Nayan M. Shah, MD
Obstetrics & Gynecology Physician · Diamond Bar, CA
Nayan M. Shah, MD is an obstetrics & gynecology physician with a practice address in Diamond Bar, California, and NPI 1174631402, issued on Aug 28, 2006. Check the license (California A40253, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nayan M. Shah
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A40253 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1142 S Diamond Bar Blvd, Diamond Bar, CA 91765
- Phone
- (909) 268-3899
- Enumerated
- Aug 28, 2006
- Record last updated
- Apr 26, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (909) 598-8307
- Medicaid ID
- 00A402530 CA
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1142 S Diamond Bar Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Hsieh, M.D.Family Medicine Physician1891919874
Verify Nayan M. Shah in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A40253Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
20 Medicare Part D claims, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
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.
Nayan M. Shah among 5,088 obstetrics & gynecology physician records in California
Nayan M. Shah, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% 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, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2008 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Diamond Bar → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Jong Kim, M.D.,Diamond Bar, CA 917651053419176
- Emily Krasowsky, MDDiamond Bar, CA 917651669933552
- Anne Liao, MDDiamond Bar, CA 917651164099487
- Michael Maung, M.D.Diamond Bar, CA 917651225493810
- Geeta Patel, M.D.Ontario, CA 917641154414357
- Tahira Akram, MDPomona, CA 917671942202825
- Frank Chiang, MDPomona, CA 917671457456287
- David Choi, M.D.Pomona, CA 917671881947117
Common questions
What is Nayan M. Shah, MD's NPI number?
Nayan M. Shah, MD's National Provider Identifier (NPI) is 1174631402, issued on Aug 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Nayan M. Shah, MD located?
The NPPES record lists a practice address at 1142 S Diamond Bar Blvd, Diamond Bar, CA, 91765. Phone: (909) 268-3899. Providers update this record themselves, so call before visiting.
How can I verify Nayan M. Shah, MD's license?
NPPES lists California license number A40253, 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 Nayan M. Shah, MD prescribe under Medicare Part D?
In 2024, Nayan M. Shah, MD had 20 Medicare Part D claims; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
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.