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Asthma Emergency Department Visit Rates

Published by California Department of Public Health | State of California | Catalog Last Checked: March 28, 2026 at 07:38 PM | Dataset Last Updated: December 09, 2025 at 06:44 PM
This dataset contains counts and rates (per 10,000 residents) of asthma emergency department (ED) visits among Californians. The table “Asthma Emergency Department Visit Rates by County” contains statewide and county-level data stratified by age group (all ages, 0-17, 18+, 0-4, 5-17, 18-64, 65+) and race/ethnicity (white, black, Hispanic, Asian/Pacific Islander, American Indian/Alaskan Native). The table “Asthma Emergency Department Visit Rates by ZIP Code” contains zip-code level data stratified by age group (all ages, 0-17, 18+). The data are derived from the Department of Health Care Access and Information emergency department database. These data include emergency department visits from all licensed hospitals in California. These data are based only on primary discharge diagnosis codes. On October 1, 2015, diagnostic coding for asthma transitioned from ICD9-CM (493) to ICD10-CM (J45). Because of this change, CDPH and CDC do not recommend comparing data from 2015 (or earlier) to 2016 (or later). NOTE: Rates are calculated from the total number of asthma emergency department visits (not the unique number of individuals).

Resources

5 resources available

  • Asthma ED Visit Rates by County 2015-Present

    CSV
  • Asthma ED Visit Rates by Zip Code and Age Groups 2013-present

    CSV
  • Asthma ED Visit Rates by ZIP Code 2013-Present

    CSV
  • Notes-Asthma ED Visit Rates by Zip Code

    PDF
  • All resource data

    ZIP

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