Gregory J. Musselman, PA-C
Medical Physician Assistant · Ontario, CA
Gregory J. Musselman, PA-C is a medical physician assistant with a practice address in Ontario, California, and NPI 1659829513, issued on Sep 20, 2016. Check the license with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory J. Musselman
- Credential
- PA-C
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- Practice location
- 3550 E Philadelphia St Ste 150, Ontario, CA 91761
- Phone
- (909) 773-0022
- Enumerated
- Sep 20, 2016
- Record last updated
- Sep 26, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20170724002629); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 3,376 in California → Look up another NPI →
Also registered at 3550 E Philadelphia St Ste 150
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jun Hyeok ChoiPhysician Assistant1801713326
- Carol Kwak, PA-CPhysician Assistant1891303293
Verify Gregory J. Musselman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- American Current Care OF California A Medical CorporationBakersfield, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory J. Musselman among 3,376 medical physician assistant records in California
Gregory J. Musselman, PA-C is one of 3,376 medical physician assistant records with a practice address in California. 69% 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 66% of them.
- NPI issued2016 · 66% of these records are older, 31% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2016 · median 2012 among the 1,347 with a school on file
- Record last updated2018 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Physician Assistant providers in California
There are 3,376 medical physician assistant records in California.
All 3,376 in California → Every provider in Ontario → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Lilian Chou, PA-COntario, CA 917611306175021
- Brett Heslop, PA-COntario, CA 917611942601018
- Rafael Romero, PA-COntario, CA 917611801127170
- Cristina VelasquezOntario, CA 917611114735511
- Audrey WagdyOntario, CA 917611366225906
- Jennifer Yim, PA-COntario, CA 917621588907802
- Esther Agepogu, PA-CMontclair, CA 917631982846499
- Charinda Charoen, P.A.Montclair, CA 917631437440625
Common questions
What is Gregory J. Musselman, PA-C's NPI number?
Gregory J. Musselman, PA-C's National Provider Identifier (NPI) is 1659829513, issued on Sep 20, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Gregory J. Musselman, PA-C located?
The NPPES record lists a practice address at 3550 E Philadelphia St Ste 150, Ontario, CA, 91761. Phone: (909) 773-0022. Providers update this record themselves, so call before visiting.
How can I verify Gregory J. Musselman, PA-C's license?
Search the California board that licenses this profession; the NPPES record confirms identity 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.