Grant Roger Masaoka, M.D.
Specialist · Anaheim, CA
Grant Roger Masaoka, M.D. is a specialist with a practice address in Anaheim, California, and NPI 1780677120, issued on Aug 30, 2005. Check the license (California G19094, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Grant Roger Masaoka
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- G19094 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1781 W Romneya Dr, Anaheim, CA 92801
- Phone
- (714) 774-0414
- Enumerated
- Aug 30, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (714) 774-0494
- Medicaid ID
- 00G190940 CA
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 1781 W Romneya Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Grant Roger Masaoka in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G19094Check 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 specialist in 2024
16 Medicare Part D claims, against an average of 1,380 among the 8,233 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.
Industry payments in 2024: $33.52
2 payments; by number, the most common kind was food and beverage; the largest payer was Merck Sharp & Dohme LLC. The 5,844 providers of this specialty with any payment received $4,760.79 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.
Grant Roger Masaoka among 5,749 specialist records in California
Grant Roger Masaoka, M.D. is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileNo · 19% of these records are
- Record last updated2026 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in Anaheim → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Piya Ballani, MDAnaheim, CA 928011649225111
- Hsing Chung, M.D.Anaheim, CA 928011891723946
- Nooshin FarahmandAnaheim, CA 928011821013293
- William Foley, M.D.Anaheim, CA 928011700856598
- Babak Kasravi, M.D.Anaheim, CA 928011194786426
- Mahaveer Khemka, M.DAnaheim, CA 928011568449965
- Kevin Kuettel, M.D.Anaheim, CA 928011740286384
- Edward Levine, M.D.Anaheim, CA 928011194705335
Common questions
What is Grant Roger Masaoka, M.D.'s NPI number?
Grant Roger Masaoka, M.D.'s National Provider Identifier (NPI) is 1780677120, issued on Aug 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Grant Roger Masaoka, M.D. located?
The NPPES record lists a practice address at 1781 W Romneya Dr, Anaheim, CA, 92801. Phone: (714) 774-0414. Providers update this record themselves, so call before visiting.
How can I verify Grant Roger Masaoka, M.D.'s license?
NPPES lists California license number G19094, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Grant Roger Masaoka, M.D. prescribe under Medicare Part D?
In 2024, Grant Roger Masaoka, M.D. had 16 Medicare Part D claims; the average among specialist prescribers was 1,380. 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.