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

Dr. Gregory Maddox, MD

Individual provider Family Medicine Physician · NPI 1114212347

Dr. Gregory Maddox, MD is registered under Family Practice in Seattle, Washington. Graduated from Js Weill Medical College, Cornell University in 2011, 15 years ago. Practices with Overlake Medical Clinics LLC, a 426-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Washington.

Years since qualifying
15
Trained at
Js Weill Medical College, Cornell University
Licensed in
WA
In the registry since
2011
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

550 16th Ave Ste 400
Seattle, WA 98122-5699 Not confirmed with CMS for 15 years — call before visiting
Phone: (206) 324-8484
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence ML60224904 (WA)

Record details

NPI number1114212347
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 15, 2011
Last updated in NPPESJune 15, 2011

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolJS WEILL MEDICAL COLLEGE, CORNELL UNIVERSITY
Graduated 2011 (15 years in practice)
Group practice Overlake Medical Clinics Llc — 426 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 1–10 times
Removal or shaving of skin growth 1–10 times
Skin biopsy 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients223
Services billed 864 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Overlake Hospital Medical Center & Clinics Hospital · Bellevue, WA · listed as Overlake Hospital Medical Center
  • Swedish Issaquah Hospital · Issaquah, WA
  • Evergreenhealth Home Care Services Home health agency · Kirkland, WA

Colleagues at Overlake Medical Clinics LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 426 clinicians in the practice; 12 are shown here.

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