Gregory Michael Nicholson, M.D.
Psychiatry Physician · Norwalk, CA
Gregory Michael Nicholson, M.D. is a psychiatry physician with a practice address in Norwalk, California, and NPI 1851489868, issued on Oct 11, 2006. Check the license (California A86080, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory Michael Nicholson
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A86080 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11401 Bloomfield Ave, Norwalk, CA 90650
- Phone
- (562) 863-7011
- Enumerated
- Oct 11, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (562) 864-4560
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 11401 Bloomfield Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bruce Abrams, MDPsychiatry Physician1972602753
- Camille Ace, PSY.D.Psychologist1740317650
- Arshad Ali, M.D.Psychiatry Physician1982834883
- Amaogechukwu Alugbue, NPFamily Nurse Practitioner1356123160
- Jaydina Amaker, PSY.D.Psychologist1952967341
- Ranjan Amin, M.D.Psychiatry Physician1659301489
Verify Gregory Michael Nicholson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A86080Check 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: $49.86
1 payment: food and beverage; the largest payer was Stryker Corporation. The 13,693 providers of this specialty with any payment received $4,954.93 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.
Gregory Michael Nicholson among 8,673 psychiatry physician records in California
Gregory Michael Nicholson, M.D. is one of 8,673 psychiatry physician 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. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 67% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2007 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
57 psychiatry physician records list a practice address in Norwalk
They are 57 of the 1,600 NPPES records with a practice address in Norwalk, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Norwalk → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Harun Aslam, MDNorwalk, CA 906501417903006
- Rebecca Avena-Gonzales, MDNorwalk, CA 906501487600045
- Samia Boshra, MDNorwalk, CA 906501285680744
- Isaac Browne, MDNorwalk, CA 906501346296704
- Laura Dardashti, MDNorwalk, CA 906501558317685
- Thein Han, M.D.Norwalk, CA 906501760457808
- Ehab Hanna, M.D.Norwalk, CA 906501972500403
- Ashraf Helmy, M.D.Norwalk, CA 906501790753234
Common questions
What is Gregory Michael Nicholson, M.D.'s NPI number?
Gregory Michael Nicholson, M.D.'s National Provider Identifier (NPI) is 1851489868, issued on Oct 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Michael Nicholson, M.D. located?
The NPPES record lists a practice address at 11401 Bloomfield Ave, Norwalk, CA, 90650. Phone: (562) 863-7011. Providers update this record themselves, so call before visiting.
How can I verify Gregory Michael Nicholson, M.D.'s license?
NPPES lists California license number A86080, 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.