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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

WILLIAM YOUNG GUO MD
NPI 1942888482
Dermatology - MOHS-Micrographic Surgery in Stony Brook, NY

Active since March 29, 2021
1320 STONY BROOK RD BLDG F, STONY BROOK, NY 11790(631) 444-4200 Get Directions Write a Review

NPPES record last updated: July 9, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 9, 2026, Mar 29, 2021 (2 updates tracked since 2021).

About William Young Guo Md NPPES

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

WILLIAM YOUNG GUO MD (NPI 1942888482) is an individual mohs-micrographic surgery provider in Stony Brook, New York, licensed in New York (343125) and active in the NPI registry since March 2021.

NPPES Registry Identity

NPI1942888482
Entity TypeIndividualMale
Primary Taxonomy207ND0101X
Provider Legal NameWILLIAM YOUNG GUOCredential: MD
Location Address1320 STONY BROOK RD BLDG FStony Brook, NY 11790-2206
Mailing Address1320 Stony Brook Rd Bldg FStony Brook, NY 11790-2206 · (631) 444-4200
Phone(631) 444-4200
Sole ProprietorNo
Enumeration DateMarch 29, 2021
Last NPPES UpdateJuly 9, 20262 updates tracked since enumeration
NPPES CertifiedJuly 9, 2026
✔ NPI 1942888482 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyDermatology · MOHS-Micrographic SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207ND0101X
License✔ Licensed in NY · 343125
Definition
The highly-trained surgeons that perform Mohs Micrographic Surgery are specialists both in dermatology and pathology. With their extensive knowledge of the skin and unique pathological skills, they are able to remove only diseased tissue, preserving healthy tissue and minimizing the cosmetic impact of the surgery. Mohs surgeons who belong to the American College of Mohs Surgery (ACMS) have completed a minimum of one year of fellowship training at one of the ACMS-approved training centers in the U.S.
Also ListedDermatologyTaxonomy 207N00000X · License 343125 (NY)
1320 STONY BROOK RD BLDG F, Stony Brook, NY 11790
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Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. RACHEL MANCI MD
Dermatology
1320 STONY BROOK RD BLDG F
STONY BROOK, NY 11790
Suffolk County (631) 444-4200
KIMBERLY W LU
Student in an Organized Health Care Education/Training Program
1320 STONY BROOK RD BLDG F
STONY BROOK, NY 11790
Suffolk County (631) 444-4200

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 William Guo's NPI number?

The NPI number for William Guo is 1942888482. It was assigned to this individual provider in the NPPES registry on March 29, 2021.

Where is William Guo located?

William Guo practices at 1320 Stony Brook Rd Bldg F, Stony Brook, NY 11790. The listed phone number is (631) 444-4200.

What is William Guo's specialty?

The primary specialty registered for this NPI is Dermatology, specializing in MOHS-Micrographic Surgery, with taxonomy code 207ND0101X.

When was this NPI record last updated?

The NPPES record for William Guo was last updated on July 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 27 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.