Gary Nissen, MD
NPI 1124550520 · Anesthesiology Physician · Springfield, OR
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gary Nissen, MD is a Anesthesiology Physician provider in Springfield, OR (NPI 1124550520).
Provider details
- NPI number
- 1124550520
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD203881 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
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
100% 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)
- 925 Seneca StSeattle, WA 98101Phone: (206) 583-6079
Registry dates
- Enumerated
- 2017-04-03
- Last updated
- 2022-03-22
- Certified
- 2022-03-22
Frequently asked questions
- What is Gary Nissen's NPI number?
- Gary Nissen's National Provider Identifier (NPI) is 1124550520, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gary Nissen's specialty?
- Gary Nissen is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Gary Nissen located?
- Gary Nissen's practice location on file with NPPES is 3333 Riverbend Dr, Springfield, OR 97477-8800.
- What is Gary Nissen's phone number?
- The practice phone number listed in the NPPES registry for Gary Nissen is (541) 681-5124.
- Does Gary Nissen accept Medicare?
- Gary Nissen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gary Nissen's NPI active?
- Yes — Gary Nissen's NPI (1124550520) is active in the NPPES registry as of the last update on 2022-03-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.