LIVE

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

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

x402 V2 curl

Expect HTTP 402 and a PAYMENT-REQUIRED header 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"

Cursor mcp.json

Intended config for @magent/mcp. This is not npm @x402/fetch (a payment fetch wrapper).

{
  "mcpServers": {
    "magent": {
      "args": [
        "-y",
        "@magent/mcp"
      ],
      "command": "npx",
      "env": {
        "X402_PRIVATE_KEY": "0xYOUR_SPENDING_KEY"
      }
    }
  }
}

Parameters

Bulk (POST)

POST the same path with a JSON items array. Price is n times the GET unit. Invalid items return HTTP 400 before settlement.

POST /api/codes/lookup Max 25 unit_amount * n PREVIEW

• 1 to 25 items. Each item uses the same keys as the GET query parameters.
• 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",
        "notes": "ICD-10 entries are ICD-10-CM (US claims), not WHO ICD-10. RxNorm codes are RxCUI. LOINC codes are official LOINC numerics.",
        "source": "magent curated seed",
        "systems": [
          "rxnorm",
          "icd10",
          "loinc"
        ],
        "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",
        "notes": "ICD-10 entries are ICD-10-CM (US claims), not WHO ICD-10. RxNorm codes are RxCUI. LOINC codes are official LOINC numerics.",
        "source": "magent curated seed",
        "systems": [
          "rxnorm",
          "icd10",
          "loinc"
        ],
        "version": "2026.08-wedge"
      },
      "billable": null,
      "synonyms": [
        "tylenol 500mg",
        "tylenol 500 mg",
        "acetaminophen 500mg",
        "acetaminophen 500 mg tablet",
        "paracetamol 500 mg"
      ]
    }
  ]
}

Response

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",
    "notes": "ICD-10 entries are ICD-10-CM (US claims), not WHO ICD-10. RxNorm codes are RxCUI. LOINC codes are official LOINC numerics.",
    "source": "magent curated seed",
    "systems": [
      "rxnorm",
      "icd10",
      "loinc"
    ],
    "version": "2026.08-wedge"
  },
  "billable": null,
  "synonyms": [
    "tylenol 500mg",
    "tylenol 500 mg",
    "acetaminophen 500mg",
    "acetaminophen 500 mg tablet",
    "paracetamol 500 mg"
  ]
}

Errors

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.

Also searched as

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

Payment

Required query parameters must be present and valid. 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. Retry the same URL with PAYMENT-SIGNATURE. Settlement completes before the tool runs. Full handshake and shared payment errors: Payments.

Guarantees

• Invalid query parameters return HTTP 400 before settlement. You are not charged.
• Settlement finishes before the tool executes. Uncertain settlement fails closed (HTTP 503).
• Execution is timeout-bounded and concurrency-capped.
• Calculator inputs are not persisted. Request logs store path without query.