ALYSSA L MCGREGOR MD
NPI 1255865945
Anesthesiology in Seattle, WA
About Alyssa L Mcgregor Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALYSSA L MCGREGOR MD (NPI 1255865945) is an individual anesthesiology provider in Seattle, Washington, licensed in Washington (MD61162810) and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS, is affiliated with Evergreenhealth Medical Center, and is a graduate of University Of Arizona College Of Medicine (2017).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
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
Alyssa L Mcgregor 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 Reassignments
2Medicare enrollment records show Alyssa Mcgregor reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Seattle, WA 98104
- Reassigned Medicare billing, Washington enrollment
- 4,364 clinicians in this Medicare group
Bellevue, WA 98004
- Reassigned Medicare billing, Washington enrollment
- 94 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Evergreenhealth Medical Center
Acute Care Hospitals · Kirkland, WAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SEATTLE, WA 98195
SEATTLE, WA 98195
SEATTLE, WA 98195
SEATTLE, WA 98195
SEATTLE, WA 98195
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 Alyssa Mcgregor's NPI number?
The NPI number for Alyssa Mcgregor is 1255865945. It was assigned to this individual provider in the NPPES registry on April 19, 2017.
Where is Alyssa Mcgregor located?
Alyssa Mcgregor practices at 1959 NE Pacific St, Seattle, WA 98195. The listed phone number is (206) 520-5000.
What is Alyssa Mcgregor's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Alyssa Mcgregor enrolled in Medicare?
Yes. Alyssa Mcgregor 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 organizations bill Medicare for Alyssa Mcgregor's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alyssa Mcgregor reassigns Medicare benefits to 2 organizations: The Association Of University Physicians (Seattle, WA) and Matrix Anesthesia, Ps (Bellevue, WA). 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 Alyssa Mcgregor's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Alyssa Mcgregor accept?
Health plans from Premera Blue Cross Blue Shield of Alaska list Alyssa Mcgregor as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Alyssa Mcgregor affiliated with any hospitals?
According to CMS data, Alyssa Mcgregor is affiliated with Evergreenhealth Medical Center.
When was this NPI record last updated?
The NPPES record for Alyssa Mcgregor was last updated on May 3, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Alyssa L Mcgregor, MD · NPI 1255865945
Anesthesiology physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since April 19, 2017.
## Identity
- **NPI:** 1255865945 (Entity type: Individual)
- **Enumerated:** April 19, 2017
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** MD61162810 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1959 NE PACIFIC ST, Seattle, WA 98195-6540
- **Phone:** (206) 520-5000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): The Association Of University Physicians (NPI 1023041159, Seattle, WA); Matrix Anesthesia, Ps (NPI 1831146422, Bellevue, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Arizona College Of Medicine, class of 2017
## Record status
- **NPPES last updated:** May 3, 2021
- **Other identifiers:** Medicaid 1255865945 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1255865945) · Data from the CMS NPPES public registry.