Oscar Chen, MD, MS - Medicare Ophthalmology in Lexington, MA

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Oscar Chen, MD, MS is a medicare enrolled "Ophthalmology" physician in Lexington, Massachusetts. He went to Rush Medical College Of Rush University and graduated in 2021 and has 5 years of diverse experience with area of expertise as Ophthalmology. He is a member of the group practice Regents Of The University Of California and his current practice location is 21 Worthen Rd, Lexington, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (781) 876-2020.

Oscar Chen is licensed to practice in Massachusetts (license number 1025773) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1598329989.

Contact Information

Oscar Chen, MD, MS
21 Worthen Rd,
Lexington, MA 02421-4835
(781) 876-2020
Not Available

Map and Direction




Physician's Profile

Full NameOscar Chen
GenderMale
SpecialityOphthalmology
Experience5 Years
Location21 Worthen Rd, Lexington, Massachusetts
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Oscar Chen attended and graduated from Rush Medical College Of Rush University in 2021
  NPI Data:
  • NPI Number: 1598329989
  • Provider Enumeration Date: 05/01/2019
  • Last Update Date: 10/23/2026
  Medicare PECOS Information:
  • PECOS PAC ID: 4880097674
  • Enrollment ID: I20250606001655

Medical Identifiers

Medical identifiers for Oscar Chen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1598329989NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207W00000XOphthalmology 1025773 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Uci Health-orangeOrange, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Regents Of The University Of California983009427552

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. Oscar Chen allows following entities to bill medicare on his behalf.
Entity NameRegents of the University of California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1871541953
PECOS PAC ID: 9830094275
Enrollment ID: O20031126000755

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. Oscar Chen 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
Oscar Chen, MD, MS
21 Worthen Rd,
Lexington, MA 02421-4835

Ph: (781) 876-2020		Oscar Chen, MD, MS
21 Worthen Rd,
Lexington, MA 02421-4835

Ph: (781) 876-2020

Reviews and Comments


Ophthalmology Doctors in Lexington, MA

Daniel W Tolpin, MD
Ophthalmology
Medicare: Not Enrolled in Medicare
Practice Location: 21 Worthen Rd, Lexington, MA 02421
Phone: 781-862-1620    
Dr. Nancy S Slater, M.D.
Ophthalmology
Medicare: Not Enrolled in Medicare
Practice Location: 48 North St, Lexington, MA 02420
Phone: 781-862-7893    Fax: 781-862-7893
Dr. Olivia Liao, MD
Ophthalmology
Medicare: May Accept Medicare Assignments
Practice Location: 21 Worthen Rd, Lexington, MA 02421
Phone: 781-862-1620    Fax: 781-863-9416
Dr. Jared E Duncan, M.D.
Ophthalmology
Medicare: May Accept Medicare Assignments
Practice Location: 21 Worthen Rd, Lexington, MA 02421
Phone: 781-862-1620    
Kenneth Matthew Mckay, M.D.
Ophthalmology
Medicare: Accepting Medicare Assignments
Practice Location: 110 Hartwell Ave Ste 101, Lexington, MA 02421
Phone: 781-890-1023    
Dr. Ann Pawlowski Burnham, M.D.
Ophthalmology
Medicare: Not Enrolled in Medicare
Practice Location: 21 Worthen Rd, Lexington, MA 02421
Phone: 781-862-1620    Fax: 781-863-9416
Dr. Jennifer Mullon, M.D.
Ophthalmology
Medicare: May Accept Medicare Assignments
Practice Location: 21 Worthen Rd, Lexington, MA 02421
Phone: 781-862-1620    

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.