Medicare does not cover purchases of POCs or continuous oxygen machines. Medicare does cover rentals of both however so long as your doctor certifies the need for it (providing the level of need). For Medicare rentals once certified, there would be the usual Medicare deductible (it is under Part B for durable medical equipment). Medicare sets what the rental rate would be and that is what the provider is paid for the term. Under Medicare rules there is a 5 year period. The provider is paid for 3 of the years and the last 2 they must continue to service (or replace) under a no payment warranty. Inogen has historically been good on this as we did it directly with them. After the 5 year period you can get recertified for another 5 year period. Inogen now requires a contract and not all of their POCs are rented (despite what their online advertising implies). If you are certifed for 5L they will not rent such a machine either for continuous or the POC. The contract that Inogen requires you to sign does not state what equipment you will get, the term, or the rate, but has the patient sign it in advance assigning their Medicare benefits to them. Medicare (CMS) is of no help in this regard as they state they have no authority over provider contracts- which is nonsense to me. Effectively, Medicare has a rule (eg 5 year rule) which the provider contractually can ignore. Whether Inogen will follow through regardless of what its contracts states is another matter (they are under new management). Apparently CMS is considering getting rid of the certification process as it exists today and just have the doctor do so without any filings. Presently this is just a proposal. We have purchased continuous and 5 flow Inogen At Home machine from a third party provider as they were cheaper than Inogen. Due to chip shortages Inogen increased its pricing as of Sept 1 2021. I assume others may be doing the same. Respironics (which has had the CPAP problem) produced a 5 flow continuous machine (not POC) and it is OK (Everflo 5 flow).