James Weldon Maas, M.D. PH.D.
Neurology Physician · San Francisco, CA
James Weldon Maas, M.D. PH.D. is a neurology physician with a practice address in San Francisco, California, and NPI 1255506788, issued on Apr 25, 2008. Check the license (California A102712, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Weldon Maas
- Credential
- M.D. PH.D.
- Primary taxonomy
- Neurology Physician 2084N0400X
- License number
- A102712 CA
Self-reported in NPPES; status is on the state search - Practice location
- 505 Parnassus Avenue, San Francisco, CA 94143
- Phone
- (415) 476-1489
- Enumerated
- Apr 25, 2008
- Record last updated
- Apr 25, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100719000325); accepts Medicare assignment
- Medical or professional school
- Washington University School Of Medicine, 2006
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest neurology physician records → All 2,339 in California → Look up another NPI →
Also registered at 505 Parnassus Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
- William Alegria, PHARMDPharmacist1942770565
- Hayley Barnes, MBBS, PHDPulmonary Disease Physician1851106223
- Benjamin Beland, MDStudent in an Organized Health Care Education/Training Program1598500761
- Vaibhav Birda, MDHospitalist Physician1346809506
- Galen Bussmann, MD, MBAEmergency Medicine Physician1306541578
- Hilary ChildersInternal Medicine Physician1861996001
Verify James Weldon Maas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A102712Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
29% fewer Medicare Part D claims than the average neurology physician in 2024
970 Medicare Part D claims for 104 beneficiaries, against an average of 1,370 among the 15,005 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims. 27 claims were for opioids.
Most prescribed
- Carbidopa-Levodopa231 claims
- Rytary148 claims
- Carbidopa-Levodopa Er135 claims
- Clonazepam46 claims
- Donepezil Hcl45 claims
- Amantadine40 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): 74.5 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).
Bills Medicare through one group practice
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Weldon Maas among 2,339 neurology physician records in California
James Weldon Maas, M.D. PH.D. is one of 2,339 neurology 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 2008, is newer than 52% of them.
- NPI issued2008 · 52% of these records are older, 42% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2006 · median 2006 among the 1,628 with a school on file
- Record last updated2008 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084N0400X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurology Physician providers in California
There are 2,339 neurology physician records in California.
All 2,339 in California → Every provider in San Francisco → Neurology Physician nationwide →
The 8 neurology physician records with the nearest ZIP codes
- Adam Boxer, M.D.San Francisco, CA 941431841231800
- Dorothee Chabas Chanezon, M.D.San Francisco, CA 941431902832645
- Anthony Chen, MDSan Francisco, CA 941431609834472
- Jacob Elkins, M.D.San Francisco, CA 941431336180298
- Adam Gazzaley, MD PH DSan Francisco, CA 941431932142205
- John Hixson, MDSan Francisco, CA 941431336130475
- Catherine Hoerth, M.D.San Francisco, CA 941431063449866
- Viktoriya Irodenko, M.D.San Francisco, CA 941431023044997
Common questions
What is James Weldon Maas, M.D. PH.D.'s NPI number?
James Weldon Maas, M.D. PH.D.'s National Provider Identifier (NPI) is 1255506788, issued on Apr 25, 2008. An NPI identifies a provider in billing; it is not a license.
Where is James Weldon Maas, M.D. PH.D. located?
The NPPES record lists a practice address at 505 Parnassus Avenue, San Francisco, CA, 94143. Phone: (415) 476-1489. Providers update this record themselves, so call before visiting.
How can I verify James Weldon Maas, M.D. PH.D.'s license?
NPPES lists California license number A102712, 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 James Weldon Maas, M.D. PH.D. prescribe under Medicare Part D?
In 2024, James Weldon Maas, M.D. PH.D. had 970 Medicare Part D claims for 104 beneficiaries; the average among neurology physician prescribers was 1,370. Part D covers Medicare prescriptions only.
What is James Weldon Maas, M.D. PH.D.'s MIPS final score?
The 2023 MIPS final score is 74.5 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.