Maureen M. Regan, MD
Internal Medicine Physician · Sonora, CA
Maureen M. Regan, MD is an internal medicine physician with a practice address in Sonora, California, and NPI 1477532273, issued on Jan 11, 2006. Check the license (California G61154, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Maureen M. Regan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G61154 CA
Self-reported in NPPES; status is on the state search - Practice location
- 690 Guzzi LN Ste C, Sonora, CA 95370
- Phone
- (209) 533-0333
- Enumerated
- Jan 11, 2006
- Record last updated
- Sep 17, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (209) 533-2749
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 690 Guzzi LN Ste C
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Martin Deilmann, M.D.Phlebology Physician1598024382
- Deborah Goreham, FNP-CFamily Nurse Practitioner1083014559
- Janene Phillips, RN, FNPAdult Health Nurse Practitioner1144255894
Verify Maureen M. Regan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G61154Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
148 Medicare Part D claims for 38 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Albuterol Sulfate Hfa12 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.
Maureen M. Regan among 17,696 internal medicine physician records in California
Maureen M. Regan, MD 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2008 · 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).
17 internal medicine physician records list a practice address in Sonora
They are 17 of the 629 NPPES records with a practice address in Sonora, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Sonora → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Allen, M.D.Sonora, CA 953701184687535
- Leslie Brocchini, MDSonora, CA 953701811966047
- Brenda Forrest, M.DSonora, CA 953701538375365
- Jason Jeffery, M.D.Sonora, CA 953701427293836
- Daniel Meador, MDSonora, CA 953701619925989
- James Mosson, M.D.Sonora, CA 953701437135670
- Daniel Phillips, M.D.Sonora, CA 953701720042732
- Reiker Schultz, MDSonora, CA 953701285910554
Common questions
What is Maureen M. Regan, MD's NPI number?
Maureen M. Regan, MD's National Provider Identifier (NPI) is 1477532273, issued on Jan 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Maureen M. Regan, MD located?
The NPPES record lists a practice address at 690 Guzzi LN Ste C, Sonora, CA, 95370. Phone: (209) 533-0333. Providers update this record themselves, so call before visiting.
How can I verify Maureen M. Regan, MD's license?
NPPES lists California license number G61154, 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 Maureen M. Regan, MD prescribe under Medicare Part D?
In 2024, Maureen M. Regan, MD had 148 Medicare Part D claims for 38 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.