---
title: "Expand Text"
method: POST
path: "/api/v1/expand"
tags: ["expand"]
---

# Expand Text

`POST /api/v1/expand`

## Request

- Base URL: `https://api.accurecord.io` (the document declares no server; this is the origin it was published from)
- URL: `https://api.accurecord.io/api/v1/expand`
- Auth: none declared

Expand medical abbreviations in text.

Recognizes common medical abbreviations like:
- DM2 → diabetes mellitus type 2
- w/ → with
- CKD → chronic kidney disease
- HTN → hypertension
- CHF → congestive heart failure
- COPD → chronic obstructive pulmonary disease

Also provides hints for alphabetic index navigation (main_term_hint,
subterm_hints) which are useful for subsequent code lookups.

**Example:**
```json
{"text": "DM2 w/ CKD stage 3"}
```

**Response:**
```json
{
  "expanded_text": "diabetes mellitus type 2 with chronic kidney disease stage 3",
  "expansions": [
    {"original": "DM2", "expanded": "diabetes mellitus type 2", ...},
    {"original": "w/", "expanded": "with", ...},
    {"original": "CKD", "expanded": "chronic kidney disease", ...}
  ]
}
```

Free-tier keys are limited to 500 characters of input; Pro and Enterprise keys may
send the full 10,000. Over the limit returns 413. This endpoint normalizes shorthand
before an index lookup — it is not intended for whole clinical notes.

## Headers

- `x-api-key` string, nullable

## Request body

- ExpandRequest: Request body for abbreviation expansion.
  - `text` string, required: Text containing abbreviations to expand

## Response `200`

Successful Response

- object

## Other responses

- `400`: Malformed or out-of-bounds request — a batch over 50 codes, a file over the upload limit, an unparseable identifier, or a surface that is switched off in this environment (the `cpt_*_disabled` gates are 400, not 403). ⚠ Not interchangeable with 422: 400 is raised BY the handler, 422 by request validation.
- `401`: Missing, malformed, revoked or expired credential. Send the key as `X-API-Key` or `Authorization: Bearer`. `detail` is a string, except the MFA challenge on `/auth/login`, which is `{code: 'mfa_required', message}`.
- `403`: Authenticated but not permitted: the tier does not include the feature, the role is insufficient, or the free tier is paused. Gate-specific bodies use the `{code, message}` shape (`tier_required`, `insufficient_role`). ⚠ The free-tier pause is the ONE error in the service that does not use `detail` at all — its body is `{error: 'free_tier_paused', message}` at the top level. ⚠ Preconditions the caller CAN satisfy (no org, no BAA, PHI mode off) are 412, not 403 — see below.
- `404`: Resource, code, or org-scoped record not found. Note that a record belonging to ANOTHER organization is also a 404, never a 403 — existence is not disclosed across tenants.
- `412`: A precondition on the calling principal is unmet and the caller can fix it: no organization linked to the key (`org_required`), no signed BAA (`baa_required`), PHI mode not activated (`phi_not_activated`), reviewer mode off (`review_mode_disabled`), or the session was never second-factored (`mfa_required`). All use the `{code, message}` shape.
- `422`: Request body or query failed validation. FastAPI's own failures are a LIST of `{loc, msg, type}`; semantic refusals raised by the service are an object (the risk-adjustment endpoints use `{status, ...}`).
- `429`: Rate limit, quota or concurrency cap exceeded. The tier limiter, the per-key chart-review job cap, the anonymous demo cap and the auth/signup limiters all land here; only the tier limiter sets the `X-RateLimit-*` headers.
- `500`: Unhandled server error. The body is `{detail: 'Internal server error', request_id: <id>}` and the same id is on the `X-Request-ID` response header.
- `503`: A dependency this request needed is unavailable — the database, an upstream model provider, or reference data that is present but not READY. Retry is reasonable, except for the risk-adjustment `blocked_pack_not_ready` refusals, which stay 503 until the coefficient pack is actually loaded.

---

[API](https://skmtc.dev/accurecord/apis/icd-10-coding-api.md) · [All operations](https://skmtc.dev/accurecord/apis/icd-10-coding-api/llms.txt) · [OpenAPI document](https://skmtc.dev/accurecord/apis/icd-10-coding-api/revisions/b1e12ce06ba5?raw)