Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

GUY L FISH M.D.
NPI 1013955301
Internal Medicine in Boston, MA

Q: What is Guy Fish's NPI number?

The NPI number for Guy Fish is 1013955301. It was assigned to this individual provider in the NPPES registry on June 2, 2006.

Q: What is Guy Fish's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Guy Fish was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 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.

Active since June 02, 2006

222 BERKELEY STREET, 20TH FLOOR, FLETCHER SPAGHT, BOSTON, MA 02116(617) 247-6700 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Guy L Fish M.d. NPPES

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

GUY L FISH M.D. (NPI 1013955301) is an individual internal medicine provider in Boston, Massachusetts, licensed in Massachusetts (211667) and active in the NPI registry since June 2006.

NPPES Registry Identity

NPI1013955301

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameGUY L FISHCredential: M.D.

Location Address222 BERKELEY STREET, 20TH FLOOR, FLETCHER SPAGHTBoston, MA 02116

Mailing Address26 Shea RdCambridge, MA 02140-1218 · (617) 247-6700

Phone(617) 247-6700

Sole ProprietorNo

Enumeration DateJune 2, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1013955301 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in MA · 211667

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

222 BERKELEY STREET, 20TH FLOOR, Boston, MA 02116

Open in Google Maps ↗

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 Guy Fish's NPI number?

The NPI number for Guy Fish is 1013955301. It was assigned to this individual provider in the NPPES registry on June 2, 2006.

Where is Guy Fish located?

Guy Fish practices at 222 Berkeley Street, 20th Floor Fletcher Spaght, Boston, MA 02116. The listed phone number is (617) 247-6700.

What is Guy Fish's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for Guy Fish was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 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.