TIFFANY LYNN MATHIAS FIELDER MD
NPI 1891144580
Pain Medicine - Pain Medicine in Everett, WA
About Tiffany Lynn Mathias Fielder Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TIFFANY LYNN MATHIAS FIELDER MD (NPI 1891144580) is an individual pain medicine provider in Everett, Washington, licensed in Washington (61496551) and active in the NPI registry since June 2016. She is enrolled in Medicare PECOS, maintains a secondary practice location in Perris, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses 3
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
Tiffany Lynn Mathias Fielder 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 Tiffany Mathias Fielder reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Everett, WA 98201
- Reassigned Medicare billing, Washington enrollment
- 1,285 clinicians in this Medicare group
Seattle, WA 98122
- Reassigned Medicare billing, Washington enrollment
- 911 clinicians in this Medicare group
Lancaster, CA 93534
- Reassigned Medicare billing, California enrollment
- 13,921 clinicians in this Medicare group
Perris, CA 92571
- Reassigned Medicare billing, California enrollment
- 2 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98201 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.
EVERETT, WA 98201
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 Tiffany Mathias Fielder's NPI number?
The NPI number for Tiffany Mathias Fielder is 1891144580. It was assigned to this individual provider in the NPPES registry on June 3, 2016.
Where is Tiffany Mathias Fielder located?
Tiffany Mathias Fielder practices at 4027 Hoyt Ave, Everett, WA 98201. The listed phone number is (206) 860-5414.
What is Tiffany Mathias Fielder's specialty?
The primary specialty registered for this NPI is Pain Medicine with taxonomy code 208VP0000X.
Is Tiffany Mathias Fielder enrolled in Medicare?
Yes. Tiffany Mathias Fielder 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 Tiffany Mathias Fielder's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Tiffany Mathias Fielder reassigns Medicare benefits to 4 organizations: Optum Care Washington PLLC (Everett, WA), The Polyclinic PLLC (Seattle, WA), Southern California Permanente Medical Group (Lancaster, CA) and Rapid Care Enterprises, Inc (Perris, CA). 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 Tiffany Mathias Fielder's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Tiffany Mathias Fielder accept?
Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Tiffany Mathias Fielder 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.
When was this NPI record last updated?
The NPPES record for Tiffany Mathias Fielder was last updated on October 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Tiffany Lynn Mathias Fielder, MD · NPI 1891144580
Pain Medicine physician in Everett, Washington. Individual provider, active in the CMS NPPES registry since June 3, 2016.
## Identity
- **NPI:** 1891144580 (Entity type: Individual)
- **Enumerated:** June 3, 2016
- **Primary specialty:** Pain Medicine - Pain Medicine · taxonomy 208VP0000X
- **State license:** 61496551 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 4027 HOYT AVE, Everett, WA 98201-4920
- **Phone:** (206) 860-5414
## 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): Optum Care Washington PLLC (NPI 1831186766, Everett, WA); The Polyclinic PLLC (NPI 1174594634, Seattle, WA); Southern California Permanente Medical Group (NPI 1982863783, Lancaster, CA); Rapid Care Enterprises, Inc (NPI 1023560604, Perris, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** October 7, 2026
- **Other identifiers:** Other A161559 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1891144580) · Data from the CMS NPPES public registry.