A notice was posted in the Federal Register on February 16 by the CMS. This stated that is comments about CMS-484 Attending Physicians’ Certification, Medical Necessity for Home Oxygen Therapy as well as supporting Regulations, MAC Durable Equipment Medicare Administrative Contractors, regional Carrier and Certificate of Medical Necessity and Supporting Documentation, Rate Increase Disclosure and Notices, as well as Record keeping Requirements all due by April 19, th.