EUGENIA PAULA CUSTO GREIG MD
NPI 1649856477
Ophthalmology in Palo Alto, CA
About Eugenia Paula Custo Greig Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
EUGENIA PAULA CUSTO GREIG MD (NPI 1649856477) is an individual ophthalmology provider in Palo Alto, California, licensed in California (A180994) and active in the NPI registry since March 2021. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Yale University School Of Medicine (2021).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
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
Eugenia Paula Custo Greig Md 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
5Medicare enrollment records show Eugenia Custo Greig reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 clinicians in this Medicare group
Palo Alto, CA 94301
- Reassigned Medicare billing, California enrollment
- 4,479 clinicians in this Medicare group
Palo Alto, CA 94306
- Reassigned Medicare billing, California enrollment
- 2,460 clinicians in this Medicare group
Yucca Valley, CA 92284
- Reassigned Medicare billing, California enrollment
- 595 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94305 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.
STANFORD, CA 94305
STANFORD, CA 94305
STANFORD, CA 94305
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 Eugenia Custo Greig's NPI number?
The NPI number for Eugenia Custo Greig is 1649856477. It was assigned to this individual provider in the NPPES registry on March 22, 2021.
Where is Eugenia Custo Greig located?
Eugenia Custo Greig practices at 300 Pasteur Dr, Palo Alto, CA 94305. The listed phone number is (650) 723-4000.
What is Eugenia Custo Greig's specialty?
The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.
Is Eugenia Custo Greig enrolled in Medicare?
Yes. Eugenia Custo Greig 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 Eugenia Custo Greig's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Eugenia Custo Greig reassigns Medicare benefits to 5 organizations: Stanford Health Care (Stanford, CA), Lpch Medical Group Div Of Lucile (Palo Alto, CA), Sutter Bay Medical Foundation (Palo Alto, CA), County Of Santa Clara (Palo Alto, CA) and Eisenhower Medical Center (Yucca Valley, 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 Eugenia Custo Greig'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 Eugenia Custo Greig was last updated on July 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Eugenia Paula Custo Greig, MD · NPI 1649856477
Ophthalmology physician in Palo Alto, California. Individual provider, active in the CMS NPPES registry since March 22, 2021.
## Identity
- **NPI:** 1649856477 (Entity type: Individual)
- **Enumerated:** March 22, 2021
- **Primary specialty:** Ophthalmology · taxonomy 207W00000X
- **State license:** A180994 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Palo Alto, CA 94305-2200
- **Phone:** (650) 723-4000
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Stanford Health Care (NPI 1437292927, Stanford, CA); Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA); Sutter Bay Medical Foundation (NPI 1013950807, Palo Alto, CA); County Of Santa Clara (NPI 1144330614, Palo Alto, CA); Eisenhower Medical Center (NPI 1114364866, Yucca Valley, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Yale University School Of Medicine, class of 2021
## Record status
- **NPPES last updated:** July 7, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1649856477) · Data from the CMS NPPES public registry.