Roy Masato Hayashi, D.M.D
Endodontics · Foothill Ranch, CA
Roy Masato Hayashi, D.M.D is an endodontics with a practice address in Foothill Ranch, California, and NPI 1922151638, issued on Jan 18, 2007. Check the license (California 53528, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Roy Masato Hayashi
- Credential
- D.M.D
- Primary taxonomy
- Endodontics 1223E0200X
- License number
- 53528 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27462 Portola Pkwy, Foothill Ranch, CA 92610
- Phone
- (949) 273-8575
- Enumerated
- Jan 18, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (949) 273-8577
- Entity
- Type 1 · individual
8 nearest endodontics records → All 1,018 in California → Look up another NPI →
Also registered at 27462 Portola Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jason Ballou, DDSDentist1659461739
Verify Roy Masato Hayashi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 53528Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% fewer Medicare Part D claims than the average endodontics in 2024
60 Medicare Part D claims for 56 beneficiaries, against an average of 121 among the 4,119 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Amoxicillin32 claims
- Clindamycin Hcl17 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: $300.50
6 payments; by number, the most common kind was food and beverage; the largest payer was Dentsply Sirona Inc. The 2,057 providers of this specialty with any payment received $49,739.86 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.
Roy Masato Hayashi among 1,018 endodontics records in California
Roy Masato Hayashi, D.M.D is one of 1,018 endodontics records with a practice address in California. 68% 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 27% of them.
- NPI issued2007 · 27% of these records are older, 42% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2007 · 78% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223E0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2 endodontics records list a practice address in Foothill Ranch
They are 2 of the 169 NPPES records with a practice address in Foothill Ranch, and 1,018 endodontics records in California.
All 1,018 in California → Every provider in Foothill Ranch → Endodontics nationwide →
The 8 endodontics records with the nearest ZIP codes
- Aaron Salimnia, DDSFoothill Ranch, CA 926101912440546
- Clark Izu, D.D.S.Irvine, CA 926061114283033
- Reuben Johnson, D.D.S.Irvine, CA 926141750646261
- Peter Cancellier, D.D.S.Irvine, CA 926041285788976
- Jason Cho, D.D.S.Irvine, CA 926041487818787
- Ayat Elsherif, DDSIrvine, CA 926041912497868
- Robert Morrison, D.D.S.Irvine, CA 926041235268038
- Paulene Salter, DDSIrvine, CA 926041023335981
Common questions
What is Roy Masato Hayashi, D.M.D's NPI number?
Roy Masato Hayashi, D.M.D's National Provider Identifier (NPI) is 1922151638, issued on Jan 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Roy Masato Hayashi, D.M.D located?
The NPPES record lists a practice address at 27462 Portola Pkwy, Foothill Ranch, CA, 92610. Phone: (949) 273-8575. Providers update this record themselves, so call before visiting.
How can I verify Roy Masato Hayashi, D.M.D's license?
NPPES lists California license number 53528, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Roy Masato Hayashi, D.M.D prescribe under Medicare Part D?
In 2024, Roy Masato Hayashi, D.M.D had 60 Medicare Part D claims for 56 beneficiaries; the average among endodontics prescribers was 121. 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.