DR. WILLIAM ORLANDO HAHN M.D.
NPI 1164650347
Internal Medicine - Infectious Disease in Seattle, WA
About Dr. William Orlando Hahn M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM ORLANDO HAHN M.D. (NPI 1164650347) is an individual infectious disease provider in Seattle, Washington, licensed in Washington (MD60332434) and active in the NPI registry since June 2009. He is enrolled in Medicare PECOS, is affiliated with University Of Washington Medical Ctr, and is a graduate of Other (2009).
NPPES Registry Identity
Specialties & Licenses 2
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
Dr. William Orlando Hahn M.d. 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 William Hahn 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 2
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, WAHarborview 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.
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 William Hahn's NPI number?
The NPI number for William Hahn is 1164650347. It was assigned to this individual provider in the NPPES registry on June 26, 2009.
Where is William Hahn located?
William Hahn practices at 325 9th Ave, Seattle, WA 98104. The listed phone number is (206) 520-5000.
What is William Hahn's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is William Hahn enrolled in Medicare?
Yes. William Hahn 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 William Hahn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Hahn 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 William Hahn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Hahn accept?
Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list William Hahn 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 William Hahn affiliated with any hospitals?
According to CMS data, William Hahn is affiliated with University Of Washington Medical Ctr and Harborview Medical Center.
When was this NPI record last updated?
The NPPES record for William Hahn was last updated on November 1, 2021. 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.
# Dr. William Orlando Hahn, M.D. · NPI 1164650347
Infectious Disease physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since June 26, 2009.
## Identity
- **NPI:** 1164650347 (Entity type: Individual)
- **Enumerated:** June 26, 2009
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** MD60332434 (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 2009
## Record status
- **NPPES last updated:** November 1, 2021
- **Other identifiers:** Medicaid 1164650347 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1164650347) · Data from the CMS NPPES public registry.