Steven B. Ernst, MD
Emergency Medicine Physician · Upland, CA
Steven B. Ernst, MD is an emergency medicine physician with a practice address in Upland, California, and NPI 1568485324, issued on Jul 25, 2006. Check the license (California G63787, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Steven B. Ernst
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- G63787 CA
Self-reported in NPPES; status is on the state search - Practice location
- 999 San Bernardino RD, Upland, CA 91786
- Phone
- (909) 985-2811
- Enumerated
- Jul 25, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (818) 587-2493
- Medicaid ID
- 00G637870 CA
- Medicare enrollment
- Enrolled (PECOS I20050525000539); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 1987
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 999 San Bernardino RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- James Akamine, M.D.Diagnostic Radiology Physician1497790125
- Ahmed Al-WaisiInternal Medicine Physician1871115709
- Donald Alpiner, DOSurgery Physician1811086952
- Alexander ArzooStudent in an Organized Health Care Education/Training Program1891635629
- Liezl Avila, D.O.Emergency Medicine Physician1487064515
Verify Steven B. Ernst in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G63787Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% fewer Medicare Part D claims than the average emergency medicine physician in 2024
191 Medicare Part D claims for 138 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 18 claims were for opioids.
Most prescribed
- Ondansetron Odt23 claims
- Cefdinir17 claims
- Potassium Chloride14 claims
- Amoxicillin-Clavulanate Potass13 claims
- Hydrocodone-Acetaminophen11 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.
Bills Medicare through one group practice
- Mountain View Emergency Physicians Medical Group IncUpland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Steven B. Ernst among 7,751 emergency medicine physician records in California
Steven B. Ernst, 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
- Graduated1987 · median 2011 among the 4,560 with a school on file
- Record last updated2007 · 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 Upland → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Allan Bock, MDUpland, CA 917861366462830
- Anthony Cabrera, DOUpland, CA 917861114161007
- Heather Crane, MDUpland, CA 917861205859063
- James Fisgus, MDUpland, CA 917861902829765
- Scott Miller, M.D.Upland, CA 917861851367734
- Dalia Nassman, D.O.Upland, CA 917861639410921
- Kevin Parkes, MDUpland, CA 917861013938711
- Larry Potts, MDUpland, CA 917861679596191
Common questions
What is Steven B. Ernst, MD's NPI number?
Steven B. Ernst, MD's National Provider Identifier (NPI) is 1568485324, issued on Jul 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Steven B. Ernst, MD located?
The NPPES record lists a practice address at 999 San Bernardino RD, Upland, CA, 91786. Phone: (909) 985-2811. Providers update this record themselves, so call before visiting.
How can I verify Steven B. Ernst, MD's license?
NPPES lists California license number G63787, 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 Steven B. Ernst, MD prescribe under Medicare Part D?
In 2024, Steven B. Ernst, MD had 191 Medicare Part D claims for 138 beneficiaries; 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.