Pierre Assaf, MD
Emergency Medicine Physician · Fontana, CA
Pierre Assaf, MD is an emergency medicine physician with a practice address in Fontana, California, and NPI 1417969973, issued on Aug 13, 2006. Check the license (California A36989, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Pierre Assaf
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A36989 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9961 Sierra Ave, Fontana, CA 92335
- Phone
- (909) 427-5524
- Enumerated
- Aug 13, 2006
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 9961 Sierra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Solomon Abila, MDFamily Medicine Physician1871652479
- Jenny Abouelsood, M.D.Family Medicine Physician1457638512
- Marla Abrolat, MDPediatrics Physician1164593133
- Eduardo Acosta, MDPediatrics Physician1497803324
- Michael Adair, MDFamily Medicine Physician1780732651
- Berneva Adams, MDObstetrics & Gynecology Physician1376602987
Verify Pierre Assaf in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A36989Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average emergency medicine physician in 2024
54 Medicare Part D claims for 26 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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.
Pierre Assaf among 7,751 emergency medicine physician records in California
Pierre Assaf, 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 fileNo · 59% of these records are
- Record last updated2021 · 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).
55 emergency medicine physician records list a practice address in Fontana
They are 55 of the 3,012 NPPES records with a practice address in Fontana, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Fontana → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Greg Capestany, MDFontana, CA 923351134277007
- Pushkar Chand, M.D.Fontana, CA 923351013074582
- Jonathan Chock, MDFontana, CA 923351770650624
- Karita Goulbourne, MDFontana, CA 923351619044500
- Charlene Jung, MDFontana, CA 923351346398146
- Shant Kalanjian, MDFontana, CA 923351942377841
- Ronald Lugo, MDFontana, CA 923351972670883
- Tao Nguyen, M.D.Fontana, CA 923351598722506
Common questions
What is Pierre Assaf, MD's NPI number?
Pierre Assaf, MD's National Provider Identifier (NPI) is 1417969973, issued on Aug 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Pierre Assaf, MD located?
The NPPES record lists a practice address at 9961 Sierra Ave, Fontana, CA, 92335. Phone: (909) 427-5524. Providers update this record themselves, so call before visiting.
How can I verify Pierre Assaf, MD's license?
NPPES lists California license number A36989, 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 Pierre Assaf, MD prescribe under Medicare Part D?
In 2024, Pierre Assaf, MD had 54 Medicare Part D claims for 26 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.