Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Grant Roger Masaoka, M.D.
Specialist in Anaheim, CA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1780677120
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Registry record
Entity type Individual (Type 1)
Name Dr. Grant Roger Masaoka
Credential M.D.
Sex Male
Practice address 1781 W Romneya Dr, Suite E, Anaheim, CA, 92801
Phone (714) 774-0414
Fax (714) 774-0494
Enumeration date Aug 30, 2005
Last updated in NPPES Jul 9, 2007
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 00G190940 | Medicaid | CA | - |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What is the NPI number for Grant Masaoka?
The National Provider Identifier (NPI) for Grant Masaoka is 1780677120, a Type 1 (individual) record in the CMS NPPES registry.
Where does Grant Masaoka practice?
The practice location on file with NPPES is in Anaheim, CA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.