Olivia Choon Ong, MD - Medicare Ophthalmology in Monrovia, CA

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Olivia Choon Ong, MD is a medicare enrolled "Ophthalmology - Glaucoma Specialist" physician in Monrovia, California. She went to University Of California, Geffen School Of Medicine and graduated in 1997 and has 27 years of diverse experience with area of expertise as Ophthalmology. She is a member of the group practice California Eye Specialists Medical Group Inc and her current practice location is 855 W Foothill Blvd, Monrovia, California. You can reach out to her office (for appointments etc.) via phone at (626) 358-1080.

Olivia Choon Ong is licensed to practice in California (license number A66933) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1124021688.

Contact Information

Olivia Choon Ong, MD
855 W Foothill Blvd,
Monrovia, CA 91016-1938
(626) 358-1080
(626) 358-0548

Map and Direction




Physician's Profile

Full NameOlivia Choon Ong
GenderFemale
SpecialityOphthalmology
Experience27 Years
Location855 W Foothill Blvd, Monrovia, California
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Olivia Choon Ong attended and graduated from University Of California, Geffen School Of Medicine in 1997
  NPI Data:
  • NPI Number: 1124021688
  • Provider Enumeration Date: 05/27/2005
  • Last Update Date: 06/06/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 6608934724
  • Enrollment ID: I20081018000111

Medical Identifiers

Medical identifiers for Olivia Choon Ong such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1124021688NPI-NPPES
00A669330MedicaidCA
00A669331OtherCABLUE CROSS

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207WX0009XOphthalmology - Glaucoma Specialist A66933 (California)Primary
207W00000XOphthalmology A66933 (California)Secondary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
California Eye Specialists Medical Group Inc680079338123

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Olivia Choon Ong allows following entities to bill medicare on her behalf.
Entity NameCalifornia Eye Specialists Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1699713099
PECOS PAC ID: 6800793381
Enrollment ID: O20031212000932

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Olivia Choon Ong is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Olivia Choon Ong, MD
14726 Ramona Ave Ste 203,
Chino, CA 91710-5730

Ph: (626) 305-9100		Olivia Choon Ong, MD
855 W Foothill Blvd,
Monrovia, CA 91016-1938

Ph: (626) 358-1080

Reviews and Comments


Ophthalmology Doctors in Monrovia, CA

Dr. Jay R Patel, MD
Ophthalmology
Medicare: Accepting Medicare Assignments
Practice Location: 855 W Foothill Blvd, Monrovia, CA 91016
Phone: 626-305-9100    Fax: 626-305-9150
Pauline Lim, M.D.
Ophthalmology
Medicare: Medicare Enrolled
Practice Location: 855 W Foothill Blvd, Monrovia, CA 91016
Phone: 626-358-1080    
Mr. Marcus J Lemley, MD
Ophthalmology
Medicare: Not Enrolled in Medicare
Practice Location: 855 W Foothill Blvd, Monrovia, CA 91016
Phone: 626-305-9100    Fax: 626-305-9150

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.