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

DR. JOHN FRANCIS BRENNAN MD
NPI 1891378345
Pathology - Molecular Genetic Pathology in Charleston, SC

Q: What is John Brennan's NPI number?

The NPI number for John Brennan is 1891378345. It was assigned to this individual provider in the NPPES registry on May 3, 2021.

Q: What is John Brennan's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Molecular Genetic Pathology, with taxonomy code 207ZP0007X.

Q: When was this NPI record last updated?

The NPPES record for John Brennan was last updated on September 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 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 May 03, 2021

171 ASHLEY AVE, CHARLESTON, SC 29425(843) 792-1414 Get Directions Write a Review

NPPES record last updated: September 9, 2026. Verified against the NPPES registry weekly; last sync: September 27, 2026.

Record update history: Sep 9, 2026, Apr 8, 2025, May 3, 2021 (3 updates tracked since 2021).

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About Dr. John Francis Brennan Md NPPES

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

DR. JOHN FRANCIS BRENNAN MD (NPI 1891378345) is an individual molecular genetic pathology provider in Charleston, South Carolina, licensed in South Carolina (98066) and active in the NPI registry since May 2021. He maintains 2 additional practice locations.

NPPES Registry Identity

NPI1891378345

Entity TypeIndividualMale

Primary Taxonomy207ZP0007X

Provider Legal NameDR. JOHN FRANCIS BRENNANCredential: MD

Location Address171 ASHLEY AVECharleston, SC 29425-0100

Mailing AddressPo Box 751461Charlotte, NC 28275-1461 · (843) 792-1414

Phone(843) 792-1414

Sole ProprietorNo

Enumeration DateMay 3, 2021

Last NPPES UpdateSeptember 9, 20263 updates tracked since enumeration

NPPES CertifiedSeptember 9, 2026

✔ NPI 1891378345 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPathology · Molecular Genetic PathologyAllopathic & Osteopathic Physicians

Taxonomy Code207ZP0007X

Licenses✔ Licensed in SC · 98066✔ Licensed in UT · 14211788-1205

Definition

A molecular genetic pathologist is expert in the principles, theory and technologies of molecular biology and molecular genetics. This expertise is used to make or confirm diagnoses of Mendelian genetic disorders, disorders of human development, infectious diseases and malignancies, and to assess the natural history of those disorders. A molecular genetic pathologist provides information about gene structure, function and alteration and applies laboratory techniques for diagnosis, treatment and prognosis for individuals with related disorders.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License 304865 (NC)

171 ASHLEY AVE, Charleston, SC 29425

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Secondary Practice Locations 2

Location 115 N Medical DrSalt Lake City, UT 84112-1100 · Phone (801) 581-2121

Location 2321 S Columbia StChapel Hill, NC 27514-4309 · Phone (919) 966-4676

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.

CAROLYN REED WORD M.D.

Allergy & Immunology