Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Oksana B Hirniak, DO

Individual provider Family Medicine Physician · NPI 1891750345

Oksana B Hirniak, DO is a Family Practice in San Marcos, California. Graduated from Philadelphia College of Osteopathic Medicine in 2004, 22 years ago. Practices with Graybill Medical Group Inc, a 104-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
22
Trained at
Philadelphia College of Osteopathic Medicine
Licensed in
CA
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

277 Rancheros Dr Ste 100
San Marcos, CA 92069-2959
Phone: (760) 291-6700
Fax: (760) 471-0513
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 20A11789 (CA)

Record details

NPI number1891750345
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedApril 18, 2006
Last updated in NPPESDecember 12, 2024
Certification dateDecember 12, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Also practisesOSTEOPATHIC MANIPULATIVE MEDICINE
Medical schoolPHILADELPHIA COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 2004 (22 years in practice)
Group practice Graybill Medical Group Inc — 104 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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