Markkus Hasychak, DO
NPI 1912657503 · Family Medicine Physician · San Jose, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Markkus Hasychak, DO is a Family Medicine Physician provider in San Jose, CA (NPI 1912657503).
Provider details
- NPI number
- 1912657503
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- Yes
- License
- 20A22004 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 30 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 77 | 34 |
| Amlodipine Besylate | 52 | 19 |
| Lisinopril | 42 | 19 |
| Losartan Potassium | 41 | 15 |
| Gabapentin | 37 | 14 |
| Metformin Hcl | 29 | — |
| Empagliflozin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-03-25
- Last updated
- 2025-08-14
- Certified
- 2025-08-14
Frequently asked questions
- What is Markkus Hasychak's NPI number?
- Markkus Hasychak's National Provider Identifier (NPI) is 1912657503, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Markkus Hasychak's specialty?
- Markkus Hasychak is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Markkus Hasychak located?
- Markkus Hasychak's practice location on file with NPPES is 6475 Camden Ave Ste 105, San Jose, CA 95120-2847.
- What is Markkus Hasychak's phone number?
- The practice phone number listed in the NPPES registry for Markkus Hasychak is (408) 997-9155.
- Does Markkus Hasychak accept Medicare?
- Markkus Hasychak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Markkus Hasychak's NPI active?
- Yes — Markkus Hasychak's NPI (1912657503) is active in the NPPES registry as of the last update on 2025-08-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.