Michael Arnstein, M.D.
Specialist · Torrance, CA
Michael Arnstein, M.D. is a specialist with a practice address in Torrance, California, and NPI 1821000100, issued on Aug 13, 2006. Check the license (California G80314, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Michael Arnstein
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- G80314 CA
Self-reported in NPPES; status is on the state search - Practice location
- 22930 Crenshaw Blvd Ste D, Torrance, CA 90505
- Phone
- (310) 530-4200
- Enumerated
- Aug 13, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (310) 530-1562
- Medicaid ID
- 00G803140 CA
- Medicare enrollment
- Enrolled (PECOS I20090709000040); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 1987
- Entity
- Type 1 · individual
Also registered at 22930 Crenshaw Blvd Ste D
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Black, M.D.Specialist1821000191
- John Boyd, M.D.Specialist1083626238
Verify Michael Arnstein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G80314Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average specialist in 2024
123 Medicare Part D claims for 56 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Sulfamethoxazole-Trimethoprim30 claims
- Mupirocin23 claims
- Doxycycline Hyclate13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $4,229.66
61 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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.
Bills Medicare through 2 group practices
- Alamitos Dermatological Medical Clinic A Professional CorpHuntington Beach, CA
- Medlink MobileVan Nuys, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
Other specialist records in California
- Fatemeh Abbasi, PTVan Nuys, CA1558496760
- Erlinda Abcede, M.D.Cudahy, CA1831228675
- Maher Abdallah, M.D.Palm Springs, CA1205988011
- Farinaz AbdiSan Marcos, CA1063153963
- Mai Abe, LESanta Monica, CA1609405158
- Hamid Abedi, HEARING AID SPECIALISan Diego, CA1659410744
- Jonas AbellaSan Francisco, CA1679760938
- Shreedhar Abhyankar, M.D.Indio, CA1861530669
- Elaine AbichRiverside, CA1780458927
- Mussarat Abidi, MDLadera Ranch, CA1053307769
Common questions
What is Michael Arnstein, M.D.'s NPI number?
Michael Arnstein, M.D.'s National Provider Identifier (NPI) is 1821000100, issued on Aug 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael Arnstein, M.D. located?
The NPPES record lists a practice address at 22930 Crenshaw Blvd Ste D, Torrance, CA, 90505. Phone: (310) 530-4200. Providers update this record themselves, so call before visiting.
How can I verify Michael Arnstein, M.D.'s license?
NPPES lists California license number G80314, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Michael Arnstein, M.D. prescribe under Medicare Part D?
In 2024, Michael Arnstein, M.D. had 123 Medicare Part D claims for 56 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions 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.