ImmuNet - Maryland Immunization Information System

ImmuNet is Maryland's secure Immunization Information System (IIS) operated by the Center for Immunization at the Maryland Department of Health (MDH). The system ensures that vaccination data is only available to authorized healthcare providers​​, safeguarding patient privacy.

Maryland Law: Report Administered Vaccines to ImmuNet​

As per Maryland State Statute §18–109(d)(6)(iii), all vaccinations administered in Maryland must be reported to ImmuNet, regardless of patient opt-out status. CDC guidelines recommend submitting vaccination data within ​​one day of vaccine administration to support timely clinical decision-making. ​​

For a minimal list of required d​​ata elements to report, click here. For a complete list of reporting standards, refer to ​​​the ​ImmuNet specifications​ and the CDC-endorsed core data elements ​(historical data elements here).

Providers participating in vaccination programs (e.g. Vaccines for Children[VFC]) are required to report administered doses under their specific Organization ID to ensure proper vaccine allocation and inventory reconciliation. ​​

Are You Already Reporting to ImmuNet?

To confirm if your practice's vaccination records are being reported to ImmuNet:

Sign in to ImmuNet to check your patient data.

Don't have access? Request access.​​​ 

Providers Already Reporting to ImmuNet​

• Verify your data: Sign in to ImmuNet to ensure your data is being entered correctly. It is essential to periodically check for data accuracy.
• EHR/EMR users: Ensure your vendor updates to the EHR interface are in line with ImmuNet requirements to avoid submission issues.
• Need help with Organization ID? Contact ImmuNet Support.
• ​New location? If you have a new location to report from, fill out the ImmuNet Enrollment Form to obtain a new Organization ID.
  

Providers Not Reporting to ImmuNet

A. Providers With Electronic Health Records (EHR/EMR) Systems

B. Providers Without Electronic Health Records (EHR/EMR) Systems

​1. Update your interface: Contact your​ EHR/EMR vendor to adjust your system to match ImmuNet specifications​​.

2. Testing: Once your system is ready, submit a test file to ​ImmuNet Support​ for validation.

Note: ImmuNet follows CDC HL7 2.5.1 standards for immunization​​ messaging, including support for Query/Response and NDC codes.

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Already registered under CMS Promoting Interoperability (PI) programs?

If you are a CMS PI program participant, you may already be registered. For further assistance, contact the Public Health Reporting Team. 

​The Maryland Department of Health (MDH) strongly encourages reporting through EHR/EMR for accuracy, efficiency, and compliance with state law. If you do not have an EHR or EMR system, consider the following reporting options:

1. CSV File Uploads

• ​​Submit vaccination data via CSV files daily.
• Use the CRISP CSV-HL7 Conversion ​​​method to automate the process.
• Contact ImmuNet Support for assistance with testing and submission.
• After successful testing, you can upload via an SFTP client.

2. Manual Data Entry

• Least preferred: Enter patient data manually into ImmuNet daily.
• Review the ImmuNet Basic Guide for instructions.
• ​To access, you will need to have an Immu​​Net account. ​​

Additional Resources:

Infographic: EHR and IIS

Infographic: Bidirectional Data Exchange

List of EHRs Connected to ImmuNet​​