Tiffany Ly, M.D.
Internal Medicine Physician · Menlo Park, CA
Tiffany Ly, M.D. is an internal medicine physician with a practice address in Menlo Park, California, and NPI 1235428038, issued on Apr 1, 2011. Check the license (California A123352, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tiffany Ly
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A123352 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3500 Alameda DE Las Pulgas Ste 200, Menlo Park, CA 94025
- Phone
- (650) 815-9577
- Enumerated
- Apr 1, 2011
- Record last updated
- Apr 30, 2025
- Fax
- (650) 289-0166
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 3500 Alameda DE Las Pulgas Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Laura Webb, MDPediatrics Physician1104084110
Verify Tiffany Ly in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A123352Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
30% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,226 Medicare Part D claims for 254 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Atorvastatin Calcium179 claims
- Levothyroxine Sodium142 claims
- Rosuvastatin Calcium128 claims
- Amlodipine Besylate123 claims
- Losartan Potassium79 claims
- Omeprazole73 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.
Tiffany Ly among 17,696 internal medicine physician records in California
Tiffany Ly, M.D. 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 2011, is newer than 66% of them.
- NPI issued2011 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2025 · 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).
47 internal medicine physician records list a practice address in Menlo Park
They are 47 of the 1,265 NPPES records with a practice address in Menlo Park, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Menlo Park → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Yumi Ando, M.D.Menlo Park, CA 940251376658146
- Sara Bunting, MDMenlo Park, CA 940251639181381
- Linda Fresco, MDMenlo Park, CA 940251811092901
- Susan Garay, MDMenlo Park, CA 940251437114006
- F McDowell, MDMenlo Park, CA 940251154384576
- Eileen Moy, MDMenlo Park, CA 940251083617583
- Anthony Powell, MDMenlo Park, CA 940251740247899
- Kristen Sherman, M.D.Menlo Park, CA 940251770513335
Common questions
What is Tiffany Ly, M.D.'s NPI number?
Tiffany Ly, M.D.'s National Provider Identifier (NPI) is 1235428038, issued on Apr 1, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Tiffany Ly, M.D. located?
The NPPES record lists a practice address at 3500 Alameda DE Las Pulgas Ste 200, Menlo Park, CA, 94025. Phone: (650) 815-9577. Providers update this record themselves, so call before visiting.
How can I verify Tiffany Ly, M.D.'s license?
NPPES lists California license number A123352, 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 Tiffany Ly, M.D. prescribe under Medicare Part D?
In 2024, Tiffany Ly, M.D. had 2,226 Medicare Part D claims for 254 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.