Oksana Hirniak, D.O.
NPI 1891750345 · Family Medicine Physician · San Marcos, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Oksana Hirniak, D.O. is a Family Medicine Physician provider in San Marcos, CA (NPI 1891750345).
Provider details
- NPI number
- 1891750345
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- No
- License
- 20A11789 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
282 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 225 | $137 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 19 | $138 |
| Screening Mammography77067 | 14 | $142 |
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 13 | $44 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 11 | $97 |
Typical Medicare-allowed amounts for these services range $44–$142 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 75 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 278 | 93 |
| Lisinopril | 183 | 56 |
| Levothyroxine Sodium | 156 | 49 |
| Metformin Hcl | 147 | 45 |
| Losartan Potassium | 145 | 40 |
| Amlodipine Besylate | 143 | 36 |
| Omeprazole |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$368 across 19 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-18
- Last updated
- 2024-12-12
- Certified
- 2024-12-12
Frequently asked questions
- What is Oksana Hirniak's NPI number?
- Oksana Hirniak's National Provider Identifier (NPI) is 1891750345, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Oksana Hirniak's specialty?
- Oksana Hirniak is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Oksana Hirniak located?
- Oksana Hirniak's practice location on file with NPPES is 277 Rancheros Dr Ste 100, San Marcos, CA 92069-2959.
- What is Oksana Hirniak's phone number?
- The practice phone number listed in the NPPES registry for Oksana Hirniak is (760) 291-6700.
- Does Oksana Hirniak accept Medicare?
- Oksana Hirniak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Oksana Hirniak's NPI active?
- Yes — Oksana Hirniak's NPI (1891750345) is active in the NPPES registry as of the last update on 2024-12-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.