OASIS · Section M
M0066 — Birth Date
Response options, how to score it, and the error that most often sends the record back. Cited to Ch. 1, Item M0066.
OASIS-E2 v1.00.0 · ingested 2026-04-26
How to score it
Record the patient's date of birth in MM/DD/YYYY format as documented in the medical record. iQIES validates this against the date on the Medicare/Medicaid eligibility file; mismatches cause submission warnings.
The common error
Entering today's date or the assessment date by mistake. M0066 is the patient's birth date — verify against the medical record before submission.
Source: OASIS-E2 Guidance Manual — Ch. 1, Item M0066. Verified 2026-04-26.
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