IIS Recommended Core Data Elements
Note: The IIS Core Data Elements have been updated as of 12/7/2012. The 2013-2018 Core Data Elements supersede the 2007 IIS Recommended Core Data Elements and accompany revised IIS Functional Standards for 2013-2018.
The original Immunization Information Systems (IIS) core data items were prepared in 1995 by CDC’s National Center for Immunization and Respiratory Diseases in consultation with the Immunization Grantee Working Group. It was reviewed by the National Vaccine Advisory Committee (NVAC), and recommendations of NVAC were incorporated. Contributions were also made by public health representatives and private providers. On February 5, 2007 NVAC approved a new set of core data items which were developed in consultation with CDC and the American Immunization Registry Association. The data items were published in the complete 2007 NVAC report [1.04 MB, 38 pages]
The Journal of Public Health Management and Practice published a summary of the complete report in the November/December 2007 edition.
Core Data Item Categories
The core data items fall into two categories: required and optional. These elements represent fundamental attributes necessary for identifying individuals and for describing immunization events.
- Required elements are critical for record exchange purposes, client deduplication, vaccine management, immunization status evaluation, reminder / recall and data analysis or use purposes.
- Optional core data elements are less important for record exchange. Some optional items (e.g., address) may be useful only at the local level.
The purpose of the core data element is to facilitate record exchange between IIS. It is imperative that, at a minimum, each IIS include in its database schema a method to receive and store all of the required core data elements, even if the IIS does not routinely collect the information. Thus, if an IIS receives a record from one system and subsequently transfers it to another, no required core data elements will be lost in the process. It is strongly recommended that IIS also collect data on all of the required core data elements for their own patients. Prospective implementation should begin on or before January 1, 2009 to enhance completeness and value of IIS data.
|Patient name: first, middle, last||Required|
|Patient alias name: first, middle, last||Optional|
|Patient address, phone number||Optional|
|Patient Social Security number (SSN)||Optional|
|Patient birth date||Required|
|Patient Primary language||Optional|
|**Patient birth order||Required|
|Patient birth registration number||Optional|
|Patient birth State/country||Required|
|Patient Medicaid number||Optional|
|Mother’s name: First, middle, last, maiden||Required|
|Father’s name: first, middle, last||Optional|
|Vaccine dose number||Optional|
|Vaccine expiration date||Optional|
|Vaccine injection site||Optional|
|Vaccine lot number||Required|
|**Historical vaccination flag indicator||Optional|
|**History of varicella disease indicator||Optional|
|**Patient status indicators that include active, inactive, MOGE, and other classifications||Optional|
** Changes with the 2007 report.
Other Notes and References:
- Patient alias name: first, middle, last (former names for management of adoptions and name changes)
- Patient address, phone number, birthing facility (these variables should be locally defined)
(Use HL7-defined Table 0292 – Vaccines Administered (code=CVX) found in Appendix 1. Note that up-to-date versions of this table will be maintained on the CDC Vaccines & Immunizations website.
(Use HL7-defined Table 0227 – Manufacturers of vaccines (code=MVX) found in Appendix 1. Note that up-to-date versions of this table will be maintained on the CDC Vaccines & Immunizations website.
Vaccine dose number
With a fully operating system, this variable is not needed. However, in the real world, and particularly during the initial startup phase, many systems will be gathering partial histories; therefore, to evaluate histories properly, dose number becomes very important.
References for Guidance
Each of the variables listed in the above table are described in detail in the following guides which offer specific guidance on implementation.
The current Health Level 7 Immunization Guide contains both messaging details and coding definitions.
- Page last reviewed: November 15, 2016
- Page last updated: February 16, 2018
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