Peter G. O'Brien, FNP
Family Nurse Practitioner · Murrieta, CA
Peter G. O'Brien, FNP is a family nurse practitioner with a practice address in Murrieta, California, and NPI 1639533490, issued on Apr 7, 2016. Check the license (California 95003926, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Peter G. O'Brien
- Credential
- FNP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 95003926 CA
Self-reported in NPPES; status is on the state search - Practice location
- 41880 Kalmia St Ste 100, Murrieta, CA 92562
- Phone
- (951) 397-4226
- Enumerated
- Apr 7, 2016
- Record last updated
- Mar 10, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (951) 461-6973
- Medicare enrollment
- Enrolled (PECOS I20191108002409); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 16,966 in California → Look up another NPI →
Also registered at 41880 Kalmia St Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lisa Blais, NPFamily Nurse Practitioner1851930168
- Scott Dombroski, PA-CPhysician Assistant1588874283
- Ebony HilleryFamily Nurse Practitioner1730822875
- Basharat Hussain, PAPhysician Assistant1396193868
- Heather Ontiveros, PA-CPhysician Assistant1386890838
- Amber Payne, PHYSICIAN ASSISTANTPhysician Assistant1942361027
Verify Peter G. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 95003926Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average family nurse practitioner in 2024
425 Medicare Part D claims for 263 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 17 claims were for opioids.
Most prescribed
- Azithromycin61 claims
- Prednisone33 claims
- Methylprednisolone30 claims
- Amoxicillin-Clavulanate Potass28 claims
- Nitrofurantoin Mono-Macro28 claims
- Albuterol Sulfate Hfa27 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.
Industry payments in 2024: $31.02
1 payment: food and beverage; the largest payer was Abbvie Inc. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Southern California Urgent Care NetworkMurrieta, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter G. O'Brien among 16,966 family nurse practitioner records in California
Peter G. O'Brien, FNP is one of 16,966 family nurse practitioner records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 35% of them.
- NPI issued2016 · 35% of these records are older, 60% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2016 · median 2019 among the 6,793 with a school on file
- Record last updated2020 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
100 family nurse practitioner records list a practice address in Murrieta
They are 100 of the 2,999 NPPES records with a practice address in Murrieta, and 16,966 family nurse practitioner records in California.
All 16,966 in California → Every provider in Murrieta → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Liza Alvarado, NPMurrieta, CA 925621124403993
- Meldy Avila, NPMurrieta, CA 925621760623854
- Gracious Basa, FNPMurrieta, CA 925621649555939
- Mona Breid, NP-CMurrieta, CA 925621205104726
- Maureen Eghreriniovo, NURSE PRACTITIONERMurrieta, CA 925621770765547
- Laurieann Gilbert, FNPMurrieta, CA 925621629461744
- Fatimah Harvey, FNPMurrieta, CA 925621053727982
- Nicole Houle, NP-C, RNFAMurrieta, CA 925621790873230
Common questions
What is Peter G. O'Brien, FNP's NPI number?
Peter G. O'Brien, FNP's National Provider Identifier (NPI) is 1639533490, issued on Apr 7, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Peter G. O'Brien, FNP located?
The NPPES record lists a practice address at 41880 Kalmia St Ste 100, Murrieta, CA, 92562. Phone: (951) 397-4226. Providers update this record themselves, so call before visiting.
How can I verify Peter G. O'Brien, FNP's license?
NPPES lists California license number 95003926, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Peter G. O'Brien, FNP prescribe under Medicare Part D?
In 2024, Peter G. O'Brien, FNP had 425 Medicare Part D claims for 263 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.