DR. WILLIAM KIMBALL MELLOR M.D.
NPI 1144200460
Family Medicine in Colfax, WA
About Dr. William Kimball Mellor M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM KIMBALL MELLOR M.D. (NPI 1144200460) is an individual family medicine provider in Colfax, Washington, licensed in Washington (MD00024848) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 4
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. William Kimball Mellor M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show William Mellor reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Colfax, WA 99111
- Reassigned Medicare billing, Washington enrollment
- 69 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 99111 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 3
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 15
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 William Mellor's NPI number?
The NPI number for William Mellor is 1144200460. It was assigned to this individual provider in the NPPES registry on January 20, 2006.
Where is William Mellor located?
William Mellor practices at 1210 W Fairview St, Colfax, WA 99111. The listed phone number is (509) 397-4717.
What is William Mellor's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is William Mellor enrolled in Medicare?
Yes. William Mellor is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for William Mellor's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Mellor reassigns Medicare benefits to Public Hospital District No 3 Of Whitman County (Colfax, WA). The 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 Mellor's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Mellor accept?
Health plans from Ambetter Health, Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list William Mellor 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 William Mellor was last updated on October 14, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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. William Kimball Mellor, M.D. · NPI 1144200460
Family Medicine physician in Colfax, Washington. Individual provider, active in the CMS NPPES registry since January 20, 2006.
## Identity
- **NPI:** 1144200460 (Entity type: Individual)
- **Enumerated:** January 20, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** MD00024848 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1210 W FAIRVIEW ST, Colfax, WA 99111-9552
- **Phone:** (509) 397-4717
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Public Hospital District No 3 Of Whitman County (NPI 1922009448, Colfax, WA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 14, 2008
- **Other identifiers:** Medicare UPIN B81617 (WA); Medicaid 1044718 (WA); Medicare NSC 0946290001 (WA); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1144200460) · Data from the CMS NPPES public registry.