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

Dr. William Gourdin Mcmaster Jr., M.D.

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Columbia, SC · enumerated 2010 · practices at Palmetto Health University of South Carolina Medical Group.

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

National Provider Identifier

1124345574

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. William Gourdin Mcmaster Jr.

Credential M.D.

Sex Male

Practice address Columbia, SC, 29203

Phone (803) 795-0871

Fax (803) 765-9214

Enumeration date Apr 26, 2010

Last updated in NPPES Apr 13, 2023

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

Taxonomy & licenses

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 50674 (TN) Secondary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 89449 (SC) 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

How do I verify William Mcmaster's NPI record?

Cross-check NPI 1124345574 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1124345574 active?

Yes, as of the latest NPPES snapshot, NPI 1124345574 is active (record last updated 2023-04-13).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-04-13.