DR. STEPHEN GASSNER MD, MPH
NPI 1538628524
Emergency Medicine in Orange, CA
About Dr. Stephen Gassner Md, Mph NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEPHEN GASSNER MD, MPH (NPI 1538628524) is an individual emergency medicine provider in Orange, California, licensed in California (A177552) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Stephen Gassner Md, Mph is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Stephen Gassner reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 219 clinicians in this Medicare group
Anaheim, CA 92807
- Reassigned Medicare billing, California enrollment
- 13,921 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92868 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ORANGE, CA 92868
ORANGE, CA 92868
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Stephen Gassner's NPI number?
The NPI number for Stephen Gassner is 1538628524. It was assigned to this individual provider in the NPPES registry on March 18, 2019.
Where is Stephen Gassner located?
Stephen Gassner practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (714) 456-5239.
What is Stephen Gassner's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Stephen Gassner enrolled in Medicare?
Yes. Stephen Gassner is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Stephen Gassner's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Gassner reassigns Medicare benefits to 2 organizations: Regents Of The University Of (Orange, CA) and Southern California Permanente Medical Group (Anaheim, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Stephen Gassner's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Stephen Gassner was last updated on December 13, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Stephen Gassner, MD, MPH · NPI 1538628524
Emergency Medicine physician in Orange, California. Individual provider, active in the CMS NPPES registry since March 18, 2019.
## Identity
- **NPI:** 1538628524 (Entity type: Individual)
- **Enumerated:** March 18, 2019
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A177552 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 THE CITY DR S, Orange, CA 92868-3201
- **Phone:** (714) 456-5239
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of (NPI 1154379394, Orange, CA); Southern California Permanente Medical Group (NPI 1952333460, Anaheim, CA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** December 13, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1538628524) · Data from the CMS NPPES public registry.