Ken Ray Iwaoka, MD
Family Medicine Physician · Vista, CA
Ken Ray Iwaoka, MD is a family medicine physician with a practice address in Vista, California, and NPI 1346263670, issued on Jul 26, 2006. Check the license (California A48630, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ken Ray Iwaoka
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A48630 CA
Self-reported in NPPES; status is on the state search - Practice location
- 130 Cedar RD, Vista, CA 92083
- Phone
- (760) 806-5400
- Enumerated
- Jul 26, 2006
- Record last updated
- Apr 5, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicaid ID
- 00A486300 CA
- Medicare enrollment
- Enrolled (PECOS I20081204000135); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 130 Cedar RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Abigail Brantl, PTPhysical Therapist1821241639
- Larry Butler, PAPhysician Assistant1073138103
Verify Ken Ray Iwaoka in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A48630Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average family medicine physician in 2024
505 Medicare Part D claims for 319 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Azithromycin93 claims
- Doxycycline Hyclate47 claims
- Prednisone39 claims
- Albuterol Sulfate Hfa37 claims
- Amoxicillin-Clavulanate Potass31 claims
- Nitrofurantoin Mono-Macro27 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.
Bills Medicare through one group practice
- Hmts IncIrvine, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ken Ray Iwaoka among 17,133 family medicine physician records in California
Ken Ray Iwaoka, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1986 · median 2005 among the 10,652 with a school on file
- Record last updated2013 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
75 family medicine physician records list a practice address in Vista
They are 75 of the 2,017 NPPES records with a practice address in Vista, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Vista → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Hala Amr, MDVista, CA 920831891700258
- Joseph Castrejon, MDVista, CA 920831568486710
- Deryien Chen, MDVista, CA 920831902820103
- Jonathan Haynes, MDVista, CA 920831255397063
- Louis Hogrefe, MDVista, CA 920831841205218
- Melissa Hurd, M.D.Vista, CA 920831487643698
- Amad Kadry, M.D.Vista, CA 920831396855235
- Silvia Mendoza, PHYSICIAN ASSISTANTVista, CA 920831245232404
Common questions
What is Ken Ray Iwaoka, MD's NPI number?
Ken Ray Iwaoka, MD's National Provider Identifier (NPI) is 1346263670, issued on Jul 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ken Ray Iwaoka, MD located?
The NPPES record lists a practice address at 130 Cedar RD, Vista, CA, 92083. Phone: (760) 806-5400. Providers update this record themselves, so call before visiting.
How can I verify Ken Ray Iwaoka, MD's license?
NPPES lists California license number A48630, 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 Ken Ray Iwaoka, MD prescribe under Medicare Part D?
In 2024, Ken Ray Iwaoka, MD had 505 Medicare Part D claims for 319 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.