Michelle Tomassi, MD
Emergency Medicine Physician · Downey, CA
Michelle Tomassi, MD is an emergency medicine physician with a practice address in Downey, California, and NPI 1710166749, issued on Oct 26, 2007. Check the license (California C138956, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michelle Tomassi
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- C138956 CA
246488 NY
Self-reported in NPPES; status is on the state search - Practice location
- 9333 Imperial Hwy, Downey, CA 90242
- Phone
- (562) 657-7130
- Enumerated
- Oct 26, 2007
- Record last updated
- Nov 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160226000107); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 9333 Imperial Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Fariba Amini, RCPRegistered Respiratory Therapist1962984302
- Orland AndayaRegistered Respiratory Therapist1598247751
- Michelle Andersen, D.P.T.Physical Therapist1295165231
Verify Michelle Tomassi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C138956Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.4 times the Medicare Part D claims of the average emergency medicine physician in 2024
987 Medicare Part D claims for 612 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 70 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass95 claims
- Azithromycin77 claims
- Cefpodoxime Proxetil68 claims
- Prednisone63 claims
- Sulfamethoxazole-Trimethoprim63 claims
- Doxycycline Monohydrate61 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
- Southern California Permanente Medical GroupSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michelle Tomassi among 7,751 emergency medicine physician records in California
Michelle Tomassi, 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 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 50% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2002 · median 2011 among the 4,560 with a school on file
- 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).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Downey → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Amanda Barrett, M.D.Downey, CA 902421598936841
- Jennifer Blanco, M.D.Downey, CA 902421548520455
- Jennifer ElliceDowney, CA 902421275758237
- Peter Grimes, MDDowney, CA 902421518181866
- Joseph GrubicDowney, CA 902421033405030
- Satjiv Kohli, M.D.Downey, CA 902421316117583
- Daniel Morrad, DODowney, CA 902421477115228
- Denise Muschett, MDDowney, CA 902421295997781
Common questions
What is Michelle Tomassi, MD's NPI number?
Michelle Tomassi, MD's National Provider Identifier (NPI) is 1710166749, issued on Oct 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Michelle Tomassi, MD located?
The NPPES record lists a practice address at 9333 Imperial Hwy, Downey, CA, 90242. Phone: (562) 657-7130. Providers update this record themselves, so call before visiting.
How can I verify Michelle Tomassi, MD's license?
NPPES lists California license number C138956, 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 Michelle Tomassi, MD prescribe under Medicare Part D?
In 2024, Michelle Tomassi, MD had 987 Medicare Part D claims for 612 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.