GARY MICHAEL NISSEN MD
NPI 1124550520
Anesthesiology in Springfield, OR
About Gary Michael Nissen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GARY MICHAEL NISSEN MD (NPI 1124550520) is an individual anesthesiology provider in Springfield, Oregon, licensed in Oregon (MD203881) and active in the NPI registry since April 2017. He is enrolled in Medicare PECOS, is affiliated with Mckenzie-willamette Medical Center, and maintains a secondary practice location in Seattle.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Gary Michael Nissen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Gary Nissen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Springfield, OR 97477
- Reassigned Medicare billing, Oregon enrollment
- 123 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mckenzie-Willamette Medical Center
Acute Care Hospitals · Springfield, ORSacred Heart Medical Center - Riverbend
Acute Care Hospitals · Springfield, OROther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SPRINGFIELD, OR 97477
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 Gary Nissen's NPI number?
The NPI number for Gary Nissen is 1124550520. It was assigned to this individual provider in the NPPES registry on April 3, 2017.
Where is Gary Nissen located?
Gary Nissen practices at 3333 Riverbend Dr, Springfield, OR 97477. The listed phone number is (541) 681-5124.
What is Gary Nissen's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Gary Nissen enrolled in Medicare?
Yes. Gary Nissen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Gary Nissen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gary Nissen reassigns Medicare benefits to Northwest Anesthesia Physicians PC (Springfield, OR). The 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 Gary Nissen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Gary Nissen affiliated with any hospitals?
According to CMS data, Gary Nissen is affiliated with Mckenzie-Willamette Medical Center and Sacred Heart Medical Center - Riverbend.
When was this NPI record last updated?
The NPPES record for Gary Nissen was last updated on March 22, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Gary Michael Nissen, MD · NPI 1124550520
Anesthesiology physician in Springfield, Oregon. Individual provider, active in the CMS NPPES registry since April 3, 2017.
## Identity
- **NPI:** 1124550520 (Entity type: Individual)
- **Enumerated:** April 3, 2017
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** MD203881 (Oregon)
- **Sole proprietor:** No
## Practice location
- **Address:** 3333 RIVERBEND DR, Springfield, OR 97477-8800
- **Phone:** (541) 681-5124
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Northwest Anesthesia Physicians PC (NPI 1770531196, Springfield, OR), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Creighton University School Of Medicine, class of 2017
## Record status
- **NPPES last updated:** March 22, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1124550520) · Data from the CMS NPPES public registry.