DR. CHARLES JACOB MAYER MD
NPI 1487739298
Family Medicine in Seattle, WA
About Dr. Charles Jacob Mayer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CHARLES JACOB MAYER MD (NPI 1487739298) is an individual family medicine provider in Seattle, Washington, licensed in Washington (MD00031331) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Seattle, and is a graduate of Howard University College Of Medicine (1991).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 2
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. Charles Jacob Mayer 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
3Medicare enrollment records show Charles Mayer reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Seattle, WA 98109
- Reassigned Medicare billing, Washington enrollment
- 2,678 clinicians in this Medicare group
Vancouver, WA 98686
- Reassigned Medicare billing, Washington and Oregon enrollments
- Medicare enrollment name: Kaiser Foundation Health Plan Of The Northwest
- Also billed through NPI 1093043424 (Oregon)
- 2,534 clinicians in this Medicare group
Denver, CO 80247
- Reassigned Medicare billing, Colorado enrollment
- Medicare enrollment name: Colorado Permanente Medical Group PC
- 1,715 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 98101 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 9
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 Charles Mayer's NPI number?
The NPI number for Charles Mayer is 1487739298. It was assigned to this individual provider in the NPPES registry on October 27, 2006.
Where is Charles Mayer located?
Charles Mayer practices at 1420 5th Ave Ste 375, Seattle, WA 98101. The listed phone number is (206) 223-2611.
What is Charles Mayer's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Charles Mayer enrolled in Medicare?
Yes. Charles Mayer 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 Charles Mayer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Charles Mayer reassigns Medicare benefits to 3 organizations: Kaiser Foundation Health Plan Of Washington (Seattle, WA), Manor Care Of Salmon Creek Wa, Association (Vancouver, WA) and Colorado Permanente Medical Group, P.C. (Denver, CO). 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 Charles Mayer'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 Charles Mayer was last updated on April 14, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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. Charles Jacob Mayer, MD · NPI 1487739298
Family Medicine physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since October 27, 2006.
## Identity
- **NPI:** 1487739298 (Entity type: Individual)
- **Enumerated:** October 27, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** MD00031331 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1420 5TH AVE STE 375, Seattle, WA 98101-4032
- **Phone:** (206) 223-2611
## 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): Kaiser Foundation Health Plan Of Washington (NPI 1396810701, Seattle, WA); Manor Care Of Salmon Creek Wa, Association (NPI 1609171081, Vancouver, WA); Colorado Permanente Medical Group, P.C. (NPI 1760599724, Denver, CO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Howard University College Of Medicine, class of 1991
## Record status
- **NPPES last updated:** April 14, 2022
- **Other identifiers:** Medicaid 8182313 (WA); Other 2000015
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Source: [NPI Profile](https://npiprofile.com/npi/1487739298) · Data from the CMS NPPES public registry.