ZACHARY CHARLES MATTES M.D.
NPI 1841644432
Hospitalist in Seattle, WA
About Zachary Charles Mattes M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ZACHARY CHARLES MATTES M.D. (NPI 1841644432) is an individual hospitalist provider in Seattle, Washington, licensed in Washington (MD60974864) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS, is affiliated with St Joseph Medical Center, and maintains a secondary practice location in Seattle.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 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
Zachary Charles Mattes 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 Reassignments
3Medicare enrollment records show Zachary Mattes reassigns Medicare billing to 3 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
- Also billed through NPI 1720023641 (Washington)
- 38 clinicians in this Medicare group
Seattle, WA 98101
- Reassigned Medicare billing, Washington enrollment
- 1,021 clinicians in this Medicare group
Bremerton, WA 98310
- Reassigned Medicare billing, Washington enrollment
- 1,526 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Joseph Medical Center
Acute Care Hospitals · Tacoma, WASt Francis Community Hospital
Acute Care Hospitals · Federal Way, 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.
Referred Medical Equipment & Supplies CMS DME claims
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 98104
SEATTLE, WA 98104
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 Zachary Mattes's NPI number?
The NPI number for Zachary Mattes is 1841644432. It was assigned to this individual provider in the NPPES registry on April 20, 2016.
Where is Zachary Mattes located?
Zachary Mattes practices at 1101 Madison St Ste 301, Seattle, WA 98104. The listed phone number is (206) 505-1300.
What is Zachary Mattes's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Zachary Mattes enrolled in Medicare?
Yes. Zachary Mattes 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 Zachary Mattes's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Mattes reassigns Medicare benefits to 3 organizations: Pacmed Clinics (Seattle, WA), Virginia Mason Medical Center (Seattle, WA) and Franciscan Medical Group (Bremerton, WA). 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 Zachary Mattes's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Zachary Mattes accept?
Health plans from Premera Blue Cross Blue Shield of Alaska list Zachary Mattes 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 Zachary Mattes affiliated with any hospitals?
According to CMS data, Zachary Mattes is affiliated with St Joseph Medical Center and St Francis Community Hospital.
When was this NPI record last updated?
The NPPES record for Zachary Mattes was last updated on June 17, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Zachary Charles Mattes, M.D. · NPI 1841644432
Hospitalist physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since April 20, 2016.
## Identity
- **NPI:** 1841644432 (Entity type: Individual)
- **Enumerated:** April 20, 2016
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** MD60974864 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1101 MADISON ST STE 301, Seattle, WA 98104-3599
- **Phone:** (206) 505-1300
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Pacmed Clinics (NPI 1437202249, Seattle, WA); Virginia Mason Medical Center (NPI 1780748657, Seattle, WA); Franciscan Medical Group (NPI 1154564649, Bremerton, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Saint Louis University School Of Medicine, class of 2016
## Record status
- **NPPES last updated:** June 17, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1841644432) · Data from the CMS NPPES public registry.