DR. PATRICK LEROY MATHIASEN MD
NPI 1316962145
Psychiatry & Neurology - Psychiatry in Bellevue, WA
About Dr. Patrick Leroy Mathiasen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. PATRICK LEROY MATHIASEN MD (NPI 1316962145) is an individual psychiatry provider in Bellevue, Washington, licensed in Washington (MD00025427) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Minnesota, Duluth School Of Medicine (1985).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 4
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. Patrick Leroy Mathiasen 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
4Medicare enrollment records show Patrick Mathiasen reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Bellevue, WA 98004
- Reassigned Medicare billing, Washington enrollment
- 566 clinicians in this Medicare group
Kirkland, WA 98034
- Reassigned Medicare billing, Washington enrollment
- 64 clinicians in this Medicare group
Houston, TX 77070
- Reassigned Medicare billing, Nevada and Washington enrollments
- 52 clinicians in this Medicare group
Houston, TX 77070
- Reassigned Medicare billing, Nevada and Washington enrollments
- 51 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 3
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98004 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Patrick Mathiasen's NPI number?
The NPI number for Patrick Mathiasen is 1316962145. It was assigned to this individual provider in the NPPES registry on July 13, 2006.
Where is Patrick Mathiasen located?
Patrick Mathiasen practices at 1035 116th Ave NE, Bellevue, WA 98004. The listed phone number is (206) 722-0594.
What is Patrick Mathiasen's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.
Is Patrick Mathiasen enrolled in Medicare?
Yes. Patrick Mathiasen 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 Patrick Mathiasen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Patrick Mathiasen reassigns Medicare benefits to 4 organizations: Overlake Medical Clinics, LLC (Bellevue, WA), Bhc Fairfax Hospital Inc. (Kirkland, WA), Psychiatry Of Texas PLLC (Houston, TX) and Psychplus Medical Associates, PLLC (Houston, TX). 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 Patrick Mathiasen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Patrick Mathiasen was last updated on May 30, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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. Patrick Leroy Mathiasen, MD · NPI 1316962145
Psychiatry physician in Bellevue, Washington. Individual provider, active in the CMS NPPES registry since July 13, 2006.
## Identity
- **NPI:** 1316962145 (Entity type: Individual)
- **Enumerated:** July 13, 2006
- **Primary specialty:** Psychiatry & Neurology - Psychiatry · taxonomy 2084P0800X
- **State license:** MD00025427 (Washington)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1035 116TH AVE NE, Bellevue, WA 98004-4604
- **Phone:** (206) 722-0594 · **Fax:** (206) 722-4484
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Overlake Medical Clinics, LLC (NPI 1801828421, Bellevue, WA); Bhc Fairfax Hospital Inc. (NPI 1104959097, Kirkland, WA); Psychiatry Of Texas PLLC (NPI 1013476027, Houston, TX); Psychplus Medical Associates, PLLC (NPI 1558118026, Houston, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Minnesota, Duluth School Of Medicine, class of 1985
## Record status
- **NPPES last updated:** May 30, 2013
- **Other identifiers:** Other BM1556109 (WA); Medicare ID-Type Unspecified MA9488 (WA); Medicaid 1056142 (WA); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1316962145) · Data from the CMS NPPES public registry.