Sam Masao Nakamura, M.D.
Internal Medicine Physician · Santa Ana, CA
Sam Masao Nakamura, M.D. is an internal medicine physician with a practice address in Santa Ana, California, and NPI 1386011369, issued on Aug 26, 2015. Check the license (California A48876, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sam Masao Nakamura
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A48876 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1502 West Surrey Circle, Santa Ana, CA 92704
- Phone
- (714) 623-2383
- Enumerated
- Aug 26, 2015
- Record last updated
- Aug 26, 2015 (not updated in 11 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Sam Masao Nakamura in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A48876Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
15 Medicare Part D claims, against an average of 3,176 among the 108,855 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.
Sam Masao Nakamura among 17,696 internal medicine physician records in California
Sam Masao Nakamura, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 76% of them.
- NPI issued2015 · 76% of these records are older, 21% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2015 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in California
There are 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Santa Ana → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ronnie Alas, M.D.Santa Ana, CA 927041306267026
- Robert Castro, DOSanta Ana, CA 927041285777813
- Robin Hatam, D.O.Santa Ana, CA 927041194053785
- Iyad Houshan, M.D.Santa Ana, CA 927041497773287
- Wesam Houshan, MDSanta Ana, CA 927041356467112
- Ajay Meka, M.D.Santa Ana, CA 927041063527976
- Meena Meka, M.D.Santa Ana, CA 927041013338722
- Madhavi Mulye, M.D.Santa Ana, CA 927041205056470
Common questions
What is Sam Masao Nakamura, M.D.'s NPI number?
Sam Masao Nakamura, M.D.'s National Provider Identifier (NPI) is 1386011369, issued on Aug 26, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Sam Masao Nakamura, M.D. located?
The NPPES record lists a practice address at 1502 West Surrey Circle, Santa Ana, CA, 92704. Phone: (714) 623-2383. Providers update this record themselves, so call before visiting.
How can I verify Sam Masao Nakamura, M.D.'s license?
NPPES lists California license number A48876, 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 Sam Masao Nakamura, M.D. prescribe under Medicare Part D?
In 2024, Sam Masao Nakamura, M.D. had 15 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.