A diagnostic study (as far as Medicare billing is concerned) is good for a lifetime. If the patient was not Medicare when the study was recorded, they must have a face to face with their treating physician when they become Medicare FFS in order to get a replacement PAP or supplies.
From the Medicare LCD
BENEFICIARIES ENTERING MEDICARE:
For beneficiaries who received a PAP device prior to enrollment in fee for service (FFS) Medicare and are seeking Medicare coverage of either rental of the device, a replacement PAP device and/or accessories, both of the following coverage requirements must be met:
- Sleep test – There must be documentation that the beneficiary had a sleep test, prior to FFS Medicare enrollment, that meets the Medicare AHI/RDI coverage criteria in effect at the time that the beneficiary seeks Medicare coverage of a replacement PAP device and/or accessories; and,
- Clinical Evaluation – Following enrollment in FFS Medicare, the beneficiary must have a face-to-face evaluation by their treating physician who documents in the beneficiary’s medical record that:
- The beneficiary has a diagnosis of obstructive sleep apnea; and,
- The beneficiary continues to use the PAP device.
If either criteria 1 or 2 above are not met, the claim will be denied as not reasonable and necessary.
In these situations, there is no requirement for a clinical re-evaluation or for objective documentation of adherence to use of the device.