Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

DR. GREGORY WALTER GUYMAN DDS, MSD
NPI 1245138171
Dentist - Orthodontics and Dentofacial Orthopedics in Mercer Island, WA

Active since October 29, 2026
6203 SE 30TH ST, MERCER ISLAND, WA 98040(206) 919-2514 Get Directions Write a Review

NPPES record added: October 29, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Gregory Walter Guyman Dds, Msd NPPES

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

DR. GREGORY WALTER GUYMAN DDS, MSD (NPI 1245138171) is an individual orthodontics and dentofacial orthopedics provider in Mercer Island, Washington, licensed in Washington (4741) and active in the NPI registry since October 2026.

NPPES Registry Identity

NPI1245138171
Entity TypeIndividualMale
Primary Taxonomy1223X0400X
Provider Legal NameDR. GREGORY WALTER GUYMANCredential: DDS, MSD
Location Address6203 SE 30TH STMercer Island, WA 98040-2413
Mailing Address6203 Se 30th StMercer Island, WA 98040-2413 · (206) 919-2514
Sole ProprietorYes
Enumeration DateOctober 29, 2026
NPPES CertifiedOctober 29, 2026
✔ NPI 1245138171 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · Orthodontics and Dentofacial OrthopedicsDental Providers
Taxonomy Code1223X0400X
License✔ Licensed in WA · 4741
Definition
That area of dentistry concerned with the supervision, guidance and correction of the growing or mature dentofacial structures, including those conditions that require movement of teeth or correction of malrelationships and malformations of their related structures and the adjustment of relationships between and among teeth and facial bones by the application of forces and/or the stimulation and redirection of functional forces within the craniofacial complex. Major responsibilities of orthodontic practice include the diagnosis, prevention, interception and treatment of all forms of malocclusion of the teeth and associated alterations in their surrounding structures; the design, application and control of functional and corrective appliances; and the guidance of the dentition and its supporting structures to attain and maintain optimum occlusal relations in physiologic and esthetic harmony among facial and cranial structures.
6203 SE 30TH ST, Mercer Island, WA 98040

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 Guyman's NPI number?

The NPI number for Gregory Guyman is 1245138171. It was assigned to this individual provider in the NPPES registry on October 29, 2026.

Where is Gregory Guyman located?

Gregory Guyman practices at 6203 SE 30th St, Mercer Island, WA 98040. The listed phone number is (206) 919-2514.

What is Gregory Guyman's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Orthodontics and Dentofacial Orthopedics, with taxonomy code 1223X0400X.

When was this NPI record last updated?

The NPPES record for Gregory Guyman was last updated on October 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 days 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.