If a home test comes back negative or inconclusive but your doctor still suspects sleep apnea, you’ll typically be sent for an in-lab study.
In-Lab Sleep Studies
An overnight study in a sleep clinic involves more sensors, including ones that track brain activity, eye movements, and muscle tone. This is the more comprehensive option and is the appropriate choice if you have cardiovascular disease, respiratory conditions, use opioid medications, or have a neuromuscular condition. It’s also used when your doctor suspects central sleep apnea (where the brain, not the airway, causes breathing to stop) since home tests can’t reliably detect that type.
You’ll spend one night at the clinic, typically arriving in the evening and leaving in the morning. Some labs perform a “split-night” study where they diagnose sleep apnea in the first half of the night and then fit you with a CPAP to calibrate your pressure settings in the second half.
Step 3: Get Your Diagnosis and Prescription
Your sleep study results are scored using a metric called the apnea-hypopnea index (AHI), which counts how many times per hour your breathing stops or becomes significantly shallow. The severity categories for adults are:
- Mild: 5 to fewer than 15 events per hour
- Moderate: 15 to fewer than 30 events per hour
- Severe: 30 or more events per hour
If your AHI is 5 or higher, you have a diagnosis of obstructive sleep apnea. Your doctor can then write a CPAP prescription. The prescription will specify whether you need a standard CPAP (which delivers one constant pressure) or a bilevel device (which delivers different pressures for breathing in and out), along with your recommended pressure range. It may also include accessories like a heated humidifier.
For mild cases, some doctors may discuss alternatives like positional therapy or an oral appliance before jumping to CPAP, depending on your symptoms and preferences. For moderate to severe cases, CPAP is the standard first-line treatment.
What Insurance Requires
If you’re using insurance, expect a few additional hoops. Medicare, for example, covers a 12-week trial of CPAP therapy after a diagnosis of obstructive sleep apnea. After that trial period, you’ll need to meet with your doctor in person so they can document in your records that the therapy is working and you’re using the machine consistently. If you meet those conditions, Medicare continues to cover the device as a rental for 13 months, after which you own it.
Private insurers generally follow a similar model. Most require a formal sleep study (home or in-lab), a confirmed AHI above their threshold, and sometimes prior authorization before approving the equipment. Many also require compliance data showing you’re using the machine a minimum number of hours per night, typically four hours, for continued coverage of supplies like masks and filters.
Your equipment supplier will need a written order from your doctor before delivering the machine. This order must be on file before any claim is submitted to insurance.
Getting a Prescription Without Insurance
If you’re uninsured or prefer to pay out of pocket, the process is the same medically: you still need a doctor’s evaluation and a sleep study. Some telehealth services now offer virtual consultations with sleep medicine providers who can order home sleep tests shipped to your door and write prescriptions based on the results. This can be faster and sometimes less expensive than the traditional route, though costs vary widely.
Home sleep tests purchased through these services typically range from $150 to $500. Once you have a valid prescription, you can purchase a CPAP machine from any authorized retailer. Machines bought without insurance generally cost between $500 and $1,500 depending on the model and features.
How Long the Process Takes
The timeline depends on your path. If your primary care doctor orders a home sleep test at your first visit, you could have results and a prescription within two to three weeks. If you need a referral to a sleep specialist, add the wait time for that appointment, which can range from a couple of weeks to a couple of months depending on your area. In-lab studies may have their own wait list.
Telehealth-based services tend to move faster since they’re designed to streamline the process, sometimes delivering a prescription within a week of your initial consultation if your home test confirms sleep apnea. Once you have the prescription in hand, most suppliers can have a machine to you within a few days.