NLM Clinical Tables

ICD-10-CM codes, diagnosis names and diagnosis code details

NLM Clinical Tables provides public clinical terminology tables, with diagnosis searches that may miss relevant codes and code explanations checked against current NLM and official classification sources.

Explain diagnosis code

Explain an ICD-10-CM diagnosis code with its official name, category, chapter, and whether it is billable. Codes are checked against the current NLM table and the corresponding official classification.

Your information

Code

ICD-10-CM diagnosis code as printed, with or without the dot (for example, E11.9 or E119).

1 credit per completed run

The same inputs also work from your code or an AI assistant. See For developers.

Example results

Type 2 diabetes mellitus without complications

CodeE11.9

Yes

Category: Type 2 diabetes mellitus
Category code: E11
Chapter: Endocrine, nutritional and metabolic diseases

View in NLM Clinical Tables

About the NLM Clinical Tables tool

NLM Clinical Tables finds ICD-10-CM codes and official names from a plain-language condition description, with an optional result maximum.

Explain diagnosis code returns an official name, category, chapter, and billable status for a supplied ICD-10-CM code, with or without a dot.

Built from clinicaltables.nlm.nih.gov. Last checked Oct 7, 2026.

Actions

Explain diagnosis code

1 credit

What you provide

Field	Type	Required	Description
Code`code`	Text	Required	ICD-10-CM diagnosis code as printed, with or without the dot (for example, E11.9 or E119).Example: E119

What you get

Field	Type	Description
Code`code`	Text	Diagnosis code with a dot after the first three characters.Example: E11.9
Chapter`chapter`	Text	ICD-10-CM chapter name in words.Example: Endocrine, nutritional and metabolic diseases
Billable`billable`	Yes or no	Whether the code is sufficiently specific to bill.Example: Yes
Page URL`page_url`	Text	Link to the code in the NLM Clinical Tables search.Example: https://clinicaltables.nlm.nih.gov/api/icd10cm/v3/search?terms=E11.9&sf=code
Category Code`category_code`	Text	Three-character ICD-10-CM category code.Example: E11
Category Name`category_name`	Text	Official three-character category name.Example: Type 2 diabetes mellitus
Official Name`official_name`	Text	Official diagnosis name.Example: Type 2 diabetes mellitus without complications

Example result

For Code: E119

JSON

{
  "code": "E11.9",
  "chapter": "Endocrine, nutritional and metabolic diseases",
  "billable": true,
  "page_url": "https://clinicaltables.nlm.nih.gov/api/icd10cm/v3/search?terms=E11.9&sf=code",
  "category_code": "E11",
  "category_name": "Type 2 diabetes mellitus",
  "official_name": "Type 2 diabetes mellitus without complications"
}

Search diagnosis codes

1 credit

Find ICD-10-CM diagnosis codes and official names from a plain-language condition description. Results follow the source search order; broad or unfamiliar wording may not match every relevant code.

What you provide

Field	Type	Required	Description
Description`description`	Text	Required	Condition in plain words, such as "type 2 diabetes with kidney problems".Example: Asthma
Max Results`max_results`	Number	Optional	Maximum number of matching codes to return, such as 10 (up to 50).Example: 3

What you get

Field	Type	Description
Diagnosis Codes`diagnosis_codes`	List	Matching ICD-10-CM diagnosis codes, best match first.
Code`diagnosis_codes[].code`	Text	ICD-10-CM diagnosis code used on forms.Example: J45.998
Page URL`diagnosis_codes[].page_url`	Text	NLM record lookup link for this code.Example: https://clinicaltables.nlm.nih.gov/api/icd10cm/v3/search?terms=J45.998&sf=code&…
Official Name`diagnosis_codes[].official_name`	Text	Official ICD-10-CM diagnosis name.Example: Other asthma

Example result

For Description: Asthma, Max Results: 3

JSON

{
  "diagnosis_codes": [
    {
      "code": "J45.998",
      "page_url": "https://clinicaltables.nlm.nih.gov/api/icd10cm/v3/search?terms=J45.998&sf=code&df=code%2Cname&count=1",
      "official_name": "Other asthma"
    },
    {
      "code": "J82.83",
      "page_url": "https://clinicaltables.nlm.nih.gov/api/icd10cm/v3/search?terms=J82.83&sf=code&df=code%2Cname&count=1",
      "official_name": "Eosinophilic asthma"
    },
    {
      "code": "J45.909",
      "page_url": "https://clinicaltables.nlm.nih.gov/api/icd10cm/v3/search?terms=J45.909&sf=code&df=code%2Cname&count=1",
      "official_name": "Unspecified asthma, uncomplicated"
    }
  ]
}

For developers

Call it from your code with one request. Change the values in input to run it on new data. To get an API key, open Developers at the bottom of Studio, turn on Developer mode and go to API keys.

cURL

curl 'https://api.fous.com/v1/query' \
  --fail-with-body --silent --show-error --max-time 180 \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H 'Content-Type: application/json' \
  --data-raw '{
  "api": "@nlm-clinical-tables",
  "visibility": "public",
  "operation": "explain_diagnosis_code",
  "version": 1,
  "input": {
    "code": "E119"
  },
  "response": {
    "format": "json"
  }
}'

What you can do with it

Find diagnosis codes from condition descriptions
Look up official names for diagnosis codes
Check a code’s category and chapter
Determine whether a diagnosis code is billable

Questions about NLM Clinical Tables

Can I run it with my own inputs?

Yes. Change the inputs in Studio and press Run, or send new inputs from your code, or ask a connected AI assistant.

Can I call this NLM Clinical Tables tool as an API?

Yes. Send a POST request to /v1/query with your Fous API key and the inputs, and get JSON back.

How much does it cost?

Each completed run costs 1 credit. Failed runs without a completed receipt are free; completed work can remain charged if delivery is interrupted. With pay as you go, a credit costs 1¢. Monthly plans cost less per credit.

Do I need a NLM Clinical Tables account?

No. You only need a Fous account.

How current is the data?

Fous gets the data from clinicaltables.nlm.nih.gov when you run it. Some results are reused for up to 24 hours, and results that use your account or key are never reused. It was last verified on Oct 7, 2026.