James Amster, M.D.
Neuroradiology Physician · Signal Hill, CA
James Amster, M.D. is a neuroradiology physician with a practice address in Signal Hill, California, and NPI 1366491623, issued on May 6, 2006. Check the license (California G49317, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Amster
- Credential
- M.D.
- Primary taxonomy
- Neuroradiology Physician 2085N0700X
- License number
- G49317 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2708 E Willow St, Signal Hill, CA 90755
- Phone
- (562) 216-5120
- Enumerated
- May 6, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (562) 216-5121
- Entity
- Type 1 · individual
8 nearest neuroradiology physician records → All 221 in California → Look up another NPI →
Also registered at 2708 E Willow St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeffrey Dobkin, MDNuclear Radiology Physician1215919147
- Kay Yan, M.D.Diagnostic Radiology Physician1417905118
Verify James Amster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G49317Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 91.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
James Amster among 221 neuroradiology physician records in California
James Amster, M.D. is one of 221 neuroradiology physician records with a practice address in California. 82% 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, 62% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 78% of these records are
- Record last updated2026 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085N0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neuroradiology Physician providers in California
There are 221 neuroradiology physician records in California.
All 221 in California → Every provider in Signal Hill → Neuroradiology Physician nationwide →
The 8 neuroradiology physician records with the nearest ZIP codes
- Dianna Chooljian, MD PHD MPHLong Beach, CA 908061902888043
- Karen Ragland, MDLong Beach, CA 908061669454823
- Frances Chiang, MDTorrance, CA 905091083835037
- Juan Lozano, MDTorrance, CA 905031871750604
- Christopher Putman, MDTorrance, CA 905031942228960
- Jason Tarpley, M.D., PH.D.Torrance, CA 905031871812495
- Charles Mehringer, M.D.Torrance, CA 905021487695136
- Anton Mlikotic, M.D.Torrance, CA 905021316989890
Common questions
What is James Amster, M.D.'s NPI number?
James Amster, M.D.'s National Provider Identifier (NPI) is 1366491623, issued on May 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James Amster, M.D. located?
The NPPES record lists a practice address at 2708 E Willow St, Signal Hill, CA, 90755. Phone: (562) 216-5120. Providers update this record themselves, so call before visiting.
How can I verify James Amster, M.D.'s license?
NPPES lists California license number G49317, 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.
What is James Amster, M.D.'s MIPS final score?
The 2023 MIPS final score is 91.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.