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DR. GREGORY MADDOX M.D.
NPI 1114212347
Family Medicine in Seattle, WA

Active since June 15, 2011PECOS EnrolledAccepts Medicare Assignment
550 16TH AVE, SUITE 400, SEATTLE, WA 98122(206) 324-8484 Get Directions Write a Review

NPPES record last updated: June 15, 2011. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Gregory Maddox M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GREGORY MADDOX M.D. (NPI 1114212347) is an individual family medicine provider in Seattle, Washington, licensed in Washington (ML60224904) and active in the NPI registry since June 2011. He is enrolled in Medicare PECOS, is affiliated with Overlake Hospital Medical Center, and is a graduate of Js Weill Medical College, Cornell University (2011).

NPPES Registry Identity

NPI1114212347
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDR. GREGORY MADDOXCredential: M.D.
Location Address550 16TH AVE, SUITE 400Seattle, WA 98122-5699
Mailing Address550 16th Ave, Suite 400Seattle, WA 98122-5699 · (917) 733-6740
Phone(206) 324-8484
Sole ProprietorNo
Medical School CMSJs Weill Medical College, Cornell UniversityGraduated 2011
Enumeration DateJune 15, 2011
✔ NPI 1114212347 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in WA · ML60224904
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
550 16TH AVE, Seattle, WA 98122
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include PacificSource Health Plans, Premera Blue Cross Blue Shield of Alaska, Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Gregory Maddox M.d. 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.

PECOS PAC ID4688892110
PECOS Enrollment IDI20140826000539
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 11

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
209 services127 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
129 services129 patients
Insertion of needle into vein for collection of blood sample 36415
This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.
71 services67 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
71 services56 patients
Annual depression screening, 5 to 15 minutes G0444
An annual depression screening is a short, routine evaluation to check for signs of depression. It involves answering a series of questions about your feelings, thoughts, and behaviors. The process takes about 15 minutes and helps detect depression early for better management.
35 services35 patients
Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use 90677
The Pneumococcal Conjugate Vaccine (PCV20) is a shot given to protect against 20 types of bacteria that can cause serious infections like pneumonia and meningitis. It's administered through a muscle, usually in the arm. It's important for overall health.
29 services29 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Overlake Hospital Medical Center

Acute Care Hospitals · Bellevue, WA
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number500051
Location1035-116th Ave NEBellevue, WA 98004 · King County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98122 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$97.43 typical visit price
range $63.67 – $189.37
Typical copayment $24.35 (range $15.91 – $47.34)
Most-billed visit code 99203
Established Patient
$111.00 typical visit price
range $21.12 – $155.00
Typical copayment $27.75 (range $5.28 – $38.75)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
9 suppliers40 claims82 services$5.63 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

DR. RICHARD CRAIG GRIFFITHS M.D.
Anesthesiology
550 16TH AVE, SUITE 404
SEATTLE, WA 98122
King County (206) 329-0585
EMILY BROWN ASHBAUGH M.D.
Family Medicine
550 16TH AVE, SUITE 400
SEATTLE, WA 98122
King County (206) 320-2484
MIKAELA ALGER MD
Family Medicine
550 16TH AVE, #100
SEATTLE, WA 98122
King County (306) 324-8484
LABORATORY CORPORATION OF AMERICA
Clinical Medical Laboratory
550 16TH AVE, SUTIE 100A
SEATTLE, WA 98122
King County (206) 320-2238
DYNACARE NORTHWEST INC
Clinical Medical Laboratory
550 16TH AVE, STE 100
SEATTLE, WA 98122
King County (206) 320-2238
SWEDISH HEALTH SERVICES
General Acute Care Hospital
550 16TH AVE, SUITE 400
SEATTLE, WA 98122
King County (206) 320-2484
DR. THUY DAN THI DO MD
Family Medicine
550 16TH AVE, STE 100
SEATTLE, WA 98122
King County (206) 320-2233
ALLISON MAY TERBIETEN BA, MSW, LICSW
Social Worker (Clinical)
550 16TH AVE
SEATTLE, WA 98122
King County (206) 320-7070

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 Gregory Maddox's NPI number?

The NPI number for Gregory Maddox is 1114212347. It was assigned to this individual provider in the NPPES registry on June 15, 2011.

Where is Gregory Maddox located?

Gregory Maddox practices at 550 16th Ave Suite 400, Seattle, WA 98122. The listed phone number is (206) 324-8484.

What is Gregory Maddox's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Gregory Maddox enrolled in Medicare?

Yes. Gregory Maddox 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.

What insurance does Gregory Maddox accept?

Health plans from PacificSource Health Plans, Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Gregory Maddox 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.

Is Gregory Maddox affiliated with any hospitals?

According to CMS data, Gregory Maddox is affiliated with Overlake Hospital Medical Center.

When was this NPI record last updated?

The NPPES record for Gregory Maddox was last updated on June 15, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.