Michael S. Greenfield, M.D.
Endocrinology, Diabetes & Metabolism Physician · Mountain View, CA
Michael S. Greenfield, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Mountain View, California, and NPI 1295873685, issued on Feb 1, 2007. Check the license (California G35253, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael S. Greenfield
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- G35253 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2500 Hospital Dr, Mountain View, CA 94040
- Phone
- (650) 965-7500
- Enumerated
- Feb 1, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090114000534); may accept Medicare assignment
- Medical or professional school
- Harvard Medical School, 1974
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 2500 Hospital Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Bronstone, M.D.Gastroenterology Physician1568519254
- Dean Cummings, MDInternal Medicine Physician1265454029
- Patricia Einarson, MD, MBAFamily Medicine Physician1750375796
- Lawrence Epstein, MDInternal Medicine Physician1093817728
- Ahuva Faraji, M.A, MFTMarriage & Family Therapist1255762290
- Thomas Farris, DDSGeneral Practice Dentistry1457443442
Verify Michael S. Greenfield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G35253Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,776 Medicare Part D claims for 234 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of claims.
Most prescribed
- Rosuvastatin Calcium231 claims
- Levothyroxine Sodium188 claims
- Metformin Hcl Er150 claims
- Metformin Hcl147 claims
- Synthroid138 claims
- Jardiance135 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): 74.2 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).
Industry payments in 2024: $99.96
6 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 5,661 providers of this specialty with any payment received $5,742.15 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.
Michael S. Greenfield among 1,131 endocrinology, diabetes & metabolism physician records in California
Michael S. Greenfield, M.D. is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% 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 46% of them.
- NPI issued2007 · 46% of these records are older, 42% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1974 · median 2003 among the 779 with a school on file
- Record last updated2007 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Mountain View → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Sidra Azim, M.D.Mountain View, CA 940401043598378
- Eva Balint, M.D.Mountain View, CA 940401669578951
- Lynn Bennion, M.D.Mountain View, CA 940401235181728
- Leonard Doberne, M.D.Mountain View, CA 940401558447847
- Soo Eng, MDMountain View, CA 940401316024920
- Todd Kaye, MDMountain View, CA 940401295787646
- Katayoun Lotfi, MDMountain View, CA 940401619288685
- Linda Membreno, MDMountain View, CA 940401740231919
Common questions
What is Michael S. Greenfield, M.D.'s NPI number?
Michael S. Greenfield, M.D.'s National Provider Identifier (NPI) is 1295873685, issued on Feb 1, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Michael S. Greenfield, M.D. located?
The NPPES record lists a practice address at 2500 Hospital Dr, Mountain View, CA, 94040. Phone: (650) 965-7500. Providers update this record themselves, so call before visiting.
How can I verify Michael S. Greenfield, M.D.'s license?
NPPES lists California license number G35253, 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 Michael S. Greenfield, M.D. prescribe under Medicare Part D?
In 2024, Michael S. Greenfield, M.D. had 2,776 Medicare Part D claims for 234 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
What is Michael S. Greenfield, M.D.'s MIPS final score?
The 2023 MIPS final score is 74.2 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.