Shunpei Keith Iwata, M.D.
Internal Medicine Physician · Pasadena, CA
Shunpei Keith Iwata, M.D. is an internal medicine physician with a practice address in Pasadena, California, and NPI 1396931309, issued on Sep 24, 2007. Check the license (California A95845, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Shunpei Keith Iwata
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A95845 CA
Self-reported in NPPES; status is on the state search - Practice location
- 800 Fairmount Ave Ste 410, Pasadena, CA 91105
- Phone
- (626) 535-0900
- Enumerated
- Sep 24, 2007
- Record last updated
- Aug 27, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (626) 389-5479
- Medicare enrollment
- Enrolled (PECOS I20080514000697); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Shunpei Keith Iwata in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A95845Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% more Medicare Part D claims than the average internal medicine physician in 2024
3,470 Medicare Part D claims for 396 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
Most prescribed
- Atorvastatin Calcium356 claims
- Losartan Potassium301 claims
- Amlodipine Besylate233 claims
- Rosuvastatin Calcium182 claims
- Metformin Hcl176 claims
- Simvastatin173 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.
Shunpei Keith Iwata among 17,696 internal medicine physician records in California
Shunpei Keith Iwata, 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2004 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
137 internal medicine physician records list a practice address in Pasadena
They are 137 of the 10,525 NPPES records with a practice address in Pasadena, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Pasadena → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Dolores Barba, MDPasadena, CA 911051992700603
- Barry Blum, MDPasadena, CA 911051639141716
- Betsy Felser, MDPasadena, CA 911051144292897
- Todd Hee, M.D.Pasadena, CA 911051689648693
- Wei Huang-Lee, MDPasadena, CA 911051972576841
- George Jung, MDPasadena, CA 911051720051881
- Kristin Karlyn, MDPasadena, CA 911051033182530
- Malathi Narayan, MDPasadena, CA 911051588637466
Common questions
What is Shunpei Keith Iwata, M.D.'s NPI number?
Shunpei Keith Iwata, M.D.'s National Provider Identifier (NPI) is 1396931309, issued on Sep 24, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Shunpei Keith Iwata, M.D. located?
The NPPES record lists a practice address at 800 Fairmount Ave Ste 410, Pasadena, CA, 91105. Phone: (626) 535-0900. Providers update this record themselves, so call before visiting.
How can I verify Shunpei Keith Iwata, M.D.'s license?
NPPES lists California license number A95845, 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 Shunpei Keith Iwata, M.D. prescribe under Medicare Part D?
In 2024, Shunpei Keith Iwata, M.D. had 3,470 Medicare Part D claims for 396 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.