WILLIAM LOU MD
NPI 1710340161
Psychiatry & Neurology - Vascular Neurology in Seattle, WA
About William Lou Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM LOU MD (NPI 1710340161) is an individual vascular neurology provider in Seattle, Washington, licensed in Washington (MD61087268) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS, is affiliated with Swedish Medical Center / Cherry Hill, and is a graduate of Other (2016).
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
William Lou 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
9Medicare enrollment records show William Lou reassigns Medicare billing to 9 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
- 1,270 clinicians in this Medicare group
Mill Creek, WA 98012
- Reassigned Medicare billing, Washington enrollment
- 705 clinicians in this Medicare group
Olympia, WA 98506
- Reassigned Medicare billing, Washington enrollment
- 646 clinicians in this Medicare group
Longview, WA 98632
- Reassigned Medicare billing, Washington enrollment
- 77 clinicians in this Medicare group
Colville, WA 99114
- Reassigned Medicare billing, Washington enrollment
- 862 clinicians in this Medicare group
College Place, WA 99324
- Reassigned Medicare billing, Washington enrollment
- 276 clinicians in this Medicare group
Missoula, MT 59802
- Reassigned Medicare billing, Washington enrollment
- 51 clinicians in this Medicare group
Torrance, CA 90503
- Reassigned Medicare billing, Washington enrollment
- 60 clinicians in this Medicare group
Anchorage, AK 99508
- Reassigned Medicare billing, Washington enrollment
- 62 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 5
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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Swedish Medical Center / Cherry Hill
Acute Care Hospitals · Seattle, WASwedish Edmonds Hospital
Acute Care Hospitals · Edmonds, WASwedish Medical Center
Acute Care Hospitals · Seattle, WASwedish Issaquah
Acute Care Hospitals · Issaquah, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98122 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.
SEATTLE, WA 98122
SEATTLE, WA 98122
SEATTLE, WA 98122
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 Lou's NPI number?
The NPI number for William Lou is 1710340161. It was assigned to this individual provider in the NPPES registry on April 2, 2016.
Where is William Lou located?
William Lou practices at 550 17th Ave, Seattle, WA 98122. The listed phone number is (206) 320-2800.
What is William Lou's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Vascular Neurology, with taxonomy code 2084V0102X.
Is William Lou enrolled in Medicare?
Yes. William Lou 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 William Lou's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Lou reassigns Medicare benefits to 9 organizations: Swedish Health Services (Seattle, WA), Providence Health & Services- Washington (Mill Creek, WA), Providence Health & Services Washington (Olympia, WA), Providence Health & Services Oregon (Longview, WA), Providence Health & Services Washington (Colville, WA) and 4 more organizations, listed in the Medicare section above. 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 William Lou's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Lou accept?
Health plans from Blue Cross and Blue Shield of Montana, Mountain Health CO-OP and Premera Blue Cross Blue Shield of Alaska list William Lou 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 Lou affiliated with any hospitals?
According to CMS data, William Lou is affiliated with Swedish Medical Center / Cherry Hill, Swedish Edmonds Hospital, Swedish Medical Center and Swedish Issaquah.
When was this NPI record last updated?
The NPPES record for William Lou was last updated on September 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 37 days 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.
# William Lou, MD · NPI 1710340161
Vascular Neurology physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since April 2, 2016.
## Identity
- **NPI:** 1710340161 (Entity type: Individual)
- **Enumerated:** April 2, 2016
- **Primary specialty:** Psychiatry & Neurology - Vascular Neurology · taxonomy 2084V0102X
- **State license:** MD61087268 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 550 17TH AVE, Seattle, WA 98122-5788
- **Phone:** (206) 320-2800 · **Fax:** (206) 320-2451
## 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:** 9 organizations under Medicare reassignment (form CMS-855R): Swedish Health Services (NPI 1689612954, Seattle, WA); Providence Health & Services- Washington (NPI 1790014504, Mill Creek, WA); Providence Health & Services Washington (NPI 1174744304, Olympia, WA); Providence Health & Services Oregon (NPI 1104097906, Longview, WA); Providence Health & Services Washington (NPI 1083968879, Colville, WA); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** September 17, 2026
- **Other identifiers:** Medicaid 2059759 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1710340161) · Data from the CMS NPPES public registry.