Clinical codes · LIVE

RxNorm ICD-10-CM LOINC lookup

Code lookup

Look up a current RxNorm, ICD-10-CM, or LOINC preferred term from an exact published code.

LIVE $0.005 USDC GET /api/codes/lookup

Markdown: /docs/code-lookup.md · Canonical: https://magentlab.com/docs/code-lookup

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Look up a current RxNorm, ICD-10-CM, or LOINC preferred term from an exact published code.

When to use

When an agent already has a code and must not invent the preferred term. found=false is a valid paid 200.

When not to use

ICD-10 means ICD-10-CM. Dotted or compact form is accepted (E11.9 or E119).
Not a billing submission. Production coverage is Current Prescribable + ICD-10-CM + LOINC, not complete UMLS.
Do not send names or MRNs.

Formula

Exact system+code lookup in the local catalog (ICD-10-CM dotted or compact). found=false is a valid paid 200.

Citation

Title: Current Prescribable RxNorm, CMS ICD-10-CM, and LOINC
Authors: NLM, CMS, Regenstrief Institute
Source: Local catalog. Production coverage is Current Prescribable RxNorm + ICD-10-CM + LOINC after gold gate.
DOI: none

Worked example

RxNorm 198440

Given: code=198440system=rxnorm

Look up system=rxnorm code=198440 in the local catalog.
Return the preferred term when found; found=false is a valid paid 200.

Also searched as

RxNorm code lookup
ICD-10-CM display
LOINC preferred term
198440 acetaminophen

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/codes/lookup?system=rxnorm&code=198440

Full URL: https://api.magentlab.com/api/codes/lookup?system=rxnorm&code=198440

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/codes/lookup?system=rxnorm&code=198440"

Parameters

Name	Type	Required	Description
`system`	string	required · rxnorm, icd10, loinc	rxnorm, icd10 (ICD-10-CM), or loinc.
`code`	string	required	Exact published identifier. ICD-10-CM accepts dotted or compact form (E11.9 or E119). Max 32 characters.

Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

POST /api/codes/lookup Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 PREVIEW

1 to 25 items. Each item uses the same keys as the GET query parameters.
POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request (fixture)

{
  "items": [
    {
      "code": "198440",
      "system": "rxnorm"
    },
    {
      "code": "198440",
      "system": "rxnorm"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/codes/lookup",
  "items": [
    {
      "code": "198440",
      "status": "current",
      "system": "rxnorm",
      "display": "acetaminophen 500 MG Oral Tablet",
      "tty": "SCD",
      "obsolete": false,
      "found": true,
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "catalog": {
        "coverage": "seed",
        "coverage_meaning": "Compiled seed catalog. Production coverage=full is gold-gated Current Prescribable RxNorm + ICD-10-CM + LOINC, not complete monthly RxNorm or UMLS.",
        "notes": "ICD-10 entries are ICD-10-CM (US claims), not WHO ICD-10. RxNorm codes are RxCUI. LOINC codes are official LOINC numerics. coverage=full never means complete UMLS.",
        "source": "magent curated seed",
        "stale": false,
        "systems": [
          "rxnorm",
          "icd10",
          "loinc"
        ],
        "verified_at": null,
        "version": "2026.08-wedge"
      },
      "billable": null,
      "synonyms": [
        "tylenol 500mg",
        "tylenol 500 mg",
        "acetaminophen 500mg",
        "acetaminophen 500 mg tablet",
        "paracetamol 500 mg"
      ]
    },
    {
      "code": "198440",
      "status": "current",
      "system": "rxnorm",
      "display": "acetaminophen 500 MG Oral Tablet",
      "tty": "SCD",
      "obsolete": false,
      "found": true,
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "catalog": {
        "coverage": "seed",
        "coverage_meaning": "Compiled seed catalog. Production coverage=full is gold-gated Current Prescribable RxNorm + ICD-10-CM + LOINC, not complete monthly RxNorm or UMLS.",
        "notes": "ICD-10 entries are ICD-10-CM (US claims), not WHO ICD-10. RxNorm codes are RxCUI. LOINC codes are official LOINC numerics. coverage=full never means complete UMLS.",
        "source": "magent curated seed",
        "stale": false,
        "systems": [
          "rxnorm",
          "icd10",
          "loinc"
        ],
        "verified_at": null,
        "version": "2026.08-wedge"
      },
      "billable": null,
      "synonyms": [
        "tylenol 500mg",
        "tylenol 500 mg",
        "acetaminophen 500mg",
        "acetaminophen 500 mg tablet",
        "paracetamol 500 mg"
      ]
    }
  ]
}

Response

Field	Type	Description
`found`	boolean	true when the code exists in the catalog
`system`	string	rxnorm, icd10, or loinc
`code`	string	Canonical catalog code when found
`display`	string	Preferred term, or null when not found
`tty`	string	Term type, or null when not found
`status`	string	current or equivalent catalog status
`billable`	boolean	ICD-10-CM billable flag; null otherwise
`obsolete`	boolean	true when the catalog marks the code obsolete
`synonyms`	array	Known synonyms; empty when not found
`catalog`	object	Seed vs ingested vs full coverage metadata
`disclaimer`	string	Not-a-device notice

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "code": "198440",
  "status": "current",
  "system": "rxnorm",
  "display": "acetaminophen 500 MG Oral Tablet",
  "tty": "SCD",
  "obsolete": false,
  "found": true,
  "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "catalog": {
    "coverage": "seed",
    "coverage_meaning": "Compiled seed catalog. Production coverage=full is gold-gated Current Prescribable RxNorm + ICD-10-CM + LOINC, not complete monthly RxNorm or UMLS.",
    "notes": "ICD-10 entries are ICD-10-CM (US claims), not WHO ICD-10. RxNorm codes are RxCUI. LOINC codes are official LOINC numerics. coverage=full never means complete UMLS.",
    "source": "magent curated seed",
    "stale": false,
    "systems": [
      "rxnorm",
      "icd10",
      "loinc"
    ],
    "verified_at": null,
    "version": "2026.08-wedge"
  },
  "billable": null,
  "synonyms": [
    "tylenol 500mg",
    "tylenol 500 mg",
    "acetaminophen 500mg",
    "acetaminophen 500 mg tablet",
    "paracetamol 500 mg"
  ]
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

HTTP	Code	When
400	`invalid_system`	system must be rxnorm, icd10, or loinc Returned before settlement; you are not charged.
400	`invalid_code`	code is required and must be 1-32 characters Returned before settlement; you are not charged.
400	`invalid_items`	POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
400	`invalid_item_count`	items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
400	`invalid_item`	each items entry must be a JSON object Returned before settlement; you are not charged.

Related tools

Code search — Rank a natural-language drug, diagnosis, or lab phrase to current RxNorm, ICD-10-CM, or LOINC codes from the local catalog.

Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /docs/mcp.

Guarantees

HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
Execution is timeout-bounded and concurrency-capped.
Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.