Aileen Nagako Watanabe, MD
Internal Medicine Physician · San Francisco, CA
Aileen Nagako Watanabe, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1912993627, issued on Sep 27, 2005. Check the license (California G52863, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Aileen Nagako Watanabe
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G52863 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2186 Geary Blvd, San Francisco, CA 94115
- Phone
- (415) 292-3500
- Enumerated
- Sep 27, 2005
- Record last updated
- Apr 28, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (415) 292-7500
- Medicaid ID
- 00G528630 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2186 Geary Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Aileen Nagako Watanabe in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G52863Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,603 Medicare Part D claims for 128 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium186 claims
- Losartan Potassium82 claims
- Amlodipine Besylate73 claims
- Hydrochlorothiazide63 claims
- Eliquis58 claims
- Metformin Hcl58 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.
Industry payments in 2024: $24.97
1 payment: food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Aileen Nagako Watanabe among 17,696 internal medicine physician records in California
Aileen Nagako Watanabe, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2011 · 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).
1,318 internal medicine physician records list a practice address in San Francisco
They are 1,318 of the 38,143 NPPES records with a practice address in San Francisco, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Francisco → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Gary Arsham, M.D.San Francisco, CA 941151487646758
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- C Cooney, M.D.San Francisco, CA 941151255332094
- Sarita Dubey, MDSan Francisco, CA 941151316905466
- Meredith Heller, M.D.San Francisco, CA 941151073562096
- Alan Leung, MDSan Francisco, CA 941151245222330
- Susan Nguyen, MDSan Francisco, CA 941151164470696
- Daniel Null, MDSan Francisco, CA 941151689638744
Common questions
What is Aileen Nagako Watanabe, MD's NPI number?
Aileen Nagako Watanabe, MD's National Provider Identifier (NPI) is 1912993627, issued on Sep 27, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Aileen Nagako Watanabe, MD located?
The NPPES record lists a practice address at 2186 Geary Blvd, San Francisco, CA, 94115. Phone: (415) 292-3500. Providers update this record themselves, so call before visiting.
How can I verify Aileen Nagako Watanabe, MD's license?
NPPES lists California license number G52863, 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 Aileen Nagako Watanabe, MD prescribe under Medicare Part D?
In 2024, Aileen Nagako Watanabe, MD had 1,603 Medicare Part D claims for 128 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.