Frederick Nathan Thomas, M.D.
General Practice Physician · Los Angeles, CA
Frederick Nathan Thomas, M.D. is a general practice physician with a practice address in Los Angeles, California, and NPI 1346280401, issued on Jun 7, 2006. Check the license (California G 40388, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Frederick Nathan Thomas
- Credential
- M.D.
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- G 40388 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2500 W Florence Ave, Los Angeles, CA 90043
- Phone
- (323) 778-6600
- Enumerated
- Jun 7, 2006
- Record last updated
- Jun 9, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (323) 778-6691
- Medicaid ID
- 00G40388 CA
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 1,956 in California → Look up another NPI →
Also registered at 2500 W Florence Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Frederick Nathan Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G 40388Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% more Medicare Part D claims than the average general practice physician in 2024
3,991 Medicare Part D claims for 173 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Atorvastatin Calcium339 claims
- Metformin Hcl206 claims
- Amlodipine Besylate168 claims
- Gabapentin164 claims
- Diclofenac Sodium155 claims
- Albuterol Sulfate Hfa147 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.
Industry payments in 2024: $94.96
4 payments; by number, the most common kind was food and beverage; the largest payer was Dexcom, Inc. The 4,259 providers of this specialty with any payment received $1,273.40 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Frederick Nathan Thomas among 1,956 general practice physician records in California
Frederick Nathan Thomas, M.D. is one of 1,956 general practice physician records with a practice address in California. 48% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 66% newer
- In a Medicare fileYes · 48% of these records are
- In the CMS Doctors and Clinicians fileNo · 27% of these records are
- Record last updated2011 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208D00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
General Practice Physician providers in California
There are 1,956 general practice physician records in California.
All 1,956 in California → Every provider in Los Angeles → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Raisa Heifets, MDLos Angeles, CA 900421033208269
- Lemmon McMillan, M.D.Los Angeles, CA 900441619196656
- Raisa Pichaj, MDLos Angeles, CA 900421669560660
- Ara Airapetian, MDLos Angeles, CA 900411578543443
- Samir Shahin, MDLos Angeles, CA 900451912010844
- Khek-Teck Tan, M.D.Los Angeles, CA 900451083753602
- Nigel Cairns, MDWest Hollywood, CA 900461902929300
- John Camesa, L.AC.West Hollywood, CA 900461073683736
Common questions
What is Frederick Nathan Thomas, M.D.'s NPI number?
Frederick Nathan Thomas, M.D.'s National Provider Identifier (NPI) is 1346280401, issued on Jun 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Frederick Nathan Thomas, M.D. located?
The NPPES record lists a practice address at 2500 W Florence Ave, Los Angeles, CA, 90043. Phone: (323) 778-6600. Providers update this record themselves, so call before visiting.
How can I verify Frederick Nathan Thomas, M.D.'s license?
NPPES lists California license number G 40388, 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 Frederick Nathan Thomas, M.D. prescribe under Medicare Part D?
In 2024, Frederick Nathan Thomas, M.D. had 3,991 Medicare Part D claims for 173 beneficiaries; the average among general practice physician prescribers was 3,030. 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.