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Dr. Matthew J. Kaptein, MD
NPI1184995094PAC ID8325328941
- Medicare services, 2024
- 1,011
- Medicare patients, 2024
- 306
- Part D claims, 2024
- 1,044
- Publications
- 4
- MIPS score, 2024
- 89
- Practice address
- 11375 Anderson St, Loma Linda, CA 92354
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Loma Linda Univ Kidney Center - HOPD
Acute Care Hospital outpatient department · Loma Linda, California
Find Dr. Kaptein's professional email, personal email and mobile number
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Dr. Matthew J. Kaptein is a nephrologist in Loma Linda, California
Dr. Kaptein practices at Loma Linda Univ Kidney Center - HOPD in Loma Linda, California.
Dr. Kaptein's NPI, 1184995094, was assigned on January 24, 2012. Dr. Kaptein graduated from Keck School of Medicine of USC in 2011. Dr. Kaptein holds California license A125084.
NPI and contact details
- NPI
- 1184995094NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8325328941
- NPI enumeration date
- January 24, 2012
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Matthew J. Kaptein practices at Loma Linda Univ Kidney Center - HOPD in Loma Linda, California
Dr. Kaptein's primary practice is Loma Linda Univ Kidney Center - HOPD, at 11375 Anderson St, Loma Linda, CA 92354.
- Loma Linda Univ Kidney Center - HOPD11375 Anderson St, Loma Linda, CA 92354
Source: Dmand AI Affiliation Data
Dr. Matthew J. Kaptein is affiliated with 4 sites of care and 3 medical groups
Dr. Kaptein's primary practice is Loma Linda Univ Kidney Center - HOPD in Loma Linda, California. Dr. Kaptein is also affiliated with Loma Linda University Medical Center. The medical group on file is Loma Linda University Faculty Medical Group (LLUFMG). Dmand AI also links Dr. Kaptein to 2 more dialysis centers and 2 medical groups, each named with a free account. Dr. Kaptein's employer is on file too: a hospital.
Loma Linda Univ Kidney Center - HOPDPrimary
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Matthew J. Kaptein's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Kaptein practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Loma Linda Univ Kidney Center - HOPD | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Matthew J. Kaptein is one of 1,401 nephrologists in California
Nephrology is Dr. Kaptein's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Kaptein is board certified in internal medicine by the American Board of Internal Medicine. Dr. Kaptein is licensed in California.
Specialties and state licenses
- Nephrology, CaliforniaPrimary
Clinical focus
Dmand AI lists acute kidney failure, chronic kidney disease and fluid and electrolyte imbalances among the conditions Dr. Kaptein treats.
Nephrologists near Dr. Kaptein
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Matthew J. Kaptein billed Medicare for 1,011 services in 2024
CMS data shows 1,011 Medicare services from Dr. Kaptein across 11 procedure codes in 2024, for 306 Medicare patients. Medicare paid $98,182 for them.
Medicare services, 20241,011
Medicare patients306
Paid by Medicare$98,182
Procedure codes11
Dr. Kaptein's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4672024: 62734%
- Tests and treatments
- 2023: 2132024: 24113%
- Other services
- 2023: 02024: 143
Where Dr. Kaptein's Medicare services took place, 2024
- In an office53253%
- In a facility47947%
Dr. Kaptein compared with the California median for nephrologists, 2024
- Dr. Kaptein
- California median
- Medicare services
- 1,011vs 1,0847% below
- Medicare patients
- 306vs 307Close to median
- Part D claims
- 839vs 95512% below
Medians across 1,355 nephrologists in California with Dmand AI profiles that report each measure.
Dr. Kaptein's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Kaptein and other nephrologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Matthew J. Kaptein treated 306 Medicare patients in 2024, average age 67
CMS counts 306 Medicare patients who saw Dr. Kaptein in 2024. The largest group is 65 to 74, with 117 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 55% are also on Medicaid. Their average risk score is 5.51, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Kaptein's median patient age at 64, with 53% women.
Medicare patients, 2024306
Average age67
Average risk score5.51
Also on Medicaid55%
Dr. Kaptein's Medicare patients by age, 2024
Dr. Kaptein's Medicare patients by sex, 2024
- Women15952%
- Men14748%
Chronic conditions among Dr. Kaptein's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes62%
- Heart failure61%
- Arthritis50%
- Ischemic heart disease48%
- Atrial fibrillation35%
Share of Medicare patients with each condition. A patient can have several.
Dr. Kaptein's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Matthew J. Kaptein wrote 1,044 Medicare Part D claims in 2024
In 2024, Dr. Kaptein wrote 1,044 Medicare Part D claims for 178 patients. 80% of them were for generic drugs. CMS names the drug for 839 of them, across 25 drugs with 11 or more claims each, at $196,159 in total drug cost. In 2023, CMS named 437 claims across 15 drugs.
Part D claims, 20241,044
Drugs named by CMS25
Total drug cost$196,159
Part D patients178
Dr. Kaptein's Part D claims by kind of drug, 2024
- Generic830 claims80%
- Brand-name and other214 claims20%
Dr. Kaptein's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Kaptein's Part D claims, 2024
- Antibiotics2%23 of 1,044 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4372024: 83992%
Drugs named by CMS: 25 in 2024, 15 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Matthew J. Kaptein scored 89 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 89 out of 100 for Dr. Kaptein for performance year 2024, reported as part of a group. Dr. Kaptein accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Kaptein as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Kaptein's MIPS scores, performance year 2024
- 89of 100Final score
- 72.1of 100Quality
- 80of 100Promoting Interoperability
- 40of 100Improvement Activities
- 77of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Matthew J. Kaptein has 4 publications on record
Dmand AI links 4 papers to Dr. Kaptein, published from 2014 to 2016. Dr. Kaptein's most frequent co-author is Elaine M. Kaptein, MD.
Papers4
Years published2014 to 2016
Dr. Kaptein's most frequent co-authors
Recent publications by Dr. Kaptein
See who Dr. Kaptein researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Kaptein works with, so you can find a warm path to the right nephrologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Matthew J. Kaptein received $380 in industry payments from 2019 to 2025
CMS Open Payments shows 4 general payments to Dr. Kaptein from 3 drug and device companies from 2019 to 2025. Food and beverage make up the largest share, 100% of the total. C. R. Bard, Inc. & Subsidiaries paid the most, $230.
General payments to Dr. Kaptein by program year, 2019 to 2025
Companies that paid Dr. Kaptein the most, 2019 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Matthew J. Kaptein graduated from Keck School of Medicine of USC
Dr. Kaptein graduated from Keck School of Medicine of USC in 2011.
- Medical school
- Board certified in internal medicine
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. Matthew J. Kaptein accepts plans from 8 insurance carriers
Dr. Kaptein is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Molina
- Regence Health Plans
- CMS Medicare
- NV State Medicaid
Plan types Dr. Kaptein accepts, by number of carriers
- Medicare7
- PPO5
- HMO3
- POS2
- EPO1
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Matthew J. Kaptein's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Matthew J. Kaptein
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Matthew J. Kaptein's NPI number?
Dr. Matthew J. Kaptein's NPI number is 1184995094. It was assigned on January 24, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. Matthew J. Kaptein?
Dr. Matthew J. Kaptein is a nephrologist in Loma Linda, California. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Matthew J. Kaptein practice?
Dr. Kaptein practices at 11375 Anderson St, Loma Linda, