TIMOTHY CHEN M.D
NPI 1821617259
Ophthalmology in Orange, CA
About Timothy Chen M.d NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TIMOTHY CHEN M.D (NPI 1821617259) is an individual ophthalmology provider in Orange, California, licensed in California (194317) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS and is a graduate of Columbia University College Of Physicians And Surgeons (2020).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Timothy Chen M.d is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Timothy Chen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 113 clinicians in this Medicare group
Henderson, NV 89052
- Reassigned Medicare billing, Nevada enrollment
- 23 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92868 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ORANGE, CA 92868
ORANGE, CA 92868
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Timothy Chen's NPI number?
The NPI number for Timothy Chen is 1821617259. It was assigned to this individual provider in the NPPES registry on April 15, 2020.
Where is Timothy Chen located?
Timothy Chen practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (714) 456-7890.
What is Timothy Chen's specialty?
The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.
Is Timothy Chen enrolled in Medicare?
Yes. Timothy Chen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Timothy Chen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Timothy Chen reassigns Medicare benefits to 2 organizations: Regents Of The University Of California (Orange, CA) and Meadows Healthcare LLC (Henderson, NV). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Timothy Chen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Timothy Chen was last updated on May 13, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Timothy Chen, M.D · NPI 1821617259
Ophthalmology physician in Orange, California. Individual provider, active in the CMS NPPES registry since April 15, 2020.
## Identity
- **NPI:** 1821617259 (Entity type: Individual)
- **Enumerated:** April 15, 2020
- **Primary specialty:** Ophthalmology · taxonomy 207W00000X
- **State license:** 194317 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 THE CITY DR S, Orange, CA 92868-3201
- **Phone:** (714) 456-7890
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California (NPI 1871541953, Orange, CA); Meadows Healthcare LLC (NPI 1881083921, Henderson, NV) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Columbia University College Of Physicians And Surgeons, class of 2020
## Record status
- **NPPES last updated:** May 13, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1821617259) · Data from the CMS NPPES public registry.