EMS Data Dictionary

Single source of truth across all national EMS data standards

Total Elements

500

Total Code Values

2,765

Validation Rules

8,176

Sections

35

Reference Tools

Browse by Section

Data Sources

NEMSIS 3.5 Standard

Live

National EMS Information System data standard including all element definitions, code values, and validation rules.

State Validation Rules

51 States

State-specific Schematron validation rules parsed from official state NEMSIS implementation guides.