# Records in a care category

URL: https://docs.healthcare.dev/reference/care-categories/records-in-a-care-category

```http
GET https://api.healthcare.dev/v1/care-categories/{slug}/codes
```

Codes (ICD-10-CM, ICD-10-PCS, HCPCS Level II) or drug products (NDC) in this category or any category below it, in code order, each with the category it was assigned (`category`), `confidence` and `derivation`. Retired records are left out unless `include_retired=true`. A cursor belongs to the category and system it came from. Answers `503` while the system's published version has no care categories yet.

Requires an API key: `Authorization: Bearer hdev_live_...`. See [Authentication](/authentication).

## Path parameters

| Name | Type | Required | Description | Example |
| --- | --- | --- | --- | --- |
| `slug` | string | yes | Category slug | `knee-replacement` |

## Query parameters

| Name | Type | Required | Description | Example |
| --- | --- | --- | --- | --- |
| `system` | "icd10cm" \| "icd10pcs" \| "hcpcs" \| "ndc" | yes | Which system's records | `icd10pcs` |
| `limit` | integer | no | Page size (max 100) | `25` |
| `cursor` | string | no | Opaque cursor from `links.next` |  |
| `include_retired` | "true" \| "false" | no | Also return retired records (default false) | `true` |
| `view` | "compact" \| "standard" \| "full" | no | How much of each record to return (default `full`). `compact`: `system`, `code`, `display`, `category` (fewest tokens, for agents). `standard`: every field. `full`: every field. | `compact` |
| `fields` | string | no | Comma-separated fields to return instead of a view. Valid fields: `system`, `code`, `display`, `status`, `category`, `confidence`, `derivation`, `href`. | `system,code,display` |

## Examples

**curl**

```sh
curl "https://api.healthcare.dev/v1/care-categories/knee-replacement/codes?system=icd10pcs&limit=25" \
  -H "Authorization: Bearer $HDEV_API_KEY"
```

**TypeScript**

```ts
const res = await fetch("https://api.healthcare.dev/v1/care-categories/knee-replacement/codes?system=icd10pcs&limit=25", {
  headers: { Authorization: `Bearer ${process.env.HDEV_API_KEY}` },
});
const { data, meta } = await res.json();
```

**Python**

```python
import os
import requests

res = requests.get("https://api.healthcare.dev/v1/care-categories/knee-replacement/codes?system=icd10pcs&limit=25", headers={"Authorization": f"Bearer {os.environ['HDEV_API_KEY']}"})
body = res.json()
```

## Response

Records, in code order

```json
{
  "data": [
    {
      "system": "icd10cm",
      "code": "string",
      "display": "string",
      "status": "string",
      "category": "string",
      "confidence": 0,
      "derivation": "source_stated",
      "href": "string"
    }
  ],
  "meta": {
    "source": "cms-icd10",
    "data_version": "2026.1",
    "retrieved_at": "2026-10-24T12:00:00Z",
    "license": "Public domain (CMS). Reference data, not medical advice."
  },
  "links": {
    "self": "/v1/care-categories/knee-replacement/codes?system=icd10pcs&limit=25",
    "next": "/v1/care-categories/knee-replacement/codes?system=icd10pcs&limit=25&cursor=eyJrIjoiRTExLjkifQ"
  }
}
```

### Fields

| Field | Type | Always present | Description |
| --- | --- | --- | --- |
| `system` | CareCategorySystem | yes |  |
| `code` | string | yes | The code, or the product NDC for `ndc` |
| `display` | string | yes | Short description, or the drug's name |
| `status` | string | yes | `active` or `retired` |
| `category` | string | yes | Slug of the category it is in (this one or one below it) |
| `confidence` | number | yes |  |
| `derivation` | Derivation | yes | `source_stated`: the source states it explicitly. `derived`: inferred from the source's text. `reviewed`: checked by a person against the source. |
| `href` | string | yes | Lookup path for the full record |

## Errors

Errors are `application/problem+json` ([RFC 9457](https://www.rfc-editor.org/rfc/rfc9457)). Branch on `type`, not on `title`. See [Errors](/errors).

| Status | `type` | When |
| --- | --- | --- |
| 400 | `invalid-request` | A parameter or the body failed validation; `errors` lists each field. |
| 401 | `unauthorized` | Missing, malformed or revoked API key. |
| 404 | `not-found` | No record with that id (retired records are still returned). |
| 429 | `rate-limited / quota-exceeded` | Too many requests per second (retry after `Retry-After`), or the monthly quota is used up. |
| 503 | `dataset-unavailable / unavailable` | The dataset has no published version yet, or the service is degraded. |