John Arthur Horning, MD
Emergency Medicine Physician · San Bruno, CA
John Arthur Horning, MD is an emergency medicine physician with a practice address in San Bruno, California, and NPI 1033148523, issued on Jun 30, 2006. Check the license (California G85580, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Arthur Horning
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- G85580 CA
33421 MT
Self-reported in NPPES; status is on the state search - Practice location
- 841 San Bruno Ave W Ste 100, San Bruno, CA 94066
- Phone
- (415) 300-4436
- Enumerated
- Jun 30, 2006
- Record last updated
- Jul 8, 2022
- Fax
- (415) 367-1514
- Medicaid ID
- 8256638 CA
- Medicare enrollment
- Enrolled (PECOS I20060203000181); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1993
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Verify John Arthur Horning in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G85580Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average emergency medicine physician in 2024
107 Medicare Part D claims, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate12 claims
- Buspirone Hcl12 claims
- Nebivolol Hcl12 claims
- Spironolactone12 claims
- Losartan Potassium11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
John Arthur Horning among 7,751 emergency medicine physician records in California
John Arthur Horning, MD is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1993 · median 2011 among the 4,560 with a school on file
- Record last updated2022 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in San Bruno → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Karen Feeney, M.DSan Bruno, CA 940661245267103
- Christian Molstrom, M.D.San Bruno, CA 940661912134552
- Carmie Chan, MDRedwood City, CA 940631962564526
- Dheeraj Duggineni, MDRedwood City, CA 940631174011647
- Renee Hsia, MDRedwood City, CA 940631871647362
- Stacey LakinRedwood City, CA 940631881199008
- Hiroya Nambu, MDRedwood City, CA 940631801214275
- Lauren Polen, MDRedwood City, CA 940631689990905
Common questions
What is John Arthur Horning, MD's NPI number?
John Arthur Horning, MD's National Provider Identifier (NPI) is 1033148523, issued on Jun 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Arthur Horning, MD located?
The NPPES record lists a practice address at 841 San Bruno Ave W Ste 100, San Bruno, CA, 94066. Phone: (415) 300-4436. Providers update this record themselves, so call before visiting.
How can I verify John Arthur Horning, MD's license?
NPPES lists California license number G85580, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Arthur Horning, MD prescribe under Medicare Part D?
In 2024, John Arthur Horning, MD had 107 Medicare Part D claims; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.