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Ambulatory Surgery - Diagnosis, Procedure, and External Cause Codes

Published by Department of Health Care Access and Information | State of California | Metadata Last Checked: November 28, 2025 | Last Modified: 2025-11-06T22:57:53.970589
This dataset contains statewide counts for every diagnosis, procedure, and external cause of injury/morbidity code reported on the ambulatory surgery data. Diagnosis codes are reported using ICD-9-CM or ICD-10-CM. Procedure codes are reported using CPT-4. External cause of injury/morbidity codes are reported using ICD-9-CM or ICD-10-CM. ICD-10 replaced ICD-9, effective October 1, 2015. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.

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Complete Metadata
@type dcat:Dataset
accessLevel public
contactPoint 
                                            {
  "fn": "Department of Health Care Access and Information, Healthcare Analytics Branch",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:dataandreports@hcai.ca.gov"
}
description This dataset contains statewide counts for every diagnosis, procedure, and external cause of injury/morbidity code reported on the ambulatory surgery data. Diagnosis codes are reported using ICD-9-CM or ICD-10-CM. Procedure codes are reported using CPT-4. External cause of injury/morbidity codes are reported using ICD-9-CM or ICD-10-CM. ICD-10 replaced ICD-9, effective October 1, 2015. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.
distribution 
                                            [
  {
    "@type": "dcat:Distribution",
    "title": "2016 Ambulatory Surgery - External Cause of Injury/Morbidity Code Frequency",
    "format": "XLSX",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=003d0506-6237-4d0e-95d4-cbda2fddd4d7&limit=0",
    "description": "This data table contains statewide counts for every external cause of injury/morbidity code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data.  A principal and up to four external cause of injury/morbidity codes may be reported on each ambulatory surgery record.  ICD-10 replaced ICD-9, effective October 1, 2015.  Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/b8bbfc86-4855-4f49-9d71-756d6e8941ed/download/2016extcausecodefrequenciesas.xlsx",
    "describedByType": "application/json"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2009 Ambulatory Surgery - Procedure Code Frequency",
    "format": "XLSX",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=0137ff6e-080c-4ffe-8a91-1a50fc28c896&limit=0",
    "description": "This data table contains statewide counts for every procedure code (CPT-4) reported on the ambulatory surgery data. A principal and up to 20 secondary procedure codes may be reported on each ambulatory surgery record. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/31be6edd-9d1e-4ab9-8c29-77b4a7aa9e00/download/2009_procedurecodefrequencies_as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2015 Ambulatory Surgery - Diagnosis Code Frequency",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=08379e9e-235d-4163-b0fc-c1fe43e5eaed&limit=0",
    "description": "This data table contains statewide counts for every diagnosis code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data.  A principal and up to 24 secondary diagnosis codes may be reported on each ambulatory surgery record.  ICD-10 replaced ICD-9, effective October 1, 2015.  Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/9c4fe89c-bc87-436e-a801-7f1754f4d5c1/download/2015-diagnosis-code-frequencies-as.xlsx",
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  {
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    "title": "2020 Ambulatory Surgery - Procedure Code Frequency",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=084415c0-7fe6-406b-8ee5-7581ebb5773b&limit=0",
    "description": "This data table contains statewide counts for every procedure code (CPT-4) reported on the ambulatory surgery data. A principal and up to 24 secondary procedure codes may be reported on each ambulatory surgery record. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/81707837-ebbf-4fea-bcc1-9c14783436d1/download/2020_procedurecodefrequencies_as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2015 Ambulatory Surgery - External Cause of Injury/Morbidity Code Frequency",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=091fdf91-e198-421e-a1cd-6cb47ec79ca0&limit=0",
    "description": "This data table contains statewide counts for every external cause of injury/morbidity code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data.  A principal and up to four external cause of injury/morbidity codes may be reported on each ambulatory surgery record.  ICD-10 replaced ICD-9, effective October 1, 2015.  Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/b107a1e4-193f-4197-9a08-2587a0e07e2a/download/2015-e-code-frequencies-as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2010 Ambulatory Surgery - External Cause of Injury/Morbidity Code Frequency",
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    "description": "This data table contains statewide counts for every external cause of injury/morbidity code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data. A principal and up to four external cause of injury/morbidity codes may be reported on each ambulatory surgery record. ICD-10 replaced ICD-9, effective October 1, 2015. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/6cf5cd36-b393-440a-a000-eb4f900ac1ee/download/2010_extcausecodefrequencies_as.xlsx",
    "describedByType": "application/json"
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  {
    "@type": "dcat:Distribution",
    "title": "2013 Ambulatory Surgery - External Cause of Injury/Morbidity Code Frequency",
