John Masou Ellison, M.D.
Emergency Medicine Physician · Monterey, CA
John Masou Ellison, M.D. is an emergency medicine physician with a practice address in Monterey, California, and NPI 1093845943, issued on Mar 7, 2007. Check the license (California G79299, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Masou Ellison
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- G79299 CA
Self-reported in NPPES; status is on the state search - Practice location
- 23625 WR Holman Highway, Monterey, CA 93940
- Phone
- (831) 624-5311
- Enumerated
- Mar 7, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (831) 625-4948
- Medicare enrollment
- Enrolled (PECOS I20081013000323); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 1990
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 23625 WR Holman Highway
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ann Bispo, C.N.S., M.S.N., R.N.Psychiatric/Mental Health Clinical Nurse Specialist1073615381
- Alain Claudel, P.T.Physical Therapist1487700050
- Jack English, M.D.Anatomic Pathology & Clinical Pathology Physician1982772414
- William Fithian, M.D.Psychiatry Physician1316001159
Verify John Masou Ellison in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G79299Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% more Medicare Part D claims than the average emergency medicine physician in 2024
265 Medicare Part D claims for 152 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 44 claims were for opioids.
Most prescribed
- Ondansetron Odt34 claims
- Hydrocodone-Acetaminophen32 claims
- Naproxen29 claims
- Cephalexin11 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 MIPS final score for 2023 (Medicare payment program): 84.7 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
2 hospitals and group practices
- Community Hospital OF The Monterey PeninsulaMonterey, CA · Acute Care Hospitals4 of 5 stars
- Monterey Bay Observation MedicineMonterey, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
John Masou Ellison among 7,751 emergency medicine physician records in California
John Masou Ellison, M.D. 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
- Graduated1990 · median 2011 among the 4,560 with a school on file
- Record last updated2007 · 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 Monterey → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Andres Aldrete, M.D.Monterey, CA 939401679580831
- Sameer Bakhda, M.D.Monterey, CA 939401225228851
- Reb Julia Haas Close, M.D.Monterey, CA 939401043226830
- Jamie Dermon, M.D.Monterey, CA 939401609047729
- Paul File, M.D.Monterey, CA 939401720195266
- Eliud Garcia, MDMonterey, CA 939401174611180
- John Hage, M.D.Monterey, CA 939401548277999
- Andrew Kaminski, MDMonterey, CA 939401982607453
Common questions
What is John Masou Ellison, M.D.'s NPI number?
John Masou Ellison, M.D.'s National Provider Identifier (NPI) is 1093845943, issued on Mar 7, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Masou Ellison, M.D. located?
The NPPES record lists a practice address at 23625 WR Holman Highway, Monterey, CA, 93940. Phone: (831) 624-5311. Providers update this record themselves, so call before visiting.
How can I verify John Masou Ellison, M.D.'s license?
NPPES lists California license number G79299, 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 John Masou Ellison, M.D. prescribe under Medicare Part D?
In 2024, John Masou Ellison, M.D. had 265 Medicare Part D claims for 152 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is John Masou Ellison, M.D.'s MIPS final score?
The 2023 MIPS final score is 84.7 of 100. 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.