May C. Shein, M.D.
Family Medicine Physician · Fremont, CA
May C. Shein, M.D. is a family medicine physician with a practice address in Fremont, California, and NPI 1255565008, issued on May 7, 2009. Check the license (California A109552, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- May C. Shein
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A109552 CA
Self-reported in NPPES; status is on the state search - Practice location
- 39500 Liberty St, Fremont, CA 94538
- Phone
- (510) 770-8040
- Enumerated
- May 7, 2009
- Record last updated
- May 15, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110407000569); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 39500 Liberty St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify May C. Shein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A109552Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% fewer Medicare Part D claims than the average family medicine physician in 2024
2,004 Medicare Part D claims for 189 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims. 35 claims were for opioids.
Most prescribed
- Atorvastatin Calcium147 claims
- Biktarvy109 claims
- Amlodipine Besylate103 claims
- Metformin Hcl76 claims
- Losartan Potassium73 claims
- Gabapentin59 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): 91 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
- Alameda Health SystemHayward, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
May C. Shein among 17,133 family medicine physician records in California
May C. Shein, M.D. is one of 17,133 family 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 58% of them.
- NPI issued2009 · 58% of these records are older, 40% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1999 · median 2005 among the 10,652 with a school on file
- Record last updated2014 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
90 family medicine physician records list a practice address in Fremont
They are 90 of the 4,749 NPPES records with a practice address in Fremont, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Fremont → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
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- Caroline Garcia, MDFremont, CA 945381922114180
- Kelly Renee Miller, MDFremont, CA 945381841286705
- Durriyah Mogri, MDFremont, CA 945381386670784
- Aruna Reddy, MDFremont, CA 945381225034556
- Ranjana Sharma, MDFremont, CA 945381548270119
Common questions
What is May C. Shein, M.D.'s NPI number?
May C. Shein, M.D.'s National Provider Identifier (NPI) is 1255565008, issued on May 7, 2009. An NPI identifies a provider in billing; it is not a license.
Where is May C. Shein, M.D. located?
The NPPES record lists a practice address at 39500 Liberty St, Fremont, CA, 94538. Phone: (510) 770-8040. Providers update this record themselves, so call before visiting.
How can I verify May C. Shein, M.D.'s license?
NPPES lists California license number A109552, 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 May C. Shein, M.D. prescribe under Medicare Part D?
In 2024, May C. Shein, M.D. had 2,004 Medicare Part D claims for 189 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is May C. Shein, M.D.'s MIPS final score?
The 2023 MIPS final score is 91 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.