John HollowedMD
Interventional Cardiology·Simi Valley, CA
John Hollowed, MD is an Interventional Cardiology provider in Simi Valley, CA, as of July 2026.
- NPI1891115572
- Registered2014
- Class of2014
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Education
Education on record as of August 2026.
John Hollowed at a glance
- Provider
- John Hollowed
- Credential
- MD
- Specialty
- Interventional Cardiology
- Procedures
- Interventional Cardiology CPT codes
- Location
- Simi Valley, CA
- Medical school
- Creighton University School of Medicine
- Graduated
- 2014
- NPI registered
- 2014
- NPI
- 1891115572
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does John Hollowed practice?
John Hollowed, MD is based in Simi Valley, CA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is John Hollowed's NPI number?
John Hollowed's National Provider Identifier (NPI) is 1891115572, registered in 2014. Specialty on record: Interventional Cardiology; credential MD.
Where did John Hollowed go to medical school?
John Hollowed, MD attended Creighton University School of Medicine, graduating in 2014.
How many Interventional Cardiology providers in California work at ambulatory surgery centers?
77 Interventional Cardiology surgeons and proceduralists in California are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, John Hollowed among them. The California Interventional Cardiology directory lists each one by city with credential, NPI, and center affiliations.
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