Jason Massa, D.O.
Neurology Physician · Walnut Creek, CA
Jason Massa, D.O. is a neurology physician with a practice address in Walnut Creek, California, and NPI 1841636156, issued on May 14, 2013. Check the license (California 20A13615, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jason Massa
- Credential
- D.O.
- Primary taxonomy
- Neurology Physician 2084N0400X
- License number
- 20A13615 CA
Self-reported in NPPES; status is on the state search - Practice location
- 675 Ygnacio Valley RD, Walnut Creek, CA 94596
- Phone
- (925) 938-5252
- Enumerated
- May 14, 2013
- Entity
- Type 1 · individual
Also registered at 675 Ygnacio Valley RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Thomas Callan, ODOptometrist1043348394
- Stephanie Chan, ODOptometrist1689635542
- Ming Fang, MDGastroenterology Physician1366520199
- Jonathan Geleris, D.D.S.General Practice Dentistry1043686850
- Nicholas Hyde, MDPhlebology Physician1255511788
- Maridez Jenkins, F.N.P.Family Nurse Practitioner1245570266
Verify Jason Massa in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A13615Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
31% fewer Medicare Part D claims than the average neurology physician in 2024
936 Medicare Part D claims for 134 beneficiaries, against an average of 1,356 among the 13,714 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Carbidopa-Levodopa301 claims
- Carbidopa-Levodopa Er107 claims
- Rytary85 claims
- Amantadine55 claims
- Donepezil Hcl53 claims
- Citalopram Hbr39 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 Medicare quality score for 2023: 100 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).
Industry payments in 2024: $631.34
24 payments, mostly food and beverage; the largest payer was Neurocrine Biosciences, Inc.. The 9,995 providers of this specialty with any payment received $8,603.82 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.
One hospital or facility affiliation
- East Bay Neurology IncSan Ramon, CA
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Neurology Physician providers in California
There are 2,160 neurology physician records in California.
Other neurology physician records in California
- Venkat Raghav Aachi, MDThousand Oaks, CA1740640051
- John Aalbers, M.D.San Diego, CA1942262431
- Puya Abbassi, D.O.San Jose, CA1831695428
- Ahmed Abdelhak, MB CHBSan Francisco, CA1053013748
- Hadi Abou El Hassan, MDLos Angeles, CA1053995720
- John Paul Aboubechara, MD, PHDPalo Alto, CA1205461803
- Justin Abraham, M.D., M.B.A.Santa Barbara, CA1225322522
- Scott Abramson, M.D.San Leandro, CA1891873667
- Valerie Acevedo, D.O.Newport Beach, CA1043258502
- Saviour Achilike, MDTracy, CA1033506688
Common questions
What is Jason Massa, D.O.'s NPI number?
Jason Massa, D.O.'s National Provider Identifier (NPI) is 1841636156, issued on May 14, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Jason Massa, D.O. located?
The NPPES record lists a practice address at 675 Ygnacio Valley RD, Walnut Creek, CA, 94596. Phone: (925) 938-5252. Providers update this record themselves, so call before visiting.
How can I verify Jason Massa, D.O.'s license?
NPPES lists California license number 20A13615, 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 Jason Massa, D.O. prescribe under Medicare Part D?
In 2024, Jason Massa, D.O. had 936 Medicare Part D claims for 134 beneficiaries; the average among neurology physician prescribers was 1,356. Part D covers Medicare prescriptions only.
What is Jason Massa, D.O.'s Medicare quality score?
The 2023 MIPS final score is 100 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), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.