NPPES file of Aug 9, 2026

Thomas Mark Longa, O.D.

Optometrist · Redwood City, CA

Thomas Mark Longa, O.D. is an optometrist with a practice address in Redwood City, California, and NPI 1821155656, issued on Jan 2, 2007. Check the license (California 6500T, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1821155656
Name
Thomas Mark Longa
Credential
O.D.
Primary taxonomy
Optometrist 152W00000X
License number
6500T CA
Self-reported in NPPES; status is on the state search
Practice location
910 Maple St, Redwood City, CA 94063
Phone
(650) 299-2040
Enumerated
Jan 2, 2007
Record last updated
Jul 10, 2007 (not updated in 19 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest optometrist records → All 8,308 in California → Look up another NPI →

Also registered at 910 Maple St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Debra Cheung, O.D.Optometrist1467780171
  2. Geoffrey Cumming, O.D.Optometrist1982757084
  3. Elisabeth Giessler, O.D.Optometrist1225180912
  4. Kevin Holtman, O.D.Optometrist1427174432
  5. Corey Lee, O.D.Optometrist1609933563
  6. David Reinow, O.D.Optometrist1083763957

Verify Thomas Mark Longa in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 6500T    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

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Thomas Mark Longa among 8,308 optometrist records in California

Thomas Mark Longa, O.D. is one of 8,308 optometrist records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 34% of them.

  • NPI issued2007 · 34% of these records are older, 46% newer
  • In a Medicare fileNo · 67% of these records are
  • In the CMS Doctors and Clinicians fileNo · 43% of these records are
  • Record last updated2007 · 67% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Optometrist providers in California

There are 8,308 optometrist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 8,308 in California → Every provider in Redwood City → Optometrist nationwide →

The 8 optometrist records with the nearest ZIP codes

  1. Jenny Cheng, O.D.Redwood City, CA 940631437349552
  2. Karen Cheng, O.D.Redwood City, CA 940631407182090
  3. Debra Cheung, O.D.Redwood City, CA 940631467780171
  4. Geoffrey Cumming, O.D.Redwood City, CA 940631982757084
  5. Timothy Dalby, O.D.Redwood City, CA 940631750403945
  6. Linda FlynnRedwood City, CA 940631467500983
  7. Elisabeth Giessler, O.D.Redwood City, CA 940631225180912
  8. Kevin Holtman, O.D.Redwood City, CA 940631427174432

Common questions

What is Thomas Mark Longa, O.D.'s NPI number?

Thomas Mark Longa, O.D.'s National Provider Identifier (NPI) is 1821155656, issued on Jan 2, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Thomas Mark Longa, O.D. located?

The NPPES record lists a practice address at 910 Maple St, Redwood City, CA, 94063. Phone: (650) 299-2040. Providers update this record themselves, so call before visiting.

How can I verify Thomas Mark Longa, O.D.'s license?

NPPES lists California license number 6500T, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.