| Level | Code | Display | Definition | 
 | 1 | ENT | entity | Corresponds to the Entity class 
 | 
 | 2 | HCE | health chart entity | A health chart included to serve as a document receiving entity in the management of medical records. 
 | 
 | 2 | LIV | living subject | Anything that essentially has the property of life, independent of current state (a dead human corpse is still essentially a living subject). 
 | 
 | 3 | NLIV | non-person living subject | A subtype of living subject that includes all living things except the species Homo Sapiens. | 
 | 4 | ANM | animal | A living subject from the animal kingdom. 
 | 
 | 4 | MIC | microorganism | All single celled living organisms including protozoa, bacteria, yeast, viruses, etc. 
 | 
 | 4 | PLNT | plant | A living subject from the order of plants. 
 | 
 | 3 | PSN | person | A living subject of the species homo sapiens. 
 | 
 | 2 | MAT | material | Any thing that has extension in space and mass, may be of living or non-living origin. 
 | 
 | 3 | CHEM | chemical substance | A substance that is fully defined by an organic or inorganic chemical formula, includes mixtures of other chemical substances. Refine using, e.g., IUPAC codes. 
 | 
 | 3 | FOOD | food | Naturally occurring, processed or manufactured entities that are primarily used as food for humans and animals. 
 | 
 | 3 | MMAT | manufactured material | Corresponds to the ManufacturedMaterial class 
 | 
 | 4 | CONT | container | A container of other entities. 
 | 
 | 5 | HOLD | holder | A type of container that can hold other containers or other holders. 
 | 
 | 4 | DEV | device | A subtype of ManufacturedMaterial used in an activity, without being substantially changed through that activity.  The kind of device is identified by the code attribute inherited from Entity. Usage: This includes durable (reusable) medical equipment as well as disposable equipment.
 
 | 
 | 5 | CER | certificate representation | A physical artifact that stores information about the granting of authorization. 
 | 
 | 5 | MODDV | imaging modality | Class to contain unique attributes of diagnostic imaging equipment. 
 | 
 | 2 | ORG | organization | A social or legal structure formed by human beings. 
 | 
 | 3 | PUB | public institution | An agency of the people of a state often assuming some authority over a certain matter. Includes government, governmental agencies, associations. 
 | 
 | 3 | STATE | state | A politically organized body of people bonded by territory, culture, or ethnicity, having sovereignty (to a certain extent) granted by other states (enclosing or neighboring states). This includes countries (nations), provinces (e.g., one of the United States of America or a French departement), counties or municipalities. Refine using, e.g., ISO country codes, FIPS-PUB state codes, etc. 
 | 
 | 4 | NAT | Nation | A politically organized body of people bonded by territory and known as a nation. 
 | 
 | 2 | PLC | place | A physical place or site with its containing structure. May be natural or man-made. The geographic position of a place may or may not be constant. 
 | 
 | 3 | CITY | city or town | The territory of a city, town or other municipality. 
 | 
 | 3 | COUNTRY | country | The territory of a sovereign nation. 
 | 
 | 3 | COUNTY | county or parish | The territory of a county, parish or other division of a state or province. 
 | 
 | 3 | PROVINCE | state or province | The territory of a state, province, department or other division of a sovereign country. 
 | 
 | 2 | RGRP | group | A grouping of resources (personnel, material, or places) to be used for scheduling purposes.  May be a pool of like-type resources, a team, or combination of personnel, material and places. 
 |