Jonathan A. Leff, M.D.
Research Study Specialist · Menlo Park, CA
Jonathan A. Leff, M.D. is a research study specialist with a practice address in Menlo Park, California, and NPI 1538407721, issued on Jan 22, 2013. Check the license (California G86872, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Jonathan A. Leff
- Credential
- M.D.
- Primary taxonomy
- Research Study Specialist 1744R1102X
- License number
- G86872 CA
Self-reported in NPPES; status is on the state search - Practice location
- 178 Seminary Dr, Menlo Park, CA 94025
- Phone
- (650) 521-0353
- Enumerated
- Jan 22, 2013
- Record last updated
- Jan 22, 2013 (not updated in 13 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest research study specialist records → All 82 in California → Look up another NPI →
Verify Jonathan A. Leff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G86872Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $138.83
1 payment: food and beverage; the largest payer was Genentech USA, Inc. The 14 providers of this specialty with any payment received $4,217.62 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.
Jonathan A. Leff among 82 research study specialist records in California
Jonathan A. Leff, M.D. is one of 82 research study specialist records with a practice address in California. 4% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 33% of them.
- NPI issued2013 · 33% of these records are older, 61% newer
- In a Medicare fileYes · 4% of these records are
- In the CMS Doctors and Clinicians fileNo · 1% of these records are
- Record last updated2013 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1744R1102X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Research Study Specialist providers in California
There are 82 research study specialist records in California.
All 82 in California → Every provider in Menlo Park → Research Study Specialist nationwide →
The 8 research study specialist records with the nearest ZIP codes
- Naama Barnea-Goraly, M.D.Menlo Park, CA 940251205372315
- Jon Haber, PHDMenlo Park, CA 940251053556142
- Jamie Dananberg, MDBrisbane, CA 940051134648397
- Joseph PaulsonSan Francisco, CA 941021275382277
- John RivieSan Francisco, CA 941021801217484
- Anthony Golsorkhi, MDSan Francisco, CA 941101669339776
- Laura Romo, MPHSan Francisco, CA 941101093259012
- Martha Shumway, PH.D.San Francisco, CA 941101376967455
Common questions
What is Jonathan A. Leff, M.D.'s NPI number?
Jonathan A. Leff, M.D.'s National Provider Identifier (NPI) is 1538407721, issued on Jan 22, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan A. Leff, M.D. located?
The NPPES record lists a practice address at 178 Seminary Dr, Menlo Park, CA, 94025. Phone: (650) 521-0353. Providers update this record themselves, so call before visiting.
How can I verify Jonathan A. Leff, M.D.'s license?
NPPES lists California license number G86872, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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.