Marc Segall, M.D.
Ophthalmology Physician · Downey, CA
Marc Segall, M.D. is an ophthalmology physician with a practice address in Downey, California, and NPI 1326151531, issued on Aug 15, 2006. Check the license (California G23733, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marc Segall
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- G23733 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11411 Brookshire Ave, Downey, CA 90241
- Phone
- (562) 862-7347
- Enumerated
- Aug 15, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (562) 862-4178
- Medicaid ID
- 00G237330 CA
- Medicare enrollment
- Enrolled (PECOS I20110414000309); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 1970
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 11411 Brookshire Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Heidi Groessl, PACPhysician Assistant1417086026
- James Hager, PA-CPhysician Assistant1205805868
Verify Marc Segall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G23733Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $145.33
1 payment: food and beverage; the largest payer was Bausch & Lomb Americas Inc. The 13,221 providers of this specialty with any payment received $4,535.02 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.
Marc Segall among 2,899 ophthalmology physician records in California
Marc Segall, M.D. is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 45% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1970 · median 2001 among the 1,907 with a school on file
- 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 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Downey → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Brian Brown, M.D.Downey, CA 902411992748479
- Thomas Choi, M.D.Downey, CA 902411477555985
- Joseph Hsu, MDDowney, CA 902411760584270
- Annie Lim, MDDowney, CA 902421639377310
- Amy McCluskey, MDDowney, CA 902421598813305
- Quoc-Tuan Ngo, MDDowney, CA 902421437787645
- Mehrdad Aghai, M.D.Gardena, CA 902471841302577
- Amarpreet BrarGardena, CA 902471356361109
Common questions
What is Marc Segall, M.D.'s NPI number?
Marc Segall, M.D.'s National Provider Identifier (NPI) is 1326151531, issued on Aug 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marc Segall, M.D. located?
The NPPES record lists a practice address at 11411 Brookshire Ave, Downey, CA, 90241. Phone: (562) 862-7347. Providers update this record themselves, so call before visiting.
How can I verify Marc Segall, M.D.'s license?
NPPES lists California license number G23733, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.