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Data Element Name:  Patient Birth Date File Location:  **Master, De-identified, De-Identified Abbreviated
SPARCS Data Element Number:  11
Record Positions:  66 - 73 Format-Length:  N - 8
Effective Date:  1/1/1994 Revision Date:  January 1997
Deniable Data Element:  This field is composed of both non-deniable and deniable components. **The 2-digit day is deniable and is ONLY present on the Master file. The 4-digit year and the 2-digit month are non-deniable and are present on all files. See Appendix Z for release restrictions.


The date of the patient's birth.

Codes and Values:
  1. YYYY MM DD = Year Month Day

  2. Must have been a valid date in accordance with the Date Edit Validation Table in Appendix A.
Edit Applications:
  1. The age, calculated as the difference between the Patient Birth Date and the Admission Date/Start of Care (Data Element 5), must have been less than 125.

  2. Cannot have been after Admission Date/Start of Care (Data Element 5).

Conversion Notes:

Master File
  1. For discharge years prior to 1987, the 6 digit date of birth on the UBF and the age on the DDA was used to determine the century value. If the age was greater than 70 and the birth year was greater than 40, the century value assigned was '18'; otherwise it was '19'.

  2. As of 1987, date of birth, including century was reported on the DDA. However, no cross edit with age was done until a few years later. A consistency check was done among the UBF date of birth, DDA date of birth, and DDA age. If the DDA date of birth century was inconsistent with the other two fields it was changed.

Incomplete File (1982-1993)
  1. For matched DDA and UBF, the Master File conversions described on the preceding page were followed.

  2. For unmatched DDA's with complete date of birth, the date was used.

  3. For unmatched DDA's without a complete date of birth, the DDA birth year is calculated based on the discharge year and DDA age. The birth month and day are given '0101'.

  4. For unmatched UBF's, the UBF date of birth was used, prefixed with a century of 19.