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

John Howard Frierson, M.D.

Interventional Cardiology Physician in San Antonio, TX · enumerated 2005.

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

National Provider Identifier

1326021015

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name John Howard Frierson

Credential M.D.

Sex Male

Practice address San Antonio, TX, 78212

Phone (210) 271-7266

Fax (210) 226-8411

Enumeration date Nov 28, 2005

Last updated in NPPES Mar 29, 2022

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

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License G3371 (TX) Secondary

207RI0011X Interventional Cardiology Physician Allopathic & Osteopathic Physicians · License G3371 (TX) Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License G3371 (TX) Secondary

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 John Frierson practice?

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

What is the NPI number for John Frierson?

The National Provider Identifier (NPI) for John Frierson is 1326021015, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-03-29.