Michael Zach Koontz, MD
Internal Medicine Physician · Monterey, CA
Michael Zach Koontz, MD is an internal medicine physician with a practice address in Monterey, California, and NPI 1245410588, issued on Nov 4, 2007. Check the license (California A105130, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Zach Koontz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A105130 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5 Harris CT Bldg T, Monterey, CA 93940
- Phone
- (831) 375-4105
- Enumerated
- Nov 4, 2007
- Record last updated
- Jul 1, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (831) 655-1277
- Medicare enrollment
- Enrolled (PECOS I20091211000199); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 2007
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 5 Harris CT Bldg T
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Andrew MadridPhysical Therapist1114474301
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Verify Michael Zach Koontz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A105130Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average internal medicine physician in 2024
671 Medicare Part D claims for 145 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 14 claims were for opioids.
Most prescribed
- Prednisone77 claims
- Abiraterone Acetate44 claims
- Levothyroxine Sodium27 claims
- Procrit22 claims
- Dexamethasone21 claims
- Ondansetron Hcl21 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): 96.5 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: $17.85
1 payment: food and beverage; the largest payer was Myriad Genetic Laboratories, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Monterey Bay Oncology A Medical CorporationMonterey, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Zach Koontz among 17,696 internal medicine physician records in California
Michael Zach Koontz, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2007 · median 2004 among the 11,065 with a school on file
- Record last updated2014 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
29 internal medicine physician records list a practice address in Monterey
They are 29 of the 1,945 NPPES records with a practice address in Monterey, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Monterey → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rebecca Abundis, D.OMonterey, CA 939401144227372
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- Ronald Garren, M.D.Monterey, CA 939401720152663
- Craig Geiler, M.D.Monterey, CA 939401891711529
- Sattar Hadi, MDMonterey, CA 939401437105145
- Georgina Heal, M.D.Monterey, CA 939401639129901
- Edward Kennedy, MDMonterey, CA 939401912098534
- Richard King, MDMonterey, CA 939401144390048
Common questions
What is Michael Zach Koontz, MD's NPI number?
Michael Zach Koontz, MD's National Provider Identifier (NPI) is 1245410588, issued on Nov 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Michael Zach Koontz, MD located?
The NPPES record lists a practice address at 5 Harris CT Bldg T, Monterey, CA, 93940. Phone: (831) 375-4105. Providers update this record themselves, so call before visiting.
How can I verify Michael Zach Koontz, MD's license?
NPPES lists California license number A105130, 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 Michael Zach Koontz, MD prescribe under Medicare Part D?
In 2024, Michael Zach Koontz, MD had 671 Medicare Part D claims for 145 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Michael Zach Koontz, MD's MIPS final score?
The 2023 MIPS final score is 96.5 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.