PAP (positive airway pressure) therapy treatsobstructive sleep apneaby delivering pressurized air into the airways to keep it open during the night while sleeping. PAP can reduce or completely eliminate sleep apnea (learn more about how PAP therapy workshere).

There is significant evidence that treating sleep apnea with PAP therapy improves quality of life, reduces daytime sleepiness, reduces motor-vehicle accidents, improves hypertension and mayreduce death due to cardiovascular events.

The most common device is called CPAP; however, there is another device called bi-level PAP or BiPAP that can be more comfortable for some patients. Learn more about how that device works and what's required to get approval from your insurance company.

How is a treating PAP pressure determined?

The pressure that is needed to treat a patient's sleep apnea is usually determined during a titration sleep study, a type of polysomnography that is performed in a sleep center. The patient is hooked up to electrodes to measure her sleep and wears a PAP mask to sleep (learn more about thedifferent types of sleep studies here).

For most patients, a CPAP will be used. The "C" stands for continuous. A CPAP machine blows air at one continuous pressure.

Once asleep, the sleep technician will monitor her sleep, track her apneas and adjust the pressure that is being delivered. Typically, as the pressure is increased, apneas will decrease. The goal of the titration study is to find the lowest pressure that will eliminate all or most of the breathing events. The technician may increase and later decrease the pressure. Once the data is scored and reviewed by a physician, a treating CPAP pressure can be determined.

Some patients with severe sleep apnea (learn more about the differences between mild, moderate and severe sleep apneahere) will need higher air pressure to keep the airway open. If the pressure gets very high the patient may be uncomfortable. In some cases, a two-level PAP device, called a bi-level or BiPAP device can be used.

How does bi-level PAP work?

Bi-level PAP delivers two different pressures of air: a higher pressure when the patient breathes in and a lower pressure when she breathes out. This lower pressure reduces the resistance and relieves the abdominal muscles, both of which can make the patient more comfortable.

The patient will also be titrated on this device to find the treating pressure that reduce or eliminate all events. The maximum inspiratory (breathing in) pressure on bi-level shouldn't exceed 30 cm H20 and difference between the inspiratory (breathing in) and expiratory (breathing out) pressures should not be less than 4 cm H20.

In general, a patient could be transitioned from CPAP to Bi-level when the CPAP pressure approaches 15 cm H2O. Exhaling against this CPAP pressure can be uncomfortable for most patients.

Aside from discomfort from PAP pressure, there is another subset of patients that may benefit from the use of bi-level therapy to time their breathing during night.

Why aren't all patients put on bi-level PAP?

Bi-level PAP is usually reserved for patients requiring higher pressures because CPAP is sufficient for most patients with lower pressure requirements.

Additionally, because the bi-level machine is more sophisiticated, it is more expensive than CPAP. In Southern California, Blue Cross reimburses around $475 for CPAP and $1,100 for a bi-level PAP machine (learn more about how insurance companies pay for PAP therapyhere). Insurance companies require proof that the patient attempted CPAP therapy before they will cover the more expensive bi-level machine.

Even though bi-level is more comfortable for some patients, recent studies have not shown that it leads to better adherence to therapy over CPAP.

When will insurance cover bi-level PAP?

Insurance companies will usually cover bi-level PAP if the patient has a diagnosis of obstructive sleep apnea and has shown "intolerance" using CPAP therapy. The patient may have been previously dispensed a CPAP device or may have merely attempted CPAP therapy during an in-center titration and was uncomfortable due to increasing pressure approaching or exceeding 15 cm H2O.

Medicare has clearly defined coverage cirteria for sleep studies and PAP devices. More commercial and HMO insurance plans are following Medicare guidelines. We have outlined their guidelines for bi-level PAP below:

Medicare will cover a bi-level respiratory assist device without backup (this is what they call a bi-level or BiPAP) for patients with obstructive sleep apnea if the patient meets the criteria for PAP therapy:

• AHI 或 RDI > 每小时 15 次事件，且至少 30 次事件或
• AHI 或 RDI > 每小时 5 至 14 次事件，且至少记录 10 次事件，并有以下情况的记录：白天过度嗜睡、认知障碍、情绪障碍或失眠；或
• 高血压、缺血性心脏病或中风史

and:

1. CPAP is tried and proven ineffective based on therapeutic trial conducted in either a facility (sleep center) or home setting.
1. 在为期 3 个月的试用期内，将进行一次面对面的临床复评。医生必须记录在停止使用 CPAP 治疗前，以下问题已得到解决：了解更多关于不同类型面罩及其贴合方式的信息 此处）。
1. CPAP压力设置过高导致患者无法耐受治疗，虽然尝试过较低的设置，但未能：控制OSA症状；或
1. 改善睡眠；或
1. 将 AHI/RDI 降低至可接受水平

如果患者在 3 个月的试用期内改用双水平呼吸机，只要剩余试用期至少还有 30 天，试用期长度就不会改变。如果剩余试用期不足 30 天，则必须在第 120 天之前进行重新评估（遵循与 CPAP 依从性相同的标准）。.

Read more about Medicare coverage for PAP and supplies here.

Do you have sleep apnea and need a PAP device? We are contracted with most payers in Southern California (see our full listhere).

预约CPAP治疗。.

资料来源：

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3119924/

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