Stephen Gassner, MD, MPH
NPI 1538628524 · Emergency Medicine Physician · Orange, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Gassner, MD, MPH is a Emergency Medicine Physician provider in Orange, CA (NPI 1538628524).
Provider details
- NPI number
- 1538628524
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MPH
- Sex
- Male
- Sole proprietor
- No
- License
- A177552 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 27 | 27 |
| Ibuprofen | 19 | 19 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 17 | 17 |
| Cefpodoxime Proxetil | 15 | 15 |
| Tamsulosin Hcl | 13 | 13 |
| Ondansetronbrand: Ondansetron Odt | 12 | 12 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass |
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-03-18
- Last updated
- 2022-12-13
- Certified
- 2022-12-13
Frequently asked questions
- What is Stephen Gassner's NPI number?
- Stephen Gassner's National Provider Identifier (NPI) is 1538628524, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Gassner's specialty?
- Stephen Gassner is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Gassner located?
- Stephen Gassner's practice location on file with NPPES is 101 the City Dr S, Orange, CA 92868-3201.
- What is Stephen Gassner's phone number?
- The practice phone number listed in the NPPES registry for Stephen Gassner is (714) 456-5239.
- Does Stephen Gassner accept Medicare?
- Stephen Gassner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Gassner's NPI active?
- Yes — Stephen Gassner's NPI (1538628524) is active in the NPPES registry as of the last update on 2022-12-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.