HL7 OID Specifications
Category: EyeMD EMR 2.0
SUMMARY
OIDs are structured as paths in a tree, where the left-most number represents the root, and the right-most number represents a leaf. HL7, in its role as an ISO Registration Authority, has established an OID registry and assigns OIDs within its branch to HL7 users and vendors upon request. These OIDs are used to uniquely identify healthcare applications and services, as well as various types of identifiers.
Healthcare registries and application vendors may request details about our OID structure. This article provides a specification of our OID structure. As this article is publicly accessible, a link to this document may be shared with third parties.
OID SPECIFICATIONS
| Root | Usage ID | Contract ID (Decimal) | Record ID |
| 2.16.840.1.113883.3.2873 | 00 | 000000000000 | 000000000000 |
Example: 2.16.840.1.113883.3.2873.1.698969123456.1
Root
Our root OID assigned by HL7.
Usage ID
| Usage ID | Description |
| 1 | Study Instance UID Root (Sourced from Orders) |
| 2 | Study Instance UID Root (Sourced from Patient Flow) |
| 3 | Study Instance UID Root (Sourced from Imaging Study) |
| 10 | Series Instance UID Root (Sourced from Image Record) |
| 11 | Patient ID |
| 12 | Visit ID |
| 13 | Visit Allergy ID |
| 14 | Visit Medication ID |
| 15 | Visit Medical HistoryID |
| 16 | Visit Surgical HistoryID |
| 17 | Visit Diagnosis ID |
| 18 | Lab Observation Request ID |
| 19 | Lab Observation Result ID |
| 20 | HL7 Control ID |
| 21 | Employee ID |
| 22 | Site ID |
| 23 | Referring Provider ID |
| 24 | Order ID |
| 25 | Immunization ID |
| 26 | Legacy Diagnostic Machine Pt ID Logic |
| 27 | PM Pt ID |
| 28 | Chart Number |
| 29 | HL7 PID-18 |
Contract ID
This is a decimal representation of the Customers Contract ID. The Contract ID identifies a unique customer database. The original Contract ID is typically the first 3 letters of a customer name, followed by randomly assigned contract number, typically 5-7 digits in length. Letters of the Contract ID are converted to ASCII Character Codes. Numeric digits are left intact.
EXAMPLE: EYE123456 = 698969227147
| E | Y | E | 123456 |
| 69 | 89 | 69 | 123456 |
Record ID
This is the original record ID for the object, assigned by the customer system.