Mark Gerard Byrne, M.D.
Interventional Cardiology Physician · Watsonville, CA
Mark Gerard Byrne, M.D. is an interventional cardiology physician with a practice address in Watsonville, California, and NPI 1962411272, issued on Aug 5, 2006. Check the license (California G74388, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Gerard Byrne
- Credential
- M.D.
- Primary taxonomy
- Interventional Cardiology Physician 207RI0011X
- License number
- G74388 CA
Self-reported in NPPES; status is on the state search - Practice location
- 30 Brennan St, Watsonville, CA 95076
- Phone
- (831) 768-0220
- Enumerated
- Aug 5, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (831) 722-1702
- Medicaid ID
- 00G743880 CA
- Medicare enrollment
- Enrolled (PECOS I20110712000540); accepts Medicare assignment
- Medical or professional school
- Illinois Medical College, 1989
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest interventional cardiology physician records → All 632 in California → Look up another NPI →
Also registered at 30 Brennan St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Francis Bayaca, M.D.Family Medicine Physician1427067768
- Evelyn Chin, FNP-BCFamily Nurse Practitioner1891117388
- Stephanie Garcia TorresPhysician Assistant1477072775
- Christopher Mills, PAPhysician Assistant1306243506
- Mary Murphy, CERTIFIED NUTRITIONNutritionist1811727027
Verify Mark Gerard Byrne in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G74388Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.8 times the Medicare Part D claims of the average interventional cardiology physician in 2024
8,839 Medicare Part D claims for 480 beneficiaries, against an average of 3,179 among the 6,605 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 337 claims were for opioids.
Most prescribed
- Carvedilol541 claims
- Losartan Potassium512 claims
- Atorvastatin Calcium477 claims
- Rosuvastatin Calcium358 claims
- Irbesartan324 claims
- Montelukast Sodium275 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 98 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,140.43
44 payments; by number, the most common kind was food and beverage; the largest payer was Mylan Specialty L.P. The 6,394 providers of this specialty with any payment received $7,062.29 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Brennan Medical CorporationWatsonville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Gerard Byrne among 632 interventional cardiology physician records in California
Mark Gerard Byrne, M.D. is one of 632 interventional cardiology physician records with a practice address in California. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 52% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated1989 · median 2001 among the 526 with a school on file
- Record last updated2007 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0011X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Interventional Cardiology Physician providers in California
There are 632 interventional cardiology physician records in California.
All 632 in California → Every provider in Watsonville → Interventional Cardiology Physician nationwide →
The 8 interventional cardiology physician records with the nearest ZIP codes
- Charnjeet Sandhu, M.D.Santa Cruz, CA 950651669904256
- Ethan Daniels, MDSanta Clara, CA 950511699852558
- Vindhya Hindnavis, M.D.,Santa Clara, CA 950511730353756
- Joseph Yang, M.D.Santa Clara, CA 950511003115486
- Michael Caulfield, MDSan Jose, CA 951191275619785
- Mateo Go, MDSan Jose, CA 951191023194537
- Arthur Lee, MDSan Jose, CA 951191194899419
- William Ricks, MDLos Gatos, CA 950301033197306
Common questions
What is Mark Gerard Byrne, M.D.'s NPI number?
Mark Gerard Byrne, M.D.'s National Provider Identifier (NPI) is 1962411272, issued on Aug 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Gerard Byrne, M.D. located?
The NPPES record lists a practice address at 30 Brennan St, Watsonville, CA, 95076. Phone: (831) 768-0220. Providers update this record themselves, so call before visiting.
How can I verify Mark Gerard Byrne, M.D.'s license?
NPPES lists California license number G74388, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Gerard Byrne, M.D. prescribe under Medicare Part D?
In 2024, Mark Gerard Byrne, M.D. had 8,839 Medicare Part D claims for 480 beneficiaries; the average among interventional cardiology physician prescribers was 3,179. Part D covers Medicare prescriptions only.
What is Mark Gerard Byrne, M.D.'s MIPS final score?
The 2023 MIPS final score is 98 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.