Is ICD-10-CM data free to use commercially?

Yes. ICD-10-CM and ICD-10-PCS are published by CMS and CDC NCHS as US government works in the public domain.

How do I know if an ICD-10-CM code is billable?

Every code has a billable flag. Header codes such as E11 are not billable; use one of their children, which the API returns from /children or /hierarchy.

How current is the data?

We load each CMS release when it is published. Each response includes data_version, and /v1/status shows when every dataset was last updated.

Can I look up a code that has been deleted?

Yes. Retired codes keep resolving with status, effective_end and, where CMS names one, replaced_by.

ICD-10 API

Look up and search every ICD-10-CM diagnosis and ICD-10-PCS procedure code over a REST API or MCP. Billable flags, hierarchy, retired codes and as-of dates, updated from CMS every release.

Source: CMS and CDC NCHS
Updated: Yearly (October 1), plus April updates
License: Public domain
Live version: fy2027, fy2027

Request

GET /v1/codes/icd10cm/E11.9

200 OK · application/json

{
  "data": {
    "system": "icd10cm",
    "code": "E11.9",
    "display": "Type 2 diabetes mellitus without complications",
    "billable": true,
    "parent": "E11",
    "status": "active",
    "effective_start": "2015-10-01",
    "effective_end": null
  },
  "meta": {
    "source": "cms-icd10",
    "data_version": "2026.1",
    "license": "Public domain (CMS)"
  }
}

Free lookup

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curl "https://api.healthcare.dev/v1/codes/icd10cm?q=E11.9" \
  -H "Authorization: Bearer $HDEV_API_KEY"

About the data

ICD-10-CM and ICD-10-PCS

ICD-10-CM is the code set US providers use for diagnoses on every claim; ICD-10-PCS covers inpatient procedures. CMS publishes a new release each October 1 and, some years, an April update. Each release adds, revises and retires codes.

healthcare.dev loads every release, checks it against quality gates, and serves it with the release version on every response. Retired codes stay queryable with their effective dates, and as_of returns a code exactly as it was on a past date, so claims from earlier years validate against the codes that were in force.

Source: CMS and CDC NCHS. Full field reference in the docs.

Endpoint: /v1/codes/icd10cm/{code}
Source id: cms-icd10
Cadence: Yearly (October 1), plus April updates
License: Public domain

Questions

ICD-10 API FAQ

Is ICD-10-CM data free to use commercially?: Yes. ICD-10-CM and ICD-10-PCS are published by CMS and CDC NCHS as US government works in the public domain.
How do I know if an ICD-10-CM code is billable?: Every code has a billable flag. Header codes such as E11 are not billable; use one of their children, which the API returns from /children or /hierarchy.
How current is the data?: We load each CMS release when it is published. Each response includes data_version, and /v1/status shows when every dataset was last updated.
Can I look up a code that has been deleted?: Yes. Retired codes keep resolving with status, effective_end and, where CMS names one, replaced_by.