Peter Fay, MD
Internal Medicine Physician · Sunnyvale, CA
Peter Fay, MD is an internal medicine physician with a practice address in Sunnyvale, California, and NPI 1154384337, issued on Apr 10, 2006. Check the license (California A70138, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Peter Fay
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A70138 CA
Self-reported in NPPES; status is on the state search - Practice location
- 660 S Fair Oaks Ave, Sunnyvale, CA 94086
- Phone
- (408) 992-4858
- Enumerated
- Apr 10, 2006
- Record last updated
- Jan 4, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicaid ID
- 00A701380 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 660 S Fair Oaks Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rachel AcideraCommunity Health Registered Nurse1649696618
- Anthony Aguiar, RN, PHNCase Management Registered Nurse1326751991
- Daniela AnayaMarriage & Family Therapist1720567092
- Zoe AndersonMarriage & Family Therapist1568077204
- Mialynn ArimasCase Management Registered Nurse1720726185
- Aine Baum, M.A., MFTIMarriage & Family Therapist1053555763
Verify Peter Fay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A70138Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,058 Medicare Part D claims for 271 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 63 claims were for opioids.
Most prescribed
- Atorvastatin Calcium350 claims
- Amlodipine Besylate189 claims
- Metformin Hcl139 claims
- Losartan Potassium129 claims
- Tamsulosin Hcl120 claims
- Levothyroxine Sodium87 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): 80.6 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).
Peter Fay among 17,696 internal medicine physician records in California
Peter Fay, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2017 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
48 internal medicine physician records list a practice address in Sunnyvale
They are 48 of the 1,690 NPPES records with a practice address in Sunnyvale, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Sunnyvale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Priya Bhusri, M.D.Sunnyvale, CA 940861659386019
- Teresa Cheng, MDSunnyvale, CA 940861598772857
- Leon Cheng, MDSunnyvale, CA 940861104834407
- Anitha Gundupalli, MDSunnyvale, CA 940861568571206
- Grace Guo, MDSunnyvale, CA 940861902811375
- Jason Hwang, M.D.Sunnyvale, CA 940861669490926
- Quanjing Liu, MDSunnyvale, CA 940861760588834
- Robina Moen, M.D.Sunnyvale, CA 940861083720346
Common questions
What is Peter Fay, MD's NPI number?
Peter Fay, MD's National Provider Identifier (NPI) is 1154384337, issued on Apr 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Peter Fay, MD located?
The NPPES record lists a practice address at 660 S Fair Oaks Ave, Sunnyvale, CA, 94086. Phone: (408) 992-4858. Providers update this record themselves, so call before visiting.
How can I verify Peter Fay, MD's license?
NPPES lists California license number A70138, 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 Peter Fay, MD prescribe under Medicare Part D?
In 2024, Peter Fay, MD had 3,058 Medicare Part D claims for 271 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Peter Fay, MD's MIPS final score?
The 2023 MIPS final score is 80.6 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.