Justin Allan Mauser, M.D.
Family Medicine Physician · Long Beach, CA
Justin Allan Mauser, M.D. is a family medicine physician with a practice address in Long Beach, California, and NPI 1134624398, issued on Mar 28, 2018. Check the license (California A164474, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Justin Allan Mauser
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A164474 CA
Self-reported in NPPES; status is on the state search - Practice location
- 450 E Spring St Ste 1, Long Beach, CA 90806
- Phone
- (562) 933-0050
- Enumerated
- Mar 28, 2018
- Record last updated
- Mar 25, 2024
- Fax
- (562) 933-0079
- Medicare enrollment
- Enrolled (PECOS I20210714000452); accepts Medicare assignment
- Medical or professional school
- Virginia Commonwealth University, School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 450 E Spring St Ste 1
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Alexander Alvarez, MD, PHDFamily Medicine Physician1104528827
- Dristi Angdembey, MDStudent in an Organized Health Care Education/Training Program1699418590
- Emma AsherStudent in an Organized Health Care Education/Training Program1053250761
- Lauren Barnes, M.D.Family Medicine Physician1376789131
- Valerie BursteinFamily Medicine Physician1790313716
Verify Justin Allan Mauser in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A164474Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average family medicine physician in 2024
754 Medicare Part D claims for 448 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Azithromycin69 claims
- Albuterol Sulfate Hfa64 claims
- Amoxicillin52 claims
- Prednisone41 claims
- Doxycycline Monohydrate37 claims
- Amoxicillin-Clavulanate Potass35 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 76.7 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).
Bills Medicare through one group practice
- Southern California Permanente Medical GroupHarbor City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Justin Allan Mauser among 17,133 family medicine physician records in California
Justin Allan Mauser, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 82% of them.
- NPI issued2018 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2018 · median 2005 among the 10,652 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
213 family medicine physician records list a practice address in Long Beach
They are 213 of the 13,650 NPPES records with a practice address in Long Beach, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Long Beach → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Ellen Amador, D.O.Long Beach, CA 908061336244847
- Dedra Beckles, M.D.Long Beach, CA 908061821011339
- Charles Clark, M.D.Long Beach, CA 908061669490272
- Carrie Fields, D.O.Long Beach, CA 908061760588420
- Cynthia Herzog, M.D.Long Beach, CA 908061588760227
- Joseph Keichline, M.D.Long Beach, CA 908061467540765
- Brooke Laduca, MDLong Beach, CA 908061790704864
- Andrew Manos, D.O.Long Beach, CA 908061821153602
Common questions
What is Justin Allan Mauser, M.D.'s NPI number?
Justin Allan Mauser, M.D.'s National Provider Identifier (NPI) is 1134624398, issued on Mar 28, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Justin Allan Mauser, M.D. located?
The NPPES record lists a practice address at 450 E Spring St Ste 1, Long Beach, CA, 90806. Phone: (562) 933-0050. Providers update this record themselves, so call before visiting.
How can I verify Justin Allan Mauser, M.D.'s license?
NPPES lists California license number A164474, 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 Justin Allan Mauser, M.D. prescribe under Medicare Part D?
In 2024, Justin Allan Mauser, M.D. had 754 Medicare Part D claims for 448 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Justin Allan Mauser, M.D.'s MIPS final score?
The 2023 MIPS final score is 76.7 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.