Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mark Gerard Byrne, MD

Individual provider Interventional Cardiology Physician · NPI 1962411272

Dr. Mark Gerard Byrne, MD is a Cardiovascular Disease (Cardiology) in Watsonville, California. Graduated from Illinois Medical College in 1989, 37 years ago. Practices with Brennan Medical Corporation, a 2-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
37
Trained at
Illinois Medical College
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

30 Brennan St
Watsonville, CA 95076-4303
Phone: (831) 768-0220
Fax: (831) 722-1702
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Interventional Cardiology Physician (primary) Taxonomy 207RI0011X · Licence G74388 (CA)

Record details

NPI number1962411272
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedAugust 5, 2006
Last updated in NPPESJuly 8, 2007
Mailing address30 Brennan St, Watsonville, CA 95076-4303

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Also practisesINTERNAL MEDICINE
Medical schoolILLINOIS MEDICAL COLLEGE
Graduated 1989 (37 years in practice)
Group practice Brennan Medical Corporation — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services