Searched for FDA regulations and comes with stuff only a lawyer can understand
Anyway on-line DME seem to be in agreement of the following:
Items that DO NOT require a copy of prescription.
1- CPAP Masks without headgear: These include everything except the headgear straps (remember you can add the headgear to make a complete CPAP mask)
2- CPAP Mask Parts: Cushions, Headgear, Accessories
3- CPAP Machine Parts: CPAP Hose/Tubing, Filters, Water Chambers, Parts, etc.
4- Comfort Items: Tube covers, moisturizers, comfort pads, etc
Items that Do require a copy of prescription before your order can ship.
1- Sleep Therapy Devices: CPAP machines, BiPAP machines, Oxygen Concentrators, etc.
2- Humidifiers: Heated CPAP and BiPAP Humidifiers.
3- Complete Assembled CPAP Masks: All CPAP and BiPAP masks that are fully assembled and labeled RX required.