Gregory Naughton, M.D.
Internal Medicine Physician · Roseville, CA
Gregory Naughton, M.D. is an internal medicine physician with a practice address in Roseville, California, and NPI 1578889507, issued on Apr 15, 2010. Check the license (California A118860, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory Naughton
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A118860 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1600 Eureka RD, Roseville, CA 95661
- Phone
- (916) 474-6590
- Enumerated
- Apr 15, 2010
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (916) 474-6591
- Medicare enrollment
- Enrolled (PECOS I20130612000181); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1600 Eureka RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Aleisha Anne Aguilar, NPStudent in an Organized Health Care Education/Training Program1053174953
Verify Gregory Naughton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A118860Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
97 Medicare Part D claims for 32 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 56 claims were for opioids.
Most prescribed
- Morphine Sulfate15 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.
Bills Medicare through one group practice
- Permanente Medical Group IncRoseville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Naughton among 17,696 internal medicine physician records in California
Gregory Naughton, 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 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2010 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
157 internal medicine physician records list a practice address in Roseville
They are 157 of the 5,340 NPPES records with a practice address in Roseville, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Roseville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Afshin Arya, M.D.Roseville, CA 956611548230287
- Jagdeep Bal, M.D.Roseville, CA 956611548252703
- Harinder Bisla, MDRoseville, CA 956611174512685
- Kenneth Michael Conroy, MDRoseville, CA 956611134108285
- Barbara Febbo-Wilson, M.D.Roseville, CA 956611154307700
- Baljinder Gill, MDRoseville, CA 956611790774784
- Devamani Gowda, MDRoseville, CA 956611962463455
- Thomas Hopkins, MDRoseville, CA 956611720045206
Common questions
What is Gregory Naughton, M.D.'s NPI number?
Gregory Naughton, M.D.'s National Provider Identifier (NPI) is 1578889507, issued on Apr 15, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Naughton, M.D. located?
The NPPES record lists a practice address at 1600 Eureka RD, Roseville, CA, 95661. Phone: (916) 474-6590. Providers update this record themselves, so call before visiting.
How can I verify Gregory Naughton, M.D.'s license?
NPPES lists California license number A118860, 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 Gregory Naughton, M.D. prescribe under Medicare Part D?
In 2024, Gregory Naughton, M.D. had 97 Medicare Part D claims for 32 beneficiaries; 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.