Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Charles Jacob Mayer, MD

Individual provider Family Medicine Physician · NPI 1487739298

Dr. Charles Jacob Mayer, MD is registered under Family Practice in Seattle, Washington. Graduated from Howard University College of Medicine in 1991, 35 years ago. Practices with Kaiser Foundation Health Plan of Washington, a 1,519-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Colorado and Washington.

Years since qualifying
35
Trained at
Howard University College of Medicine
Licensed in
CO, WA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1420 5th Ave Ste 375
Seattle, WA 98101-4032
Phone: (206) 223-2611
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • University Of Washington Medical Ctr, Seattle, WA 98195-0001 — (206) 598-4055

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MD00031331 (WA)
Family Medicine Physician Taxonomy 207Q00000X · Licence DR.0067844 (CO)

Record details

NPI number1487739298
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 27, 2006
Last updated in NPPESApril 14, 2022
Certification dateApril 14, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolHOWARD UNIVERSITY COLLEGE OF MEDICINE
Graduated 1991 (35 years in practice)
Group practice Kaiser Foundation Health Plan Of Washington — 1519 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients16
Services billed 17 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Kaiser Foundation Health Plan of Washington

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1519 clinicians in the practice; 12 are shown here.

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