Ryuko Ishikawa, MD
Psychiatry Physician · San Mateo, CA
Ryuko Ishikawa, MD is a psychiatry physician with a practice address in San Mateo, California, and NPI 1053629634, issued on Sep 17, 2010. Check the license (California A42754, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ryuko Ishikawa
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A42754 CA
Self-reported in NPPES; status is on the state search - Practice location
- 138 E Hillsdale Blvd, San Mateo, CA 94403
- Phone
- (415) 640-1455
- Enumerated
- Sep 17, 2010
- Record last updated
- Jan 19, 2024
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Verify Ryuko Ishikawa in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A42754Check 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: $23.20
1 payment: food and beverage; the largest payer was Alkermes, Inc. The 13,693 providers of this specialty with any payment received $4,954.93 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.
Ryuko Ishikawa among 8,673 psychiatry physician records in California
Ryuko Ishikawa, MD is one of 8,673 psychiatry physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 60% of them.
- NPI issued2010 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2024 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
89 psychiatry physician records list a practice address in San Mateo
They are 89 of the 3,909 NPPES records with a practice address in San Mateo, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in San Mateo → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Kathleen Akiyama, M.D.San Mateo, CA 944031194886879
- Nasrin Bashiri, MDSan Mateo, CA 944031700974920
- Hung-Ming Chu, M.D.San Mateo, CA 944031790834174
- Vikas Duvvuri, M.D., PH.D.San Mateo, CA 944031255470480
- D. Feeley, M.D.San Mateo, CA 944031548351158
- Mina Fisher, M.D.San Mateo, CA 944031124037874
- Nandini Ganpule, MDSan Mateo, CA 944031326110156
- Lynne Haynes-Tucker, MDSan Mateo, CA 944031689737157
Common questions
What is Ryuko Ishikawa, MD's NPI number?
Ryuko Ishikawa, MD's National Provider Identifier (NPI) is 1053629634, issued on Sep 17, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Ryuko Ishikawa, MD located?
The NPPES record lists a practice address at 138 E Hillsdale Blvd, San Mateo, CA, 94403. Phone: (415) 640-1455. Providers update this record themselves, so call before visiting.
How can I verify Ryuko Ishikawa, MD's license?
NPPES lists California license number A42754, 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.
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.