Code of Federal Regulations (CFR) Require a submission of an Outcome and Assessment Information Set (OASIS) assessment for all Home Health (HH) episodes of care is a condition of payment.

The Office of Inspector General (OIG) has recommended that Medicare strengthen its enforcement of OASIS as a condition of payment. In Medicare's response to OIG report OEI-01-10-00460, the Centers for Medicare & Medicaid Services (CMS) stated its intention to use the claims-OASIS interface to do this.  Medicare implemented the initial stage in April 2015. Medicare informed providers through the MLN Matters® Special Edition article SE1504. In that article, Medicare also notified HHAs that “CMS plans to use the claims matching process to enforce this condition of payment in the earliest available Medicare systems release. At that time, Medicare will deny claims when a corresponding assessment is past due in the QIES but is not found in that system.” CR9585 provides MACs with requirements to implement this next step.
 
When an OASIS Assessment Has Not Been Submitted As mentioned above, submission of an OASIS assessment is a condition of payment for HH episodes of care. OASIS reporting regulations require the OASIS to be transmitted within 30 days of completing the assessment of the beneficiary.

https://www.cms.gov/Outreach-and-Education/Medicare-Learning-Network-MLN/MLNMattersArticles/Downloads/SE17009.pdf