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

Dr. John James Hollowed Jr., MD

Interventional Cardiology Physician in Laguna Hills, CA · enumerated 2014.

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

National Provider Identifier

1891115572

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. John James Hollowed Jr.

Credential MD

Sex Male

Practice address Laguna Hills, CA, 92653

Phone (714) 389-1843

Fax (714) 445-0245

Enumeration date Apr 22, 2014

Last updated in NPPES May 18, 2026

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

Taxonomy & licenses

207RI0011X Interventional Cardiology Physician Allopathic & Osteopathic Physicians · License A142140 (CA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
1700821691	Other	CA	PACIFIC CARDIOVASCULAR ASSOCIATES

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

What specialty is John Hollowed?

John Hollowed is registered in NPPES with the primary taxonomy of Interventional Cardiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

George Tadros Interventional Cardiology Physician · Laguna Hills, CA NPI 1588623144 Khyati Pandya Pediatric Cardiology Physician · Laguna Hills, CA NPI 1982803524 Cheng-Han Chen Interventional Cardiology Physician · Laguna Hills, CA NPI 1215181722 Christopher Chen Clinical Cardiac Electrophysiology Physician · Laguna Hills, CA NPI 1700312840

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-18.