Sean Grammy, D.O.
Emergency Medicine Physician · Antioch, CA
Sean Grammy, D.O. is an emergency medicine physician with a practice address in Antioch, California, and NPI 1982832127, issued on Jun 25, 2009. Check the license (California 20A13122, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sean Grammy
- Credential
- D.O.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 20A13122 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3901 Lone Tree Way, Antioch, CA 94509
- Phone
- (925) 779-7200
- Enumerated
- Jun 25, 2009
- Record last updated
- Jul 28, 2014 (not updated in 12 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 3901 Lone Tree Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Adedotun Adewusi, MDHospitalist Physician1679795280
- Danielle Aldrich, NPFamily Nurse Practitioner1467160192
- Katy Alexy, PA-CPhysician Assistant1629544556
- Nazish Ali, M.D.Internal Medicine Physician1932121498
- Maha Amr, M.DNeonatal-Perinatal Medicine Physician1962514141
- Donald Anderson, M.D.Anesthesiology Physician1295755825
Verify Sean Grammy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A13122Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% more Medicare Part D claims than the average emergency medicine physician in 2024
412 Medicare Part D claims for 263 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 35 claims were for opioids.
Most prescribed
- Cephalexin49 claims
- Ondansetron Odt36 claims
- Hydrocodone-Acetaminophen27 claims
- Prednisone20 claims
- Albuterol Sulfate Hfa19 claims
- Azithromycin18 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 94.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Sean Grammy among 7,751 emergency medicine physician records in California
Sean Grammy, D.O. 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 2009, is newer than 54% of them.
- NPI issued2009 · 54% of these records are older, 42% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2014 · 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).
25 emergency medicine physician records list a practice address in Antioch
They are 25 of the 2,184 NPPES records with a practice address in Antioch, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Antioch → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Ivan Cavaliere, MDAntioch, CA 945091174601231
- Patricio Chavez, M.DAntioch, CA 945091770502148
- Raj Dasari, MDAntioch, CA 945091053499145
- Mary Fitzsimons, M.DAntioch, CA 945091053330431
- Khanh Nguyen, M.D.Antioch, CA 945091033130711
- Duoc Nguyen, MDAntioch, CA 945091609954791
- Russell Rodriguez, M.DAntioch, CA 945091245259647
- Thomas Schutz, MDAntioch, CA 945091942229349
Common questions
What is Sean Grammy, D.O.'s NPI number?
Sean Grammy, D.O.'s National Provider Identifier (NPI) is 1982832127, issued on Jun 25, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Sean Grammy, D.O. located?
The NPPES record lists a practice address at 3901 Lone Tree Way, Antioch, CA, 94509. Phone: (925) 779-7200. Providers update this record themselves, so call before visiting.
How can I verify Sean Grammy, D.O.'s license?
NPPES lists California license number 20A13122, 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 Sean Grammy, D.O. prescribe under Medicare Part D?
In 2024, Sean Grammy, D.O. had 412 Medicare Part D claims for 263 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Sean Grammy, D.O.'s MIPS final score?
The 2023 MIPS final score is 94.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.