GREGORY L TOM O.D.
NPI 1124245568
Optometrist - Corneal and Contact Management in San Ramon, CA
About Gregory L Tom O.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GREGORY L TOM O.D. (NPI 1124245568) is an individual corneal and contact management provider in San Ramon, California, licensed in California (10427T) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS and is a graduate of University Of California - School Of Optometry (1994).
NPPES Registry Identity
Specialties & Licenses 5
Accepted Insurance
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
Gregory L Tom O.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 Gregory Tom reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Danville, CA 94506
- Reassigned Medicare billing, California enrollment
- 2 clinicians in this Medicare group
Fremont, CA 94539
- Reassigned Medicare billing, California enrollment
- 5 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 9
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 94582 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Gregory Tom's NPI number?
The NPI number for Gregory Tom is 1124245568. It was assigned to this individual provider in the NPPES registry on April 19, 2007.
Where is Gregory Tom located?
Gregory Tom practices at 202 Aspenwood Ct # 1, San Ramon, CA 94582. The listed phone number is (510) 206-8152.
What is Gregory Tom's specialty?
The primary specialty registered for this NPI is Optometrist, specializing in Corneal and Contact Management, with taxonomy code 152WC0802X.
Is Gregory Tom enrolled in Medicare?
Yes. Gregory Tom 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 Gregory Tom's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Tom reassigns Medicare benefits to 2 organizations: Danville Optometric Eye Clinic (Danville, CA) and Sarbjit Singh Hundal (Fremont, 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 Gregory Tom's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Gregory Tom accept?
Health plans from Anthem Blue Cross and Blue Shield, Blue Cross Blue Shield of Wyoming, Blue Cross and Blue Shield of Louisiana, Blue Cross and Blue Shield of Montana and Blue Cross and Blue Shield of Oklahoma and 2 other insurers list Gregory Tom as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Gregory Tom was last updated on August 24, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.
# Gregory L Tom, O.D. · NPI 1124245568
Corneal and Contact Management provider in San Ramon, California. Individual provider, active in the CMS NPPES registry since April 19, 2007.
## Identity
- **NPI:** 1124245568 (Entity type: Individual)
- **Enumerated:** April 19, 2007
- **Primary specialty:** Optometrist - Corneal and Contact Management · taxonomy 152WC0802X
- **State license:** 10427T (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 202 ASPENWOOD CT # 1, San Ramon, CA 94582-5028
- **Phone:** (510) 206-8152
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Danville Optometric Eye Clinic (NPI 1750902391, Danville, CA); Sarbjit Singh Hundal (NPI 1962413708, Fremont, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California - School Of Optometry, class of 1994
## Record status
- **NPPES last updated:** August 24, 2009
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Source: [NPI Profile](https://npiprofile.com/npi/1124245568) · Data from the CMS NPPES public registry.