Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Hugh Trent Mackay, M.D.

Q: What is the NPI number for Hugh Mackay?

The National Provider Identifier (NPI) for Hugh Mackay is 1346232261, a Type 1 (individual) record in the CMS NPPES registry.

Obstetrics & Gynecology Physician in Bethesda, MD · enumerated 2005.

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

National Provider Identifier

1346232261

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Registry record

Entity type Individual (Type 1)

Name Dr. Hugh Trent Mackay

Credential M.D.

Sex Male

Practice address 8901 Wisconsin Ave., Dept. of Obstetrics and Gynecology, Bethesda, MD, 20889

Phone (301) 295-1128

Fax (301) 295-0674

Enumeration date Aug 17, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 037858 (GA) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Hugh Mackay practice?

The practice location on file with NPPES is in Bethesda, MD. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Hugh Mackay?

The National Provider Identifier (NPI) for Hugh Mackay is 1346232261, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.