NACHTYPE is assigned based on information provided by National Association of Children's Hospitals and Related Institutions (NACHRI). There are some hospitals that were not included in the information from NACHRI that are identified by the AHA Annual Survey of Hospitals as children’s hospitals. These hospitals will have NACHTYPE = 0 (indicating no information from NACHRI) but KID_STRATUM = 9999 (indicating a children's hospital).

There were five instances in which the NACHRI hospital type disagreed with the AHA Annual Survey of Hospitals. In these cases, we examined the data and consulted with AHRQ to determine whether or not to set KID_STRATUM to 9999. However, we did not change the NACHTYPE value.