RxNorm ICD-10-CM LOINC search

Code search

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

LIVE $0.005 USDC GET /api/codes/search

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

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

What it computes

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

When to use

When an agent must not hallucinate or invent a billing or pharmacy code. Pay-per-request; empty matches is a valid paid 200.

When not to use

ICD-10 in this product means ICD-10-CM (US claims), not WHO ICD-10.
Production coverage is Current Prescribable RxNorm + ICD-10-CM + LOINC (gold-gated full). Not complete monthly RxNorm or UMLS.
Not a billing submission and not a medical device. Do not send names or MRNs.

Formula

Rank local catalog matches by token/prefix score; return current RxNorm, ICD-10-CM, or LOINC. Empty matches 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. Not complete UMLS.
DOI: none

Worked example

Tylenol 500mg → RxNorm

Given: query=Tylenol 500mgsystem=rxnorm

Normalize the query and rank local catalog rows by token/prefix score.
Best current RxNorm hit is code 198440.
Empty matches is a valid paid 200; magent does not invent a code.

Also searched as

RxNorm translation
ICD-10-CM lookup
LOINC code search
Tylenol 500mg RxNorm

Try

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

/api/codes/search?query=Tylenol%20500mg&system=rxnorm

Full URL: https://api.magentlab.com/api/codes/search?query=Tylenol%20500mg&system=rxnorm

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/search?query=Tylenol%20500mg&system=rxnorm"

Parameters

Name	Type	Required	Description
`query`	string	required	Natural-language drug, diagnosis, or lab description. Max 512 characters. Do not send patient names.
`system`	string	optional · rxnorm, icd10, loinc	Restrict to rxnorm, icd10 (ICD-10-CM), or loinc. Omit to search all.
`tty`	string	optional · SCD, SBD, IN, PIN, MIN, BN, GPCK, BPCK, DF, SCDC, SBDC, SCDF, SBDF, CM, LN	Restrict term type. Pharmacy orders typically want SCD. ICD-10-CM is CM; LOINC is LN.
`limit`	integer	optional · default 5	Number of ranked matches to return (1-25). Default 5.
`min_score`	integer	optional · default 35	Minimum rank score 0-100. Default 35.
`include_obsolete`	boolean	optional · default false	Include deprecated/obsolete codes. Default false.
`billable_only`	boolean	optional · default true	ICD-10-CM: return only HIPAA billable codes, not headers. Default true.

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/search 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": [
    {
      "query": "Tylenol 500mg",
      "system": "rxnorm"
    },
    {
      "query": "Tylenol 500mg",
      "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/search",
  "items": [
    {
      "system": "rxnorm",
      "matches": [
        {
          "code": "198440",
          "status": "current",
          "system": "rxnorm",
          "display": "acetaminophen 500 MG Oral Tablet",
          "tty": "SCD",
          "obsolete": false,
          "score": 95,
          "billable": null
        }
      ],
      "query": "Tylenol 500mg",
      "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"
      },
      "match_count": 1,
      "match_quality": "high"
    },
    {
      "system": "rxnorm",
      "matches": [
        {
          "code": "198440",
          "status": "current",
          "system": "rxnorm",
          "display": "acetaminophen 500 MG Oral Tablet",
          "tty": "SCD",
          "obsolete": false,
          "score": 95,
          "billable": null
        }
      ],
      "query": "Tylenol 500mg",
      "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"
      },
      "match_count": 1,
      "match_quality": "high"
    }
  ]
}

Response

Field	Type	Description
`query`	string	Echo of the submitted query
`system`	string	rxnorm, icd10, loinc, or all
`match_count`	integer	Number of ranked matches returned
`match_quality`	string	none, low, or high
`matches`	array	Ranked codes. First row is the best deterministic hit.
`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.

{
  "system": "rxnorm",
  "matches": [
    {
      "code": "198440",
      "status": "current",
      "system": "rxnorm",
      "display": "acetaminophen 500 MG Oral Tablet",
      "tty": "SCD",
      "obsolete": false,
      "score": 95,
      "billable": null
    }
  ],
  "query": "Tylenol 500mg",
  "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"
  },
  "match_count": 1,
  "match_quality": "high"
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_query`	query is required and must be 1-512 characters Returned before settlement; you are not charged.
400	`invalid_system`	system must be rxnorm, icd10, or loinc Returned before settlement; you are not charged.
400	`invalid_tty`	tty must be a known RxNorm, ICD-10-CM, or LOINC term type Returned before settlement; you are not charged.
400	`invalid_limit`	limit must be an integer from 1 to 25 Returned before settlement; you are not charged.
400	`invalid_min_score`	min_score must be an integer from 0 to 100 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 lookup — Look up a current RxNorm, ICD-10-CM, or LOINC preferred term from an exact published code.

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.