Zachary Michael Zwolak, D.O.
Addiction Medicine (Family Medicine) Physician · Ventura, CA
Zachary Michael Zwolak, D.O. is an addiction medicine (family medicine) physician with a practice address in Ventura, California, and NPI 1265695571, issued on Jul 7, 2008. Check the license (California 20A12298, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Zachary Michael Zwolak
- Credential
- D.O.
- Primary taxonomy
- Addiction Medicine (Family Medicine) Physician 207QA0401X
- License number
- 20A12298 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Hillmont Ave, Ventura, CA 93003
- Phone
- (805) 652-6100
- Enumerated
- Jul 7, 2008
- Record last updated
- Aug 8, 2024
- Fax
- (805) 652-3252
- Medicare enrollment
- Enrolled (PECOS I20130409000100); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2008
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest addiction medicine (family medicine) physician records → All 124 in California → Look up another NPI →
Also registered at 300 Hillmont Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Thomas Adelman, CRTTCertified Respiratory Therapist1114732666
- Henrique Aihara, TECHElectroneurodiagnostic Specialist/Technologist1861108235
- Anne Akhimien, MDFamily Medicine Physician1205408515
- Trease Allen, PSYCH TECHLicensed Psychiatric Technician1174648620
- Mary Allport, LCSWClinical Social Worker1083739320
- Edgar Alviz, RNPsychiatric/Mental Health Registered Nurse1386763175
Verify Zachary Michael Zwolak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A12298Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average addiction medicine (family medicine) physician in 2024
442 Medicare Part D claims for 50 beneficiaries, against an average of 664 among the 581 providers of this specialty who prescribed in Part D.
Most prescribed
- Rosuvastatin Calcium31 claims
- Atorvastatin Calcium27 claims
- Metformin Hcl21 claims
- Meloxicam20 claims
- Albuterol Sulfate Hfa15 claims
- Lisinopril15 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): 87.2 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: $200.83
9 payments; by number, the most common kind was food and beverage; the largest payer was Indivior Inc. The 305 providers of this specialty with any payment received $1,151.00 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 2 group practices
- Community Memorial Health SystemVentura, CA
- County OF VenturaVentura, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Zachary Michael Zwolak among 124 addiction medicine (family medicine) physician records in California
Zachary Michael Zwolak, D.O. is one of 124 addiction medicine (family medicine) physician records with a practice address in California. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 36% of them.
- NPI issued2008 · 36% of these records are older, 60% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated2008 · median 2015 among the 64 with a school on file
- Record last updated2024 · 33% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QA0401X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Addiction Medicine (Family Medicine) Physician providers in California
There are 124 addiction medicine (family medicine) physician records in California.
All 124 in California → Every provider in Ventura → Addiction Medicine (Family Medicine) Physician nationwide →
The 8 addiction medicine (family medicine) physician records with the nearest ZIP codes
- Lorenz Choi, DOVentura, CA 930031619592623
- Christopher Fernandez, DOVentura, CA 930031902427404
- Alexander Howard, DOVentura, CA 930031528707593
- Tipu Khan, M.D.Ventura, CA 930031801059555
- Morgan Kirkpatrick, MDVentura, CA 930031457915795
- Matthew Lamon, DOVentura, CA 930031356835243
- Olivia NguyenVentura, CA 930031902478779
- Oluwatumininu Oludemi, DOVentura, CA 930031013656883
Common questions
What is Zachary Michael Zwolak, D.O.'s NPI number?
Zachary Michael Zwolak, D.O.'s National Provider Identifier (NPI) is 1265695571, issued on Jul 7, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Zachary Michael Zwolak, D.O. located?
The NPPES record lists a practice address at 300 Hillmont Ave, Ventura, CA, 93003. Phone: (805) 652-6100. Providers update this record themselves, so call before visiting.
How can I verify Zachary Michael Zwolak, D.O.'s license?
NPPES lists California license number 20A12298, 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 Zachary Michael Zwolak, D.O. prescribe under Medicare Part D?
In 2024, Zachary Michael Zwolak, D.O. had 442 Medicare Part D claims for 50 beneficiaries; the average among addiction medicine (family medicine) physician prescribers was 664. Part D covers Medicare prescriptions only.
What is Zachary Michael Zwolak, D.O.'s MIPS final score?
The 2023 MIPS final score is 87.2 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.