LOINC Code 21866-9: Patient ID.hospital
21866-9 is a LOINC code used to identify Patient ID.hospital in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Patient ID.hospital. It is commonly used with the system or sample type ^Patient.
What is this code?
LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Patient ID.hospital. It is commonly used with the system or sample type ^Patient.
When is it used?
- Used in lab systems, EHRs, and clinical data exchange.
- May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
- Status: ACTIVE
What it does not mean
- The code identifies the observation or test, not the actual result.
Key facts
- Patient ID.hospital
- Provides a unique identifier for the patient consisting of the year in which the patient was first seen at the reporting facility and the consecutive order in which the patient was abstracted. The first four numbers specify the year and the last five numbers are the numeric order in which the patient was entered into the registry database. Within a registry, all primaries for an individual must have the same accession number. The first four digits must be greater than or equal to 1944. This data item protects the identity of the patient and allows cases to be identified on a local, state, and national level. If the central registry preserves this number, they can refer to it when communicating with the hospital. It also provides a way to link computerized follow-up reports from hospitals into the central database... NAACCR Data Standards and Data Dictionary Version 11
- Hosp; Ident; Identifier; Intradermal; Nominal; Point in time; Random; TUMOR REGISTRY(NAACCR)
Where you may see this code
You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.
Common synonyms
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.