MR. BRENDAN THOMAS MULLEN MD
NPI 1235657313
Internal Medicine - Infectious Disease in Seattle, WA
About Mr. Brendan Thomas Mullen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. BRENDAN THOMAS MULLEN MD (NPI 1235657313) is an individual infectious disease provider in Seattle, Washington, licensed in Washington (MD.MD.60482538) and active in the NPI registry since September 2017. He is enrolled in Medicare PECOS and is a graduate of Other (2021).
NPPES Registry Identity
Specialties & Licenses
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
Mr. Brendan Thomas Mullen 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 Brendan Mullen 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.
Physician 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.
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 Brendan Mullen's NPI number?
The NPI number for Brendan Mullen is 1235657313. It was assigned to this individual provider in the NPPES registry on September 8, 2017.
Where is Brendan Mullen located?
Brendan Mullen practices at 325 9th Ave, Seattle, WA 98104. The listed phone number is (206) 520-5000.
What is Brendan Mullen's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Brendan Mullen enrolled in Medicare?
Yes. Brendan Mullen 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 Brendan Mullen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Brendan Mullen 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 Brendan Mullen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Brendan Mullen accept?
Health plans from Premera Blue Cross Blue Shield of Alaska list Brendan Mullen 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.
When was this NPI record last updated?
The NPPES record for Brendan Mullen was last updated on July 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.
# Mr. Brendan Thomas Mullen, MD · NPI 1235657313
Infectious Disease physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since September 8, 2017.
## Identity
- **NPI:** 1235657313 (Entity type: Individual)
- **Enumerated:** September 8, 2017
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** MD.MD.60482538 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 325 9TH AVE, Seattle, WA 98104-2420
- **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:** The Association Of University Physicians (NPI 1023041159, Seattle, WA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** July 7, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1235657313) · Data from the CMS NPPES public registry.