Barry Allswang, MD
Internal Medicine Physician · Los Alamitos, CA
Barry Allswang, MD is an internal medicine physician with a practice address in Los Alamitos, California, and NPI 1720016397, issued on Jun 30, 2006. Check the license (California G34791, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Barry Allswang
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G34791 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3801 Katella Ave, Los Alamitos, CA 90720
- Phone
- (562) 594-9546
- Enumerated
- Jun 30, 2006
- Entity
- Type 1 · individual
Also registered at 3801 Katella Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Barry Allswang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G34791Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
129 Medicare Part D claims for 60 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate15 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.
44 internal medicine physician records list a Los Alamitos practice address
They are 44 of the 1,035 NPPES records with a Los Alamitos practice address, and 20,403 internal medicine physician records in California.
All 44 in Los Alamitos → All 20,403 in California → Every provider in Los Alamitos →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Barry Allswang, MD's NPI number?
Barry Allswang, MD's National Provider Identifier (NPI) is 1720016397, issued on Jun 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Barry Allswang, MD located?
The NPPES record lists a practice address at 3801 Katella Ave, Los Alamitos, CA, 90720. Phone: (562) 594-9546. Providers update this record themselves, so call before visiting.
How can I verify Barry Allswang, MD's license?
NPPES lists California license number G34791, 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.
How much does Barry Allswang, MD prescribe under Medicare Part D?
In 2024, Barry Allswang, MD had 129 Medicare Part D claims for 60 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.