Markkus Hasychak, DO
Family Medicine Physician · San Jose, CA
Markkus Hasychak, DO is a family medicine physician with a practice address in San Jose, California, and NPI 1912657503, issued on Mar 25, 2022. Check the license (California 20A22004, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Markkus Hasychak
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A22004 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6475 Camden Ave Ste 105, San Jose, CA 95120
- Phone
- (408) 997-9155
- Enumerated
- Mar 25, 2022
- Record last updated
- Aug 14, 2025
- Medicare enrollment
- Enrolled (PECOS I20250507001881); accepts Medicare assignment
- Medical or professional school
- Touro Un Col Of Osteopathic Medicine, Henderson, 2022
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 6475 Camden Ave Ste 105
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Divyaradha Krishnan Seethapathy, MDFamily Medicine Physician1902548381
- Nicole Lewis, M.D.Family Medicine Physician1679860142
- Daniel Lopez, M.D.Family Medicine Physician1265430144
Verify Markkus Hasychak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A22004Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% fewer Medicare Part D claims than the average family medicine physician in 2024
1,132 Medicare Part D claims for 270 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 42 claims were for opioids.
Most prescribed
- Atorvastatin Calcium77 claims
- Amlodipine Besylate52 claims
- Lisinopril42 claims
- Losartan Potassium41 claims
- Gabapentin37 claims
- Metformin Hcl29 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.
Bills Medicare through one group practice
- University Healthcare AllianceSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
265 family medicine physician records list a practice address in San Jose
They are 265 of the 20,925 NPPES records with a practice address in San Jose, and 17,133 family medicine physician records in California.
All 265 in San Jose → All 17,133 in California → Every provider in San Jose →
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- Lorraine Abate, M.D.Sacramento, CA1104840008
- Robert Abatecola, MDCastro Valley, CA1669551719
- Romeo Abaya, M.D.Cottonwood, CA1598053506
- Effiem Abbah, MD, MPHSan Francisco, CA1821185133
- Khuzeman Abbasi, MDSanta Rosa, CA1841979952
Common questions
What is Markkus Hasychak, DO's NPI number?
Markkus Hasychak, DO's National Provider Identifier (NPI) is 1912657503, issued on Mar 25, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Markkus Hasychak, DO located?
The NPPES record lists a practice address at 6475 Camden Ave Ste 105, San Jose, CA, 95120. Phone: (408) 997-9155. Providers update this record themselves, so call before visiting.
How can I verify Markkus Hasychak, DO's license?
NPPES lists California license number 20A22004, 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 Markkus Hasychak, DO prescribe under Medicare Part D?
In 2024, Markkus Hasychak, DO had 1,132 Medicare Part D claims for 270 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.