ELAINE MAST
NPI 1609231430
Nurse Anesthetist, Certified Registered in Seattle, WA
About Elaine Mast NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELAINE MAST (NPI 1609231430) is an individual nurse anesthetist, certified registered in Seattle, Washington, licensed in Washington (AP60621373) and active in the NPI registry since December 2015. She is affiliated with University Of Washington Medical Ctr and is a graduate of Other (2015).
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
Elaine Mast 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
4Medicare enrollment records show Elaine Mast reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Seattle, WA 98109
- Reassigned Medicare billing, Washington enrollment
- 2,678 clinicians in this Medicare group
Seattle, WA 98104
- Reassigned Medicare billing, Washington enrollment
- 4,364 clinicians in this Medicare group
Kirkland, WA 98034
- Reassigned Medicare billing, Washington enrollment
- 61 clinicians in this Medicare group
Bradenton, FL 34208
- Reassigned Medicare billing, Washington enrollment
- 56 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Washington Medical Ctr
Acute Care Hospitals · Seattle, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98195 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
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 Elaine Mast's NPI number?
The NPI number for Elaine Mast is 1609231430. It was assigned to this individual provider in the NPPES registry on December 21, 2015.
Where is Elaine Mast located?
Elaine Mast practices at 1959 NE Pacific St, Seattle, WA 98195. The listed phone number is (206) 598-4260.
What is Elaine Mast's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Elaine Mast enrolled in Medicare?
Yes. Elaine Mast 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 Elaine Mast's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Elaine Mast reassigns Medicare benefits to 4 organizations: Kaiser Foundation Health Plan Of Washington (Seattle, WA), The Association Of University Physicians (Seattle, WA), Lake Washington Anesthesia PLLC (Kirkland, WA) and Anesthesia Dynamics LLC (Bradenton, FL). 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 Elaine Mast's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Elaine Mast accept?
Health plans from Premera Blue Cross Blue Shield of Alaska list Elaine Mast 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 Elaine Mast affiliated with any hospitals?
According to CMS data, Elaine Mast is affiliated with University Of Washington Medical Ctr.
When was this NPI record last updated?
The NPPES record for Elaine Mast was last updated on April 7, 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.
# Elaine Mast · NPI 1609231430
Nurse Anesthetist, Certified Registered physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since December 21, 2015.
## Identity
- **NPI:** 1609231430 (Entity type: Individual)
- **Enumerated:** December 21, 2015
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** AP60621373 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1959 NE PACIFIC ST, Seattle, WA 98195-6152
- **Phone:** (206) 598-4260
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Kaiser Foundation Health Plan Of Washington (NPI 1396810701, Seattle, WA); The Association Of University Physicians (NPI 1023041159, Seattle, WA); Lake Washington Anesthesia PLLC (NPI 1962935197, Kirkland, WA); Anesthesia Dynamics LLC (NPI 1073001012, Bradenton, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** April 7, 2021
- **Other identifiers:** Medicaid 1609231430 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1609231430) · Data from the CMS NPPES public registry.