Marc A. Grossman, M.D.
Specialist · Brea, CA
Marc A. Grossman, M.D. is a specialist with a practice address in Brea, California, and NPI 1033216577, issued on Sep 19, 2006. Check the license (California G42011, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Marc A. Grossman
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- G42011 CA
Self-reported in NPPES; status is on the state search - Practice location
- 340 W Central Ave, Brea, CA 92821
- Phone
- (714) 529-1421
- Enumerated
- Sep 19, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (714) 256-0541
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 340 W Central Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- James Lin, M.D.Family Medicine Physician1619057429
Verify Marc A. Grossman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G42011Check 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: $22.85
1 payment: food and beverage; the largest payer was Novo Nordisk Inc. The 5,844 providers of this specialty with any payment received $4,760.79 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 A. Grossman among 5,749 specialist records in California
Marc A. Grossman, M.D. is one of 5,749 specialist records with a practice address in California. 30% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileNo · 19% of these records are
- Record last updated2007 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in Brea → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Frederic Corbin, M.D.Brea, CA 928211114007168
- Maria Esquivel OrtizBrea, CA 928211093265712
- Changnin Lee, M.D.Brea, CA 928211427239128
- Katya MartinezBrea, CA 928211710341672
- Beverly Hendricks, COTA/CFullerton, CA 928311174769525
- Ryan Hunter, BSFullerton, CA 928311629122353
- Audrey O'NeillFullerton, CA 928311730536871
- Lynda Trachtman, PTFullerton, CA 928311407068984
Common questions
What is Marc A. Grossman, M.D.'s NPI number?
Marc A. Grossman, M.D.'s National Provider Identifier (NPI) is 1033216577, issued on Sep 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marc A. Grossman, M.D. located?
The NPPES record lists a practice address at 340 W Central Ave, Brea, CA, 92821. Phone: (714) 529-1421. Providers update this record themselves, so call before visiting.
How can I verify Marc A. Grossman, M.D.'s license?
NPPES lists California license number G42011, 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. 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.