DR. STEPHEN B PREPAS M.D.
NPI 1023103660
Ophthalmology - Pediatric Ophthalmology and Strabismus Specialist in Irvine, CA
About Dr. Stephen B Prepas M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEPHEN B PREPAS M.D. (NPI 1023103660) is an individual pediatric ophthalmology and strabismus specialist in Irvine, California, licensed in California (G32851) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Newport Beach, and is a graduate of University Of California, Irvine, California College Of Medicine (1975).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 1
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
Dr. Stephen B Prepas 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 Stephen Prepas 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
- 85 clinicians in this Medicare group
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 113 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 3
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 92617 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.
IRVINE, CA 92617
IRVINE, CA 92617
IRVINE, CA 92617
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 Stephen Prepas's NPI number?
The NPI number for Stephen Prepas is 1023103660. It was assigned to this individual provider in the NPPES registry on October 3, 2006.
Where is Stephen Prepas located?
Stephen Prepas practices at 850 Health Sciences Rd, Irvine, CA 92617. The listed phone number is (949) 824-2020.
What is Stephen Prepas's specialty?
The primary specialty registered for this NPI is Ophthalmology, specializing in Pediatric Ophthalmology and Strabismus Specialist, with taxonomy code 207WX0110X.
Is Stephen Prepas enrolled in Medicare?
Yes. Stephen Prepas 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 Stephen Prepas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Prepas reassigns Medicare benefits to 2 organizations: Regents Of The University Of California (Orange, CA) and Regents Of The University Of California (Orange, CA). 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 Stephen Prepas'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 Stephen Prepas was last updated on January 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 months 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.
# Dr. Stephen B Prepas, M.D. · NPI 1023103660
Pediatric Ophthalmology and Strabismus Specialist physician in Irvine, California. Individual provider, active in the CMS NPPES registry since October 3, 2006.
## Identity
- **NPI:** 1023103660 (Entity type: Individual)
- **Enumerated:** October 3, 2006
- **Primary specialty:** Ophthalmology - Pediatric Ophthalmology and Strabismus Specialist · taxonomy 207WX0110X
- **State license:** G32851 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 850 HEALTH SCIENCES RD, Irvine, CA 92617-3058
- **Phone:** (949) 824-2020
## 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 1487602579, Orange, CA); Regents Of The University Of California (NPI 1871541953, Orange, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Irvine, California College Of Medicine, class of 1975
## Record status
- **NPPES last updated:** January 23, 2025
- **Other identifiers:** Medicaid GR0044731 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1023103660) · Data from the CMS NPPES public registry.