Medicare_Claims_Processing_Manual / Chapter_20 / 100.2.3

Why This Topic Matters

Oxygen claims are highly documentation-sensitive, and this section explains the Medicare framework used to support coverage decisions and claim review. Understanding the scope of the guidance helps billing and compliance staff identify when certifications, testing, and physician documentation must be present.

Article Sections

1. 100.2.3 - Evidence of Medical Necessity for Oxygen

   Introduces Medicare guidance for home oxygen coverage and the documentation used to support medical necessity review. It also outlines how suppliers and contractors handle certification-related information.

2. Blood Oxygen Testing

   Covers the testing framework used in home oxygen claims, including general timing requirements for initial, recertification, and revised certifications. It also describes how testing results are reviewed in relation to coverage determinations.

3. Physician Evaluation

   Describes physician involvement in initial certification and recertification processes. The section addresses evaluation timing as part of the supporting documentation for oxygen claims.

4. A - Initial Certifications

   Explains how contractors review initial oxygen claim documentation and related dates. It also summarizes the general group framework used for evaluating blood gas values and claim support.

5. B - Revised Certifications

   Addresses circumstances that trigger revised certification requirements and the related documentation review process. It also discusses how changes in the oxygen order are handled for claim payment purposes.