Amy Haruko Matayoshi, M.D.
Nephrology Physician · Oceanside, CA
Amy Haruko Matayoshi, M.D. is a nephrology physician with a practice address in Oceanside, California, and NPI 1417921982, issued on Feb 14, 2006. Check the license (California A60790, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Amy Haruko Matayoshi
- Credential
- M.D.
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- A60790 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3300 Vista Way, Oceanside, CA 92056
- Phone
- (760) 967-9900
- Enumerated
- Feb 14, 2006
- Record last updated
- Feb 2, 2026
- Fax
- (760) 967-6769
- Medicare enrollment
- Enrolled (PECOS I20110912000124); accepts Medicare assignment
- Medical or professional school
- University Of Hawaii John A. Burns School Of Medicine, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 3300 Vista Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Richard Barager, MDNephrology Physician1508864448
- Christopher Hupfeld, M.D.Endocrinology, Diabetes & Metabolism Physician1568429165
Verify Amy Haruko Matayoshi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A60790Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% more Medicare Part D claims than the average nephrology physician in 2024
2,574 Medicare Part D claims for 258 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Amlodipine Besylate205 claims
- Hydralazine Hcl170 claims
- Furosemide154 claims
- Sevelamer Carbonate154 claims
- Allopurinol143 claims
- Lisinopril128 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: $50.38
2 payments; by number, the most common kind was education; the largest payer was Nxstage Medical, Inc. The 8,230 providers of this specialty with any payment received $3,091.37 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.
Bills Medicare through one group practice
- Balboa Nephrology Medical Group IncOceanside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Amy Haruko Matayoshi among 1,468 nephrology physician records in California
Amy Haruko Matayoshi, M.D. is one of 1,468 nephrology physician records with a practice address in California. 88% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 48% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1995 · median 2001 among the 1,128 with a school on file
- Record last updated2026 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Oceanside → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Richard Barager, MDOceanside, CA 920561508864448
- Talar Kharadjian, MDOceanside, CA 920561770938201
- Naing Kyaw, MDOceanside, CA 920561689784308
- Andrew Liu, MDOceanside, CA 920561710481866
- Avi Hettena, M.D.Rancho Santa Fe, CA 920671013029487
- Clyde Beck, Jr., MDLa Jolla, CA 920371457797169
- Mark Boiskin, M.D.La Jolla, CA 920371437154143
- Melanie Farrell, M.D.La Jolla, CA 920371144322850
Common questions
What is Amy Haruko Matayoshi, M.D.'s NPI number?
Amy Haruko Matayoshi, M.D.'s National Provider Identifier (NPI) is 1417921982, issued on Feb 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Amy Haruko Matayoshi, M.D. located?
The NPPES record lists a practice address at 3300 Vista Way, Oceanside, CA, 92056. Phone: (760) 967-9900. Providers update this record themselves, so call before visiting.
How can I verify Amy Haruko Matayoshi, M.D.'s license?
NPPES lists California license number A60790, 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 Amy Haruko Matayoshi, M.D. prescribe under Medicare Part D?
In 2024, Amy Haruko Matayoshi, M.D. had 2,574 Medicare Part D claims for 258 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.