{
  "resourceType": "NamingSystem",
  "id": "OnOhipBillingNumberNS",
  "name": "OnOhipBillingNumber",
  "status": "draft",
  "kind": "identifier",
  "date": "2026-08-22",
  "publisher": "WELLSTAR Technologies Corp.",
  "responsible": "Ontario Ministry of Health -- the assigning authority; this specification names only the URI",
  "jurisdiction": [
    {
      "coding": [
        {
          "code": "CA-ON",
          "system": "urn:iso:std:iso:3166:-2"
        }
      ]
    }
  ],
  "description": "Identifies an Ontario OHIP billing number: the provider number the Ontario Ministry of Health assigns to a practitioner who bills OHIP directly, and which Ontario claims are submitted under. Values are the Ministry's own numbers, typically six digits, and are assigned by the Ministry -- this specification neither mints nor validates them. A practitioner without one is normal and conformant: residents, allied-health staff and providers who bill only through a group have none, which is why the slice carrying it is optional. The URI declared here is this specification's own, is stable, and is pinned in stored Identifier.system values. TWO SYSTEMS ARE IN PLAY FOR THIS AUTHORITY AND A READER MUST RESOLVE BOTH. Canada Health Infoway publishes a national naming system for the same number, https://fhir.infoway-inforoute.ca/NamingSystem/ca-on-ohip-billing-id, and the Nexus EMR write path that syncs a provider's record stamps a practitioner's billing number under that URI, so a Practitioner read from Nexus EMR may carry either -- or, on a provider whose record has been through both paths, both. Resolve the URI declared here first and Infoway's second, take the first value found, and treat what you find as one number held under two authorities rather than as two identifiers. Neither URI is derived from the other and no suffix or substring rule relates them, so match both literally. When authoring against this specification, write the URI declared here.",
  "uniqueId": [
    {
      "type": "uri",
      "value": "https://fhir.apps.health/NamingSystem/on-ohip-billing-number",
      "preferred": true,
      "comment": "The address this specification declares and pins on the profile slice, and the one the reporting field dictionary and the synthetic corpus carry. Author against this one."
    },
    {
      "type": "uri",
      "value": "https://fhir.infoway-inforoute.ca/NamingSystem/ca-on-ohip-billing-id",
      "preferred": false,
      "comment": "Canada Health Infoway's national naming system for the same Ontario billing number, and NOT a pre-migration address: it is a live authority on a host that publishes it. The Nexus EMR write path that syncs a provider's record stamps the number under this URI, so a reader that resolves only the preferred URI misses those practitioners. Resolve the preferred URI first and this one second, and take the first value found; when authoring, write the preferred URI."
    }
  ]
}