---
title: "**Changes by Table**"
output: 
  html_document:
        toc: TRUE
        toc_float: TRUE
---

*from CDM v5.3 -> CDM v5.4*

For a full description of each table and field listed here, please see the [CDM specification](http://ohdsi.github.io/CommonDataModel/cdm54.html). 

Notation: 

- a **\+** indicates an addition to the model, either a table or field
- a **->** indicates an alteration either in naming or specification
- a **-** indicates a subtraction from the model, either a table or field

## PERSON
- No change

## OBSERVATION_PERIOD
- No change

## VISIT_OCCURRENCE
- Admitting_source_concept_id -> **Admitted_from_concept_id**
- Admitting_source_value -> **Admitted_from_source_value**
- Discharge_to_concept_id -> **Discharged_to_concept_id**
- Discharge_to_source_value -> **Discharged_to_source_value**

## VISIT_DETAIL
- Admitting_source_concept_id -> **Admitted_from_concept_id**
- Admitting_source_value -> **Admitted_from_source_value**
- Discharge_to_concept_id -> **Discharged_to_concept_id**
- Discharge_to_source_value -> **Discharged_to_source_value**
- Visit_detail_parent_id -> **Parent_visit_detail_id**

## CONDITION_OCCURRENCE
- No change

## DRUG_EXPOSURE
- No change

## PROCEDURE_OCCURRENCE
- \+ **Procedure_end_date**
- \+ **Procedure_end_datetime**

## DEVICE_EXPOSURE
- Unique_device_id -> **Changed to varchar(255)**
- \+ **Production_id**
- \+ **Unit_concept_id**
- \+ **Unit_source_value**
- \+ **Unit_source_concept_id**

## MEASUREMENT
- \+ **Unit_source_concept_id**
- \+ **Measurement_event_id**
- \+ **Meas_event_field_concept_id**

## OBSERVATION
- \+ **Value_source_value**
- \+ **Observation_event_id**
- \+ **Obs_event_field_concept_id**

## DEATH
- No change

## NOTE
- \+ **Note_event_id**
- \+ **Note_event_field_concept_id**

## NOTE_NLP
- No change

## SPECIMEN
- No change

## FACT_RELATIONSHIP
- No change

## LOCATION
- \+ **Country_concept_id**
- \+ **Country_source_value**
- \+ **Latitude**
- \+ **Longitude**

## CARE_SITE
- No change

## PAYER_PLAN_PERIOD
- No change

## COST
- No change
	
## DRUG_ERA
- No change

## DOSE_ERA
- No change

## CONDITION_ERA
- No change

## \+ **EPISODE**

|     EPISODE                      |
|----------------------------------|
|     episode_id                   |
|     person_id                    |
|     episode_concept_id           |
|     episode_start_date           |
|     episode_start_datetime       |
|     episode_end_date             |
|     episode_end_datetime         |
|     episode_parent_id            |
|     episode_number               |
|     episode_object_concept_id    |
|     episode_type_concept_id      |
|     episode_source_value         |
|     episode_source_concept_id    |

## \+ **EPISODE_EVENT**

|     EPISODE_EVENT                  |
|------------------------------------|
|     episode_id                     |
|     event_id                       |
|     episode_event_field_concept_id |

## METADATA
- \+ **Metadata_id**
- \+ **Value_as_number**

## CDM_SOURCE
- Cdm_source_name -> **Mandatory field**
- Cdm_source_abbreviation -> **Mandatory field**
- Cdm_holder -> **Mandatory field**
- Source_release_date -> **Mandatory field**
- Cdm_release_date -> **Mandatory field**
- \+ **Cdm_version_concept_id**

## CONCEPT
- No change

## VOCABULARY
- Vocabulary_reference -> **Non-mandatory field**
- Vocabulary_version -> **Non-mandatory field**

## DOMAIN
- No change

## CONCEPT_CLASS
- No change

## CONCEPT_RELATIONSHIP
- No change

## RELATIONSHIP
- No change

## CONCEPT_SYNONYM
- No change

## CONCEPT_ANCESTOR
- No change

## SOURCE_TO_CONCEPT_MAP
- No change

## DRUG_STRENGTH
- No change

## - **ATTRIBUTE_DEFINITION**

## \+ **COHORT**

|     COHORT                         |
|------------------------------------|
|     cohort_definition_id           |
|     subject_id                     |
|     cohort_start_date              |
|     cohort_end_date                |