| AGEDAY - Age in days (when AGE is less than 1 year) |
| Documentation Sections: |
| General Notes |
| Uniform Values |
| State Specific Notes |
| General Notes |
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Age in days (AGEDAY) is reported for patients less than 1 year old. AGEDAY is calculated from date of birth (DOB) and the admission date (ADATE) with the following exceptions:
When processing the 1996 HCUP inpatient data, no adjustment was made for the leap year when age was calculated from date of birth and admission date. This caused infants admitted on the day before their first birthday to have AGE=1 and AGEDAY = missing (.), instead of AGE=0 and AGEDAY=364. |
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| Uniform Values | ||||||||||||||||
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| State Specific Notes |
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California Central Distributor only - because of confidentiality restrictions, age in days (AGEDAY) is suppressed on some records. Only the calculated age in days could be used to assign AGEDAY because California did not supply this information. Because California did not provide an admission date, the date of service was used to calculate age in days. Colorado Beginning in data year 2014, Colorado no longer supplies age in days. Age in days could not be calculated because the date of birth (DOB) provided by Colorado does not include the day of birth. Only birth month and year are provided. The day of birth was set to 15 for all records. District of Columbia Only the calculated age in days could be used to assign AGEDAY because the District of Columbia did not supply this information. Indiana Only the calculated age in days was used to assign AGEDAY. Kentucky Prior to 2008, only the calculated age in days could be used to assign AGEDAY because Kentucky did not supply this information. Beginning 2008, age in days was used to assign AGEDAY. Maryland Beginning in 2013, the supplied age in days is used when the data element cannot be calculated. Minnesota Only the calculated age in days could be used to assign AGEDAY because Minnesota did not supply this information. Nebraska Only the calculated age in days could be used to assign AGEDAY because Nebraska did not supply this information. New Jersey Beginning in 2009, New Jersey supplied age in months. In 2008, only the calculated age was used to assign AGEDAY because New Jersey did not supply age in days. Beginning in 2001, the reported Age in Days was used when AGEDAY could not be calculated. Prior to 2001, only the calculated age could be used to assign AGEDAY because New Jersey did not supply age in days. New York Beginning with the 2008 data, the HCUP data element AGEDAY is missing (.) for AIDS/HIV patients. New York identifies AIDS/HIV records by ICD-9-CM diagnosis code, DRG, or MS-DRG:
Please note that the admitting diagnosis is not retained in the HCUP databases prior to 2012. In the 1988-1997 HCUP New York databases, the data source provided admission year and month, but did not provide the day. A day of "01" was imputed for all records. The imputed date was not used to calculate other data elements or to perform edit checks. Beginning in 1998, the complete admission date was provided by the data source. New York Beginning in 2002, both ADATE and DDATE are loaded from the admission date because full admission dates are provided, but only the year and month is provided for the services/discharge date. In the 1988-1997 HCUP New York databases, AGEDAY could not be calculated because New York did not report full admission and birth dates. During HCUP processing, only the reported age in days could be used to assign AGEDAY. North Carolina Because North Carolina did not provide an admission date, the principal procedure date was used to calculate age in days. Utah Only the calculated age could be used to assign AGEDAY because Utah did not supply age in days. Vermont Only the calculated age in days could be used to assign AGEDAY because Vermont did not supply this information. |
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| Internet Citation: HCUP Central Distributor SASD Description of Data Elements - All States. Healthcare Cost and Utilization Project (HCUP). October 2024. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/vars/sasddistnote.jsp?var=ageday. |
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| Last modified 10/16/24 |
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