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

Siena Elisa Nadal Ona, MD

Individual provider Spinal Cord Injury Medicine Physician · NPI 1174963458

Siena Elisa Nadal Ona, MD is registered under Physical Medicine and Rehabilitation in Long Beach, California. Qualified in 2010, 16 years ago. Practices with Dieumy Michelle Thai M D Inc, a 4-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in California and Illinois.

Years since qualifying
16
Licensed in
CA, IL
In the registry since
2013
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2801 Atlantic Ave
Long Beach, CA 90806-1701
Phone: (562) 933-2000
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Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 408 Lincoln Dr, Herrin, IL 62948 — (618) 351-4980
  • 2100 Stantonsburg Rd, Greenville, NC 27834-2818 — (252) 847-7907
  • 1250 E. Marshall Street, Richmond, VA 23298-0677 — (804) 828-8693

Specialties & licences

Spinal Cord Injury Medicine Physician (primary) Taxonomy 2081P0004X · Licence A172213 (CA)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X
Physical Medicine & Rehabilitation Physician Taxonomy 208100000X · Licence 036-145373 (IL)

Record details

NPI number1174963458
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 1, 2013
Last updated in NPPESMay 21, 2026
Certification dateMay 21, 2026

Medicare enrollment

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

Medicare specialtyPHYSICAL MEDICINE AND REHABILITATION
Medical schoolOTHER
Graduated 2010 (16 years in practice)
Group practice Dieumy Michelle Thai M D Inc — 4 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients185
Services billed 1,348 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $391 3 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Also affiliated with 1 inpatient rehabilitation facility, which CMS identifies by certification number only.

Colleagues at Dieumy Michelle Thai M D Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 4 clinicians in the practice; 2 are shown here.

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