> For the complete documentation index, see [llms.txt](https://docs.b2ihealthcare.com/snow-owl/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.b2ihealthcare.com/snow-owl/9.x/quick-start/find-concepts-by-id-or-term.md).

# Find concepts by ID or term

## Search by identifier

Now that SNOMED CT content is present in the code system (identified by the unique id `SNOMEDCT`) it is time to take a deeper dive. A frequent interaction is to retrieve properties of a concept identified by its [SNOMED CT Identifier](https://confluence.ihtsdotools.org/display/DOCGLOSS/SNOMED+CT+identifier). To do so, execute the following command:

{% code fullWidth="false" %}

```bash
curl -u "test:test" 'http://localhost:8080/snowowl/snomedct/SNOMEDCT/concepts/138875005?expand=pt()&pretty'
```

{% endcode %}

The response should look something like this:

```json
{
  "id": "138875005",
  "released": true,
  "active": true,
  "effectiveTime": "20020131",
  "moduleId": "900000000000207008",
  "iconId": "snomed_rt_ctv3",
  "score": 0.0,
  "memberOf": [ "900000000000497000" ],
  "activeMemberOf": [ "900000000000497000" ],
  "definitionStatus": {
    "id": "900000000000074008"
  },
  "subclassDefinitionStatus": "NON_DISJOINT_SUBCLASSES",
  "pt": {
    "id": "220309016",
    "term": "SNOMED CT Concept",
    "concept": {
      "id": "138875005"
    },
    "type": {
      "id": "900000000000013009"
    },
    "typeId": "900000000000013009",
    "conceptId": "138875005",
    "acceptability": {
      "900000000000509007": "PREFERRED",
      "900000000000508004": "PREFERRED"
    }
  },
  "ancestorIds": [ ],
  "parentIds": [ "-1" ],
  "statedAncestorIds": [ ],
  "statedParentIds": [ "-1" ],
  "definitionStatusId": "900000000000074008"
}
```

We used the `expand` query parameter to include the concept's Preferred Term (PT) in the response. The concept in question is the root concept of the SNOMED CT hierarchy.

## Search by term

Snow Owl also allows users to retrieve concepts matching a specific search term or phrase. See what happens if we try to find the concepts associated with the condition "Méniere's disease":

```bash
curl -u "test:test" 'http://localhost:8080/snowowl/snomedct/SNOMEDCT/concepts?term=M%C3%A9niere%27s%20disease&expand=pt()&pretty'
```

This time more than one concept can be present in the response, so we receive a collection of items. Results are sorted by relevance, indicated by the field `score`:

```json5
{
  "items": [ {
    "id": "13445001",
    "released": true,
    "active": true,
    "effectiveTime": "20020131",
    "moduleId": "900000000000207008",
    "iconId": "disorder",
    "score": 3.9305625,
    "memberOf": [ "447562003", "733073007", "900000000000497000" ],
    "activeMemberOf": [ "447562003", "733073007", "900000000000497000" ],
    "definitionStatus": {
      "id": "900000000000074008"
    },
    "subclassDefinitionStatus": "NON_DISJOINT_SUBCLASSES",
    "pt": {
      "id": "178783019",
      "term" : "Ménière's disease",
      "concept": {
        "id": "13445001"
      },
      "type": {
        "id": "900000000000013009"
      },
      "typeId": "900000000000013009",
      "conceptId": "13445001",
      "acceptability": {
        "900000000000509007": "PREFERRED",
        "900000000000508004": "PREFERRED"
      }
    },
    "ancestorIds": [ "-1", "20425006", ..., "1279550006" ],
    "parentIds": [ "50438001" ],
    "statedAncestorIds": [ "-1", "64572001", "138875005", "404684003" ],
    "statedParentIds": [ "50438001" ],
    "definitionStatusId": "900000000000074008"
  }, {
    ...
  } ],
  "searchAfter": "AoIFQAd5LmITGo8wMTA4OTA5MTAwMDExOTEwNQ==",
  "limit": 50,
  "total": 27
}
```

The total number of matching concepts is shown in the property named `total`.


---

# Agent Instructions
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## Querying This Documentation
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Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.b2ihealthcare.com/snow-owl/9.x/quick-start/find-concepts-by-id-or-term.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
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