haau3 FHIR Implementation Guide (HFIG)
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NamingSystem: HIOS issuer ID

Official URL: https://haau3.com/fhir/NamingSystem/hios-issuer-id Version: 1.0.0
Active as of 2026-10-11 Computable Name: HIOSIssuerId

A Marketplace issuer's five-digit ID in CMS's Health Insurance Oversight System (HIOS), as CMS's Plan Attributes public use file writes it (IssuerId, for example 19898). Carried on a plan's issuer Organization. haau3 publishes this until CMS or HL7 publishes an identifier system for it.

Summary

Defining URLhttps://haau3.com/fhir/NamingSystem/hios-issuer-id
Version1.0.0
NameHIOSIssuerId
Statusactive
Definition

A Marketplace issuer's five-digit ID in CMS's Health Insurance Oversight System (HIOS), as CMS's Plan Attributes public use file writes it (IssuerId, for example 19898). Carried on a plan's issuer Organization. haau3 publishes this until CMS or HL7 publishes an identifier system for it.

Publisherhaau3

Identifiers

TypeValuePreferred
URIhttps://haau3.com/fhir/NamingSystem/hios-issuer-idtrue