Siena Elisa Ona, MD

Physical Medicine & Rehabilitation · Dieumy Michelle Thai M D INC

Physical Medicine & RehabilitationHigh data-match confidence

Directory record — please verify

This listing comes from CMS Medicare Doctors and Clinicians data and was updated August 2, 2026. It does not confirm Medicare coverage, plan network, referral or prior authorization, offered services, or current availability. Verify each item directly before scheduling.

At a glance

Siena Elisa Ona, MD is listed as a Physical Medicine & Rehabilitation in Fullerton, CA. Call 7147718000 to confirm current participation and availability.

Services & care categories

Physical Medicine & Rehabilitation Accepts Medicare assignment

Medicare questions to ask

1Do you currently accept Medicare assignment for these services?
2Is this location in-network for my Medicare Advantage plan?
3Will I need a referral or prior authorization before my visit?
4What out-of-pocket costs should I expect under Medicare?
5Do you provide the specific care I need (pain management, PM&R, behavioral health, or mild TBI)?

Location

Frequently asked questions

Does Siena Elisa Ona, MD accept Medicare?

Siena Elisa Ona, MD is an imported senior-care record. Confirm Medicare participation and network status directly with the facility before scheduling.

Where is Siena Elisa Ona, MD located?

Siena Elisa Ona, MD is located at 101 E Valencia Mesa Dr, Fullerton, CA 92835.

What is the phone number for Siena Elisa Ona, MD?

You can reach Siena Elisa Ona, MD at 7147718000.

What care does Siena Elisa Ona, MD offer?

Listed services include Physical Medicine & Rehabilitation, Accepts Medicare assignment. Verify availability with the facility.

Source

CMS Medicare Doctors and Clinicians data.

How directory records are sourced and updated

Medicare questions to ask

1Do you currently accept Medicare assignment for these services?
2Is this location in-network for my Medicare Advantage plan?
3Will I need a referral or prior authorization before my visit?
4What out-of-pocket costs should I expect under Medicare?
5Do you provide the specific care I need (pain management, PM&R, behavioral health, or mild TBI)?

Location

Frequently asked questions

Does Siena Elisa Ona, MD accept Medicare?

Siena Elisa Ona, MD is an imported senior-care record. Confirm Medicare participation and network status directly with the facility before scheduling.

Where is Siena Elisa Ona, MD located?

Siena Elisa Ona, MD is located at 101 E Valencia Mesa Dr, Fullerton, CA 92835.

What is the phone number for Siena Elisa Ona, MD?

You can reach Siena Elisa Ona, MD at 7147718000.

What care does Siena Elisa Ona, MD offer?

Listed services include Physical Medicine & Rehabilitation, Accepts Medicare assignment. Verify availability with the facility.