Gregory Musselman, PA-C
NPI 1659829513 · Medical Physician Assistant · Ontario, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Musselman, PA-C is a Medical Physician Assistant provider in Ontario, CA (NPI 1659829513).
Provider details
- NPI number
- 1659829513
- Entity type
- Individual
- Primary specialty
- Medical Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 9471 Haven Ave Ste 140Rancho Cucamonga, CA 91730-5818Phone: (909) 474-2333
Registry dates
- Enumerated
- 2016-09-20
- Last updated
- 2018-09-26
Frequently asked questions
- What is Gregory Musselman's NPI number?
- Gregory Musselman's National Provider Identifier (NPI) is 1659829513, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Musselman's specialty?
- Gregory Musselman is listed in the NPPES registry with a primary specialty of Medical Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Gregory Musselman located?
- Gregory Musselman's practice location on file with NPPES is 3550 E Philadelphia St Ste 150, Ontario, CA 91761.
- What is Gregory Musselman's phone number?
- The practice phone number listed in the NPPES registry for Gregory Musselman is (909) 773-0022.
- Does Gregory Musselman accept Medicare?
- Gregory Musselman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Musselman's NPI active?
- Yes — Gregory Musselman's NPI (1659829513) is active in the NPPES registry as of the last update on 2018-09-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.