M0090, Completion Windows, and Transmission Deadlines

M0090 (Date Assessment Completed) is the date the assessing clinician completes the comprehensive assessment, including all OASIS data items applicable to the assessment timepoint. The date should reflect the actual date the assessment was finished, not the date data entry was completed in the EHR.

The comprehensive assessment must be completed within the following windows: SOC (RFA 01) — within 5 calendar days after the SOC date; ROC (RFA 03) — within 2 calendar days of the patient's return home or knowledge of the return; Recertification (RFA 04) — during the last 5 days of the current 60-day certification period; Transfer (RFA 06/07) — within 2 calendar days of learning of the transfer; Discharge (RFA 09) — within 2 calendar days of the discharge date; Death at Home (RFA 08) — within 2 calendar days of the date of death.

Each completed OASIS record must be transmitted to iQIES within 30 calendar days of the M0090 date. Records transmitted after the 30-day deadline are accepted but flagged as late submissions in CASPER reports and may affect HH-VBP performance measurement.

An OASIS record is considered locked once the agency confirms transmission and iQIES returns an accepted status. After lock, modifications require either a correction record (modifying specific fields while preserving the original) or an inactivation request (removing the original record from the database). The correction window is generally 30 days from the date of acceptance, though specific item-level rules apply.