Section 13 Appendix A - Acronyms and Abbreviations

Publication 5258 — Guide for Affordable Care Act (ACA) Information Returns (AIR) Submission Composition and Reference Guide · 2026-10-03 edition · updated 2026-10-04 · United States

Accepted Acronym/Abbreviation	Term Name
A2A	Application to Application
ACA	Affordable Care Act
ACK	Acknowledgment
AIR	ACA Information Returns
CR	Change Request
EIN	Employer Identifcation Number
ELC	Enterprise Life Cycle
IEP	Integrated Enterprise Portal
MTOM	Message Transmission Optimization Mechanism
SOAP	Simple Object Access Protocol
SOA	Services Oriented Architecture
TIN	Taxpayer Identifcation number
UI	User Interface
UTID	Unique Transmission Identifer
IRS	Internal Revenue Service
XML	Extensible Markup Language
SQL	Structured Query Language
MIME	Multipurpose Internet Mail Extensions

Guide for ACA Information Returns Submission Composition and Reference Guide 142

Appendix A - Acronyms and Abbreviations

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▸Contents — Publication 5258 — Guide for Affordable Care Act (ACA) Information Returns (AIR) Submission Composition and Reference Guide

Publication 5258 — Guide for Affordable Care Act (ACA) Information Returns (AIR) Submission Composition and Reference Guide

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