Grant Masaoka, M.D.
NPI 1780677120 · Specialist · Anaheim, CA
Grant Masaoka, M.D. is a Specialist provider in Anaheim, CA (NPI 1780677120).
Provider details
- NPI number
- 1780677120
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- License
- G19094 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
20 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$34 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-30
- Last updated
- 2007-07-09
Frequently asked questions
- What is Grant Masaoka's NPI number?
- Grant Masaoka's National Provider Identifier (NPI) is 1780677120, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grant Masaoka's specialty?
- Grant Masaoka is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Grant Masaoka located?
- Grant Masaoka's practice location on file with NPPES is 1781 W Romneya Dr, Anaheim, CA 92801-1818.
- What is Grant Masaoka's phone number?
- The practice phone number listed in the NPPES registry for Grant Masaoka is (714) 774-0414.
- Is Grant Masaoka's NPI active?
- Yes — Grant Masaoka's NPI (1780677120) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.