Diane Z. Deferrante, MD
Geriatric Medicine (Family Medicine) Physician · Baldwin Park, CA
Diane Z. Deferrante, MD is a geriatric medicine (family medicine) physician with a practice address in Baldwin Park, California, and NPI 1548337447, issued on Nov 29, 2006. Check the license (California A60946, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Diane Z. Deferrante
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Family Medicine) Physician 207QG0300X
- License number
- A60946 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1011 Baldwin Park Blvd, Baldwin Park, CA 91706
- Phone
- (626) 851-1011
- Enumerated
- Nov 29, 2006
- Record last updated
- Sep 23, 2008 (not updated in 18 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest geriatric medicine (family medicine) physician records → All 243 in California → Look up another NPI →
Also registered at 1011 Baldwin Park Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Julia Aburto-Erazo, NPNurse Practitioner1922175777
- Mauricio Acevedo, MDInternal Medicine Physician1659442614
- Helen Achio, PHARM.D.Pharmacist1225114614
- Olufemi Adenuga, M.D, MPHPulmonary Disease Physician1134389125
- Soma Agarwal, MDOphthalmology Physician1437220316
Verify Diane Z. Deferrante in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A60946Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average geriatric medicine (family medicine) physician in 2024
462 Medicare Part D claims for 134 beneficiaries, against an average of 5,222 among the 1,271 providers of this specialty who prescribed in Part D.
Most prescribed
- Levothyroxine Sodium39 claims
- Omeprazole24 claims
- Potassium Chloride16 claims
- Amlodipine Besylate15 claims
- Furosemide15 claims
- Metoprolol Succinate14 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.
Diane Z. Deferrante among 243 geriatric medicine (family medicine) physician records in California
Diane Z. Deferrante, MD is one of 243 geriatric medicine (family medicine) physician records with a practice address in California. 76% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 53% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 46% of these records are
- Record last updated2008 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Family Medicine) Physician providers in California
There are 243 geriatric medicine (family medicine) physician records in California.
All 243 in California → Every provider in Baldwin Park → Geriatric Medicine (Family Medicine) Physician nationwide →
The 8 geriatric medicine (family medicine) physician records with the nearest ZIP codes
- Nancy Gibbs, MDBaldwin Park, CA 917061669543559
- Mary Herman, MDBaldwin Park, CA 917061770654675
- Michael Mitchell, MDBaldwin Park, CA 917061366501967
- William Wake, MDBaldwin Park, CA 917061851468672
- Thomas Woodbury, D.O.Rancho Cucamonga, CA 917301609878115
- Jung Han, DOEl Monte, CA 917311992092357
- Katie SoeEl Monte, CA 917331881156925
- John Dimare, M.D.Glendora, CA 917411013246578
Common questions
What is Diane Z. Deferrante, MD's NPI number?
Diane Z. Deferrante, MD's National Provider Identifier (NPI) is 1548337447, issued on Nov 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Diane Z. Deferrante, MD located?
The NPPES record lists a practice address at 1011 Baldwin Park Blvd, Baldwin Park, CA, 91706. Phone: (626) 851-1011. Providers update this record themselves, so call before visiting.
How can I verify Diane Z. Deferrante, MD's license?
NPPES lists California license number A60946, 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 Diane Z. Deferrante, MD prescribe under Medicare Part D?
In 2024, Diane Z. Deferrante, MD had 462 Medicare Part D claims for 134 beneficiaries; the average among geriatric medicine (family medicine) physician prescribers was 5,222. 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.