Gregory L. Tom, O.D.
Corneal and Contact Management Optometrist · San Ramon, CA
Gregory L. Tom, O.D. is a corneal and contact management optometrist with a practice address in San Ramon, California, and NPI 1124245568, issued on Apr 19, 2007. Check the license (California 10427T, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory L. Tom
- Credential
- O.D.
- Primary taxonomy
- Corneal and Contact Management Optometrist 152WC0802X
- License number
- 10427T CA
Self-reported in NPPES; status is on the state search - Practice location
- 202 Aspenwood CT # 1, San Ramon, CA 94582
- Phone
- (510) 206-8152
- Enumerated
- Apr 19, 2007
- Record last updated
- Aug 24, 2009 (not updated in 17 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150730011161); accepts Medicare assignment
- Medical or professional school
- University Of California - School Of Optometry, 1994
- Entity
- Type 1 · individual
8 nearest corneal and contact management optometrist records → All 161 in California → Look up another NPI →
Verify Gregory L. Tom in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 10427TCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% fewer Medicare Part D claims than the average corneal and contact management optometrist in 2024
195 Medicare Part D claims for 54 beneficiaries, against an average of 225 among the 585 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.
Most prescribed
- Latanoprost73 claims
- Timolol Maleate23 claims
- Neomycin-Polymyxin-Dexameth18 claims
- Doxycycline Hyclate14 claims
- Brimonidine Tartrate12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $3,577.52
14 payments; by number, the most common kind was food and beverage; the largest payer was CooperVision Inc. The 610 providers of this specialty with any payment received $1,035.17 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Danville Optometric Eye ClinicDanville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory L. Tom among 161 corneal and contact management optometrist records in California
Gregory L. Tom, O.D. is one of 161 corneal and contact management optometrist records with a practice address in California. 62% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 47% of them.
- NPI issued2007 · 47% of these records are older, 22% newer
- In a Medicare fileYes · 62% of these records are
- In the CMS Doctors and Clinicians fileYes · 32% of these records are
- Graduated1994 · median 2000 among the 52 with a school on file
- Record last updated2009 · 70% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152WC0802X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Corneal and Contact Management Optometrist providers in California
There are 161 corneal and contact management optometrist records in California.
All 161 in California → Every provider in San Ramon → Corneal and Contact Management Optometrist nationwide →
The 8 corneal and contact management optometrist records with the nearest ZIP codes
- Gary Ozaki, O.D.Dublin, CA 945681932226099
- Randall Ramsey, O.D.Dublin, CA 945681013032655
- Young Chao, O.D.Oakland, CA 946011649465774
- Shital Chatwani, O.D.Newark, CA 945601568578300
- Christine Ko, O.D.Newark, CA 945601811185523
- Edwin Larsen, ODNapa, CA 945591720154339
- Angela Cheung, O.D.Oakland, CA 946101346658184
- Robert Pfost, ODOakland, CA 946101790810364
Common questions
What is Gregory L. Tom, O.D.'s NPI number?
Gregory L. Tom, O.D.'s National Provider Identifier (NPI) is 1124245568, issued on Apr 19, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gregory L. Tom, O.D. located?
The NPPES record lists a practice address at 202 Aspenwood CT # 1, San Ramon, CA, 94582. Phone: (510) 206-8152. Providers update this record themselves, so call before visiting.
How can I verify Gregory L. Tom, O.D.'s license?
NPPES lists California license number 10427T, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Gregory L. Tom, O.D. prescribe under Medicare Part D?
In 2024, Gregory L. Tom, O.D. had 195 Medicare Part D claims for 54 beneficiaries; the average among corneal and contact management optometrist prescribers was 225. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.