DR. KAREN G WILLIAMS DO, MPH
NPI 1821436072
Hospitalist in Seattle, WA
About Dr. Karen G Williams Do, Mph NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KAREN G WILLIAMS DO, MPH (NPI 1821436072) is an individual hospitalist provider in Seattle, Washington, licensed in Washington (DO.OP.61193845) and active in the NPI registry since June 2013. She is enrolled in Medicare PECOS, is affiliated with Swedish Medical Center / Cherry Hill, and maintains a secondary practice location in Fort Defiance.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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. Karen G Williams Do, Mph 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
2Medicare enrollment records show Karen Williams reassigns Medicare billing to 2 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
Fort Defiance, AZ 86504
- Reassigned Medicare billing, Texas enrollment
- 518 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 6
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 2
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 Medical Center
Acute Care Hospitals · Seattle, 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.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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
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 Karen Williams's NPI number?
The NPI number for Karen Williams is 1821436072. It was assigned to this individual provider in the NPPES registry on June 10, 2013.
Where is Karen Williams located?
Karen Williams practices at 747 Broadway, Seattle, WA 98122. The listed phone number is (206) 215-2520.
What is Karen Williams's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Karen Williams enrolled in Medicare?
Yes. Karen Williams 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 Karen Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Williams reassigns Medicare benefits to 2 organizations: Swedish Health Services (Seattle, WA) and The Fort Defiance Indian Hospital Board, Incorporation (Fort Defiance, AZ). 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 Karen Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karen Williams accept?
Health plans from Premera Blue Cross Blue Shield of Alaska list Karen Williams 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 Karen Williams affiliated with any hospitals?
According to CMS data, Karen Williams is affiliated with Swedish Medical Center / Cherry Hill and Swedish Medical Center.
When was this NPI record last updated?
The NPPES record for Karen Williams was last updated on June 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Dr. Karen G Williams, DO, MPH · NPI 1821436072
Hospitalist physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since June 10, 2013.
## Identity
- **NPI:** 1821436072 (Entity type: Individual)
- **Enumerated:** June 10, 2013
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** DO.OP.61193845 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 747 BROADWAY, Seattle, WA 98122-4379
- **Phone:** (206) 215-2520 · **Fax:** (206) 386-3180
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Swedish Health Services (NPI 1689612954, Seattle, WA); The Fort Defiance Indian Hospital Board, Incorporation (NPI 1477876639, Fort Defiance, AZ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** At Still University, Arizona School Of Dentistry & Oral Hlth, class of 2013
## Record status
- **NPPES last updated:** June 19, 2026
- **Other identifiers:** Medicaid 2196091 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1821436072) · Data from the CMS NPPES public registry.