AYNSLEY WELSH DUNCAN MD
NPI 1548623994
Internal Medicine in Seattle, WA
About Aynsley Welsh Duncan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
AYNSLEY WELSH DUNCAN MD (NPI 1548623994) is an individual internal medicine provider in Seattle, Washington, licensed in Washington (60871370) and active in the NPI registry since April 2016. She is enrolled in Medicare PECOS, is affiliated with Harborview Medical Center, and is a graduate of Js Weill Medical College, Cornell University (2016).
NPPES Registry Identity
Specialties & Licenses 2
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
Aynsley Welsh Duncan 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 Aynsley Duncan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Seattle, WA 98104
- Reassigned Medicare billing, Washington enrollment
- 4,364 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.
Harborview Medical Center
Acute Care Hospitals · Seattle, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98104 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.
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 Aynsley Duncan's NPI number?
The NPI number for Aynsley Duncan is 1548623994. It was assigned to this individual provider in the NPPES registry on April 2, 2016.
Where is Aynsley Duncan located?
Aynsley Duncan practices at 325 9th Ave Box 359892, Seattle, WA 98104. The listed phone number is (206) 744-5865.
What is Aynsley Duncan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Aynsley Duncan enrolled in Medicare?
Yes. Aynsley Duncan 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 Aynsley Duncan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Aynsley Duncan reassigns Medicare benefits to The Association Of University Physicians (Seattle, WA). 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 Aynsley Duncan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Aynsley Duncan accept?
Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Aynsley Duncan 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 Aynsley Duncan affiliated with any hospitals?
According to CMS data, Aynsley Duncan is affiliated with Harborview Medical Center.
When was this NPI record last updated?
The NPPES record for Aynsley Duncan was last updated on June 25, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Aynsley Welsh Duncan, MD · NPI 1548623994
Internal Medicine physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since April 2, 2016.
## Identity
- **NPI:** 1548623994 (Entity type: Individual)
- **Enumerated:** April 2, 2016
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 60871370 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 325 9TH AVE, BOX 359892, Seattle, WA 98104-2420
- **Phone:** (206) 744-5865
## 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:** The Association Of University Physicians (NPI 1023041159, Seattle, WA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Js Weill Medical College, Cornell University, class of 2016
## Record status
- **NPPES last updated:** June 25, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1548623994) · Data from the CMS NPPES public registry.