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The Immunization Calculation Engine (ICE) Achieves Complete Validation in AIRA’s Measurement and Improvement Initiative

BY Erin Roche and Daryl Chertcoff ON July 29, 2026
Immunization Calculation Engine (ICE) | AIRA | CDC | CDS Insight | Clinical Decision Support (CDS) | EHR/PHR | Immunization Information System (IIS) | Open Source

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We are excited to announce that the Immunization Calculation Engine (ICE) open-source forecaster has achieved Complete Validation in the American Immunization Registry Association (AIRA) Measurement and Improvement Initiative. This designation recognizes ICE’s ability to provide accurate immunization evaluation and forecasting in alignment with national standards across all clinical decision support (CDS) measures tested. ICE is the first open-source, freely available immunization forecaster to earn this distinction.

CertificationThe Measurement and Improvement Initiative, developed by AIRA in partnership with the Centers for Disease Control and Prevention (CDC), provides independent testing of immunization information system (IIS) capabilities across several key functions, including clinical decision support. As part of this assessment, forecasters are evaluated across core CDS concepts and vaccine groups, including evaluation status, earliest recommended date, and recommended date. Achieving Complete Validation gives organizations confidence that ICE’s forecasting logic produces accurate immunization evaluations and forecasts.

This milestone reflects HLN Consulting’s ongoing commitment to open-source, standards-based solutions to improve the health and well-being of patients and populations. We remain dedicated to maintaining ICE’s clinical logic as immunization recommendations evolve, ensuring that ICE users across public health, health care, and other settings have access to accurate, transparent, and trusted immunization information.

Interested in learning more about ICE? Contact the ICE team at ice@hln.com. You can also see ICE in action using CDS Insight, a free tool that lets you simulate patient scenarios and receive instant immunization evaluations and recommendations powered by the ICE default immunization schedule rules. 

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