Kenneth E. Grullon, MD
Obstetrics & Gynecology Physician · Antioch, CA
Kenneth E. Grullon, MD is an obstetrics & gynecology physician with a practice address in Antioch, California, and NPI 1801974977, issued on Nov 2, 2006. Check the license (California G76376, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kenneth E. Grullon
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G76376 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3400 Delta Fair Blvd, Antioch, CA 94509
- Phone
- (925) 779-5000
- Enumerated
- Nov 2, 2006
- Record last updated
- Dec 17, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G763760 CA
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 3400 Delta Fair Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sanaz Aboutalebi-Simon, O.D.Corneal and Contact Management Optometrist1033319215
- Denise Arvay, PT APhysical Therapy Assistant1861560872
- Richard Boise, MDPediatric Adolescent Medicine Physician1255483483
- Maria Borquez, MDPediatric Adolescent Medicine Physician1801974993
- Irina Bronstein, MDInternal Medicine Physician1972681039
- Seema Cameron, MDFamily Medicine Physician1134369465
Verify Kenneth E. Grullon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G76376Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
293 Medicare Part D claims for 90 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Trospium Chloride58 claims
- Nitrofurantoin Mono-Macro47 claims
- Yuvafem26 claims
- Trospium Chloride Er24 claims
- Methenamine Hippurate20 claims
- Estradiol17 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.
Kenneth E. Grullon among 5,088 obstetrics & gynecology physician records in California
Kenneth E. Grullon, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% 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, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2021 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Antioch → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Susie Ahn, MDAntioch, CA 945091265966113
- Ligia Giese, MDAntioch, CA 945091508944661
- Katrina Hendricks, MDAntioch, CA 945091699852525
- Young Kim, M.D.Antioch, CA 945091649236522
- Nina Lee, MDAntioch, CA 945091902984016
- Edgard Sanchez, MDAntioch, CA 945091962580068
- Vivien Tin, MDAntioch, CA 945091619041225
- Daniel Zimmerman, MDAntioch, CA 945091124121223
Common questions
What is Kenneth E. Grullon, MD's NPI number?
Kenneth E. Grullon, MD's National Provider Identifier (NPI) is 1801974977, issued on Nov 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kenneth E. Grullon, MD located?
The NPPES record lists a practice address at 3400 Delta Fair Blvd, Antioch, CA, 94509. Phone: (925) 779-5000. Providers update this record themselves, so call before visiting.
How can I verify Kenneth E. Grullon, MD's license?
NPPES lists California license number G76376, 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 Kenneth E. Grullon, MD prescribe under Medicare Part D?
In 2024, Kenneth E. Grullon, MD had 293 Medicare Part D claims for 90 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.