This case-sensitive code system http://terminology.hl7.org/CodeSystem/organization-alias-type defines the following codes:
| Code | Display | Definition |
| legalalternative | Legal Alternative | A pseudonym used by an organization to perform their business under a name that differs from the registered, legal name of the business, also known as a trade name, business name, or 'doing business as' (d.b.a.). |
| historical | Historical | Any previously used legal or trade names used by an organization since the creation of the business. Could include names used by independent organizations before a merger or other reorganization. |
| common | Common | Common name, i.e. SNAF, Rehab, etc. |