Matthew Kaptein, M.D.
Nephrology Physician · Loma Linda, CA
Matthew Kaptein, M.D. is a nephrology physician with a practice address in Loma Linda, California, and NPI 1184995094, issued on Jan 24, 2012. Check the license (California A125084, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Matthew Kaptein
- Credential
- M.D.
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- A125084 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11234 Anderson St, Loma Linda, CA 92354
- Phone
- (909) 558-4906
- Enumerated
- Jan 24, 2012
- Record last updated
- Dec 20, 2023
- Fax
- (909) 558-0396
- Medicare enrollment
- Enrolled (PECOS I20161216000940); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 2011
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 11234 Anderson St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Faiz Abdur-Rahman, MDStudent in an Organized Health Care Education/Training Program1144073768
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- Adina Achiriloaie, MDDiagnostic Neuroimaging (Radiology) Physician1992983282
- Ana Acosta, MDStudent in an Organized Health Care Education/Training Program1265179774
Verify Matthew Kaptein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A125084Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
29% fewer Medicare Part D claims than the average nephrology physician in 2024
1,044 Medicare Part D claims for 178 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Losartan Potassium118 claims
- Amlodipine Besylate79 claims
- Calcitriol79 claims
- Farxiga67 claims
- Carvedilol61 claims
- Nifedipine Er45 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): 85.2 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).
Bills Medicare through 2 group practices
- Faculty Physicians And Surgeons OF LlusmLoma Linda, CA
- Sac Health SystemSan Bernardino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Matthew Kaptein among 1,468 nephrology physician records in California
Matthew Kaptein, M.D. is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 80% of them.
- NPI issued2012 · 80% of these records are older, 17% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2011 · median 2001 among the 1,128 with a school on file
- Record last updated2023 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Loma Linda → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Amir Abdi Pour, MDLoma Linda, CA 923541912187477
- Afshin Ahoubim, M.DLoma Linda, CA 923541932513488
- Jasjot Bhullar, M.D.Loma Linda, CA 923541366602229
- Alfred Cottrell, M.D.Loma Linda, CA 923541609893809
- Lakshmi GanesanLoma Linda, CA 923541821356288
- Thanh Hoang, M.D.Loma Linda, CA 923541992818892
- Melin Narayan, M.D.,Loma Linda, CA 923541710291869
- Sayna Norouzi, M.D.Loma Linda, CA 923541649666041
Common questions
What is Matthew Kaptein, M.D.'s NPI number?
Matthew Kaptein, M.D.'s National Provider Identifier (NPI) is 1184995094, issued on Jan 24, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Matthew Kaptein, M.D. located?
The NPPES record lists a practice address at 11234 Anderson St, Loma Linda, CA, 92354. Phone: (909) 558-4906. Providers update this record themselves, so call before visiting.
How can I verify Matthew Kaptein, M.D.'s license?
NPPES lists California license number A125084, 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 Matthew Kaptein, M.D. prescribe under Medicare Part D?
In 2024, Matthew Kaptein, M.D. had 1,044 Medicare Part D claims for 178 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
What is Matthew Kaptein, M.D.'s MIPS final score?
The 2023 MIPS final score is 85.2 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.