Loretta Margaret Obrien, MD
Infectious Disease Physician · Livermore, CA
Loretta Margaret Obrien, MD is an infectious disease physician with a practice address in Livermore, California, and NPI 1750379657, issued on Oct 13, 2005. Check the license (California G 87855, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Loretta Margaret Obrien
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- G 87855 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4951 Arroyo RD, Livermore, CA 94550
- Phone
- (925) 373-4700
- Enumerated
- Oct 13, 2005
- Record last updated
- Oct 23, 2008 (not updated in 18 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 4951 Arroyo RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sheila AlmiranezRegistered Nurse1194915199
- Rowena Anselmo, RNRegistered Nurse1275371973
- Ryan BarrettClinical Social Worker1629534185
- Peggy Berry, RN; LMFTPsychiatric/Mental Health Registered Nurse1902904097
- Anna Black, AU.D.Audiologist1740585702
- Samantha Bonilla, MSWSocial Worker1518777184
Verify Loretta Margaret Obrien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G 87855Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Loretta Margaret Obrien among 1,119 infectious disease physician records in California
Loretta Margaret Obrien, MD is one of 1,119 infectious disease 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 not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 96% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2008 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 1,119 in California → Every provider in Livermore → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Michael Ascher, M.D.Lafayette, CA 945491033427505
- James Pennington, M.D.Lafayette, CA 945491184962144
- Thuy-Trang Dang, MDMartinez, CA 945531407871478
- Shobha Sharma, DOMartinez, CA 945531326118290
- Raghesh Varot Kangath, M.DMartinez, CA 945531033340161
- Bryan Volpp, MDMartinez, CA 945531659356939
- Harkiran Grewal, MDCastro Valley, CA 945461790022416
- Steven Oppenheimer, MDCastro Valley, CA 945461962435396
Common questions
What is Loretta Margaret Obrien, MD's NPI number?
Loretta Margaret Obrien, MD's National Provider Identifier (NPI) is 1750379657, issued on Oct 13, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Loretta Margaret Obrien, MD located?
The NPPES record lists a practice address at 4951 Arroyo RD, Livermore, CA, 94550. Phone: (925) 373-4700. Providers update this record themselves, so call before visiting.
How can I verify Loretta Margaret Obrien, MD's license?
NPPES lists California license number G 87855, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.