M0090 corresponds to which data element?

• A. Date Assessment Completed in OASIS
• B. Date of Referral in OASIS documentation
• C. Discharge/Transfer/Death Date in OASIS
• D. Start of Care Date in OASIS assessment

Answer: (A)

In OASIS, the date the assessment is completed is the precise timestamp captured as M0090. This date marks when the clinician finalizes the OASIS assessment, serving as the official completion date for that assessment and anchoring it in time for scheduling, reporting, and quality measures. It is distinct from when a patient was referred, when care ends (discharge/transfer/death), or when care actually begins (start of care). Therefore, the correct data element is the Date Assessment Completed in OASIS.