    "format": "XLSX",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=0e3222ad-5b6a-4f31-8c8e-d33cb110a695&limit=0",
    "description": "This data table contains statewide counts for every external cause of injury/morbidity code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data.  A principal and up to four external cause of injury/morbidity codes may be reported on each ambulatory surgery record.  ICD-10 replaced ICD-9, effective October 1, 2015.  Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/2296c890-c7ed-41b4-b753-8d25ea136252/download/2013-e-code-frequencies-as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2007 Ambulatory Surgery - External Cause of Injury/Morbidity Code Frequency",
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    "description": "This data table contains statewide counts for every external cause of injury/morbidity code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data. A principal and up to four external cause of injury/morbidity codes may be reported on each ambulatory surgery record. ICD-10 replaced ICD-9, effective October 1, 2015. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/164cb941-8cf6-4859-8def-83473f100990/download/2007_extcausecodefrequencies_as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2022 Ambulatory Surgery - Diagnosis Code Frequency",
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    "description": "This data table contains statewide counts for every diagnosis code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data. A principal and up to 24 secondary diagnosis codes may be reported on each ambulatory surgery record. ICD-10 replaced ICD-9, effective October 1, 2015. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/679921ac-af6a-437f-9a00-9627380dbb2e/download/2022_diagnosiscodefrequencies_as.xlsx",
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  {
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    "title": "2016 Ambulatory Surgery - Diagnosis Code Frequency",
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    "description": "This data table contains statewide counts for every diagnosis code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data.  A principal and up to 24 secondary diagnosis codes may be reported on each ambulatory surgery record.  ICD-10 replaced ICD-9, effective October 1, 2015.  Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/ca84dce7-b635-45e0-823c-2b8938562546/download/2016diagnosiscodefrequenciesas.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2010 Ambulatory Surgery - Diagnosis Code Frequency",
    "format": "XLSX",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=19a67043-441e-420f-bd14-a82ba2ba770f&limit=0",
    "description": "This data table contains statewide counts for every diagnosis code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data. A principal and up to 24 secondary diagnosis codes may be reported on each ambulatory surgery record. ICD-10 replaced ICD-9, effective October 1, 2015. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/12f42bc1-f7fb-4134-b787-8103c5926f63/download/2010_diagnosiscodefrequencies_as.xlsx",
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  },
  {
    "@type": "dcat:Distribution",
    "title": "2019 Ambulatory Surgery - Procedure Code Frequency",
    "format": "XLSX",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=1aa131e6-caa6-4347-a2aa-b43eecab7376&limit=0",
    "description": "This data table contains statewide counts for every procedure code (CPT-4) reported on the ambulatory surgery data. A principal and up to 20 secondary procedure codes may be reported on each ambulatory surgery record. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/cef41fc2-a722-434b-ba85-ee6fb57ebea9/download/2019_procedurecodefrequencies_as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2005 Ambulatory Surgery - Diagnosis Code Frequency",
    "format": "XLSX",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=1bc5b2bc-cd57-4514-bc36-70fa04335f3d&limit=0",
    "description": "This data table contains statewide counts for every diagnosis code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data. A principal and up to 24 secondary diagnosis codes may be reported on each ambulatory surgery record. ICD-10 replaced ICD-9, effective October 1, 2015. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/aabe1576-9b0f-4555-acb0-844d6378e9cb/download/2005_diagnosiscodefrequencies_as.xlsx",
    "describedByType": "application/json"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2020 Ambulatory Surgery - External Cause of Injury/Morbidity Code Frequency",
    "format": "XLSX",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=2bd7e951-6502-4c8b-bdbd-fb5568ce817c&limit=0",
    "description": "This data table contains statewide counts for every external cause of injury/morbidity code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data. Up to 12 external cause of injury/morbidity codes may be reported on each ambulatory surgery record. ICD-10 replaced ICD-9, effective October 1, 2015. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/7e914076-865b-4835-acb9-e0d3a9690c91/download/2020_extcausecodefrequencies_as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2017 Ambulatory Surgery - Procedure Code Frequency",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=2d4fc51e-e5f1-4459-abee-4bbc5171c669&limit=0",
    "description": "This data table contains statewide counts for every procedure code (CPT-4) reported on the ambulatory surgery data. A principal and up to 20 secondary procedure codes may be reported on each ambulatory surgery record. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/21bc90e0-184d-42bb-81fb-a85fceb22884/download/2017procedurecodefrequenciesasrev.xlsx",
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  {
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    "title": "2023 Ambulatory Surgery – Diagnosis Code Frequency",
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    "@type": "dcat:Distribution",
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    "description": "This data table contains statewide counts for every diagnosis code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data. A principal and up to 24 secondary diagnosis codes may be reported on each ambulatory surgery record. ICD-10 replaced ICD-9, effective October 1, 2015. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/05e80524-6a5e-4cd8-a27e-4771f081dcc3/download/2006_diagnosiscodefrequencies_as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2018 Ambulatory Surgery - Diagnosis Code Frequency",
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    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/11da89d3-ba37-4b7b-b3b4-6a993ca28edb/download/2018_diagnosiscodefrequencies_as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2021 Ambulatory Surgery - Diagnosis Code Frequency",
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    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/9af34427-c55f-4059-b73e-96f890631571/download/2021_diagnosiscodefrequencies_as.xlsx",
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  {
    "@type": "dcat:Distribution",
    "title": "2012 Ambulatory Surgery - Procedure Code Frequency",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=3c4c98d8-107d-4cda-a54d-73602c01693d&limit=0",
    "description": "This data table contains statewide counts for every procedure code (CPT-4) reported on the ambulatory surgery data.  A principal and up to 20 secondary procedure codes may be reported on each ambulatory surgery record. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/3ccee86f-bd4d-4e9d-8dba-12aefeffc470/download/2012-procedure-code-frequencies-as.xlsx",
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  },
  {
    "@type": "dcat:Distribution",
    "title": "2005 Ambulatory Surgery - Procedure Code Frequency",
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    "description": "This data table contains statewide counts for every procedure code (CPT-4) reported on the ambulatory surgery data. A principal and up to 20 secondary procedure codes may be reported on each ambulatory surgery record. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/f0cab890-9481-4c1c-b301-b5a7282ec959/download/2005_procedurecodefrequencies_as.xlsx",
    "describedByType": "application/json"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2021 Ambulatory Surgery - Procedure Code Frequency",
    "format": "XLSX",
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    "description": "This data table contains statewide counts for every procedure code (CPT-4) reported on the ambulatory surgery data. A principal and up to 20 secondary procedure codes may be reported on each ambulatory surgery record. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
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    "description": "This data table contains statewide counts for every diagnosis code (ICD-9-CM or ICD-10-CM) reported on the ambulatory surgery data.  A principal and up to 24 secondary diagnosis codes may be reported on each ambulatory surgery record.  ICD-10 replaced ICD-9, effective October 1, 2015.  Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
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    "description": "This data table contains statewide counts for every procedure code (CPT-4) reported on the ambulatory surgery data.  A principal and up to 20 secondary procedure codes may be reported on each ambulatory surgery record. Note: Physician-owned ambulatory surgery clinics do not report their data to HCAI and, therefore, are not included in the statewide frequencies.",
    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/001896bf-ea7a-4243-8860-f0b46557a21b/download/2013-procedure-code-frequencies-as.xlsx",
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    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/43c18e73-5643-4ebc-997d-6109db187c0f/download/2006_procedurecodefrequencies_as.xlsx",
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    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/4f3d82d1-fac7-4598-9eaa-4e0396673059/download/2007_diagnosiscodefrequencies_as.xlsx",
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    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/181f8c4b-1fb4-43d6-8736-9b8d712e66f2/download/2011_extcausecodefrequencies_as.xlsx",
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    "downloadURL": "https://data.chhs.ca.gov/dataset/d84f8a92-24e2-401d-b789-6e208c264aea/resource/1e3f983c-82a5-421e-9d84-91fa8bc2220b/download/2018_extcausecodefrequencies_as.xlsx",
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]
identifier 5839cd37-2904-4f33-9309-fd88429a4013
issued 2018-03-15T20:01:23.208618
keyword 
                                            [
  "AS",
  "ASC",
  "CPT-4",
  "Current Procedural Terminology",
  "HCAI",
  "ICD-10",
  "ICD-9",
  "International Classification of Diseases",
  "ambulatory surgery",
  "department of health care access and information",
  "diagnosis code",
  "external cause",
  "frequencies",
  "hospital",
  "injury",
  "morbidity",
  "procedure code"
]
license http://www.opendefinition.org/licenses/cc-by
modified 2025-11-06T22:57:53.970589
publisher 
                                            {
  "name": "Department of Health Care Access and Information",
  "@type": "org:Organization"
}
theme 
                                            [
  "Health and Human Services"
]
title Ambulatory Surgery - Diagnosis, Procedure, and External Cause Codes

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