Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Duncan Alexander Gillies II, M.D.

Preventive Medicine/Occupational Environmental Medicine Physician in Fort Sam Houston, TX · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1659395879

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Registry record

Entity type Individual (Type 1)

Name Dr. Duncan Alexander Gillies II

Credential M.D.

Sex Male

Practice address Fort Sam Houston, TX, 78234

Phone (210) 221-7952

Enumeration date Jul 27, 2006

Last updated in NPPES Feb 6, 2020

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 01057448A (IN) Secondary

2083P0901X Public Health & General Preventive Medicine Physician Allopathic & Osteopathic Physicians · License 01057448A (IN) Secondary

2083P0500X Preventive Medicine/Occupational Environmental Medicine Physician Allopathic & Osteopathic Physicians · License 01057448A (IN) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Where does Duncan Gillies practice?

The practice location on file with NPPES is in Fort Sam Houston, TX. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Duncan Gillies?

The National Provider Identifier (NPI) for Duncan Gillies is 1659395879, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Lan-Anh Ngo Family Medicine Physician · Jbsa Ft Sam Houston, TX NPI 1114922903 Lori Thelen Family Medicine Physician · Fort Sam Houston, TX NPI 1285633966 Cynthia Jones Occupational Therapist · Fort Sam Houston, TX NPI 1275532723 John Pena Medical Physician Assistant · Fort Sam Houston, TX NPI 1700885373 Denise Fricchione Medical Physician Assistant · Fort Sam Houston, TX NPI 1285633511 Kathryn Joyce Family Nurse Practitioner · Fort Sam Houston, TX NPI 1235139494 Barry Steever Adult Health Nurse Practitioner · San Antonio, TX NPI 1568463099 Kyle Friedman Anesthesiology Physician · Fort Sam Houston, TX NPI 1053303206

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-02-06.