Kosuke Ken Iwaki, M.D.
Internal Medicine Physician · Fresno, CA
Kosuke Ken Iwaki, M.D. is an internal medicine physician with a practice address in Fresno, California, and NPI 1386091585, issued on May 17, 2016. Check the license (California A162107, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kosuke Ken Iwaki
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A162107 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1303 E Herndon Ave, Fresno, CA 93720
- Phone
- (559) 450-5611
- Enumerated
- May 17, 2016
- Record last updated
- Dec 11, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (559) 450-7470
- Medicare enrollment
- Enrolled (PECOS I20201026001624); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1303 E Herndon Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Kosuke Ken Iwaki in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A162107Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
46 Medicare Part D claims for 15 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through one group practice
- Icahn School OF Medicine AT Mount SinaiElmhurst, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kosuke Ken Iwaki among 17,696 internal medicine physician records in California
Kosuke Ken Iwaki, 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 2016, is newer than 79% of them.
- NPI issued2016 · 79% of these records are older, 19% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2015 · median 2004 among the 11,065 with a school on file
- Record last updated2019 · 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).
335 internal medicine physician records list a practice address in Fresno
They are 335 of the 19,440 NPPES records with a practice address in Fresno, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Fresno → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Linda Bartell, MDFresno, CA 937201568458966
- Brenda Berry, MDFresno, CA 937201942295381
- Roger Gong, MDFresno, CA 937201598751059
- Alex Habibe, MDFresno, CA 937201629075395
- Dharampal Johal, M.D.Fresno, CA 937201275530529
- Helen Jones, MDFresno, CA 937201164418372
- Carol Kim, M.D.Fresno, CA 937201285629303
- Jean Linder, MDFresno, CA 937201962498428
Common questions
What is Kosuke Ken Iwaki, M.D.'s NPI number?
Kosuke Ken Iwaki, M.D.'s National Provider Identifier (NPI) is 1386091585, issued on May 17, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Kosuke Ken Iwaki, M.D. located?
The NPPES record lists a practice address at 1303 E Herndon Ave, Fresno, CA, 93720. Phone: (559) 450-5611. Providers update this record themselves, so call before visiting.
How can I verify Kosuke Ken Iwaki, M.D.'s license?
NPPES lists California license number A162107, 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 Kosuke Ken Iwaki, M.D. prescribe under Medicare Part D?
In 2024, Kosuke Ken Iwaki, M.D. had 46 Medicare Part D claims for 15 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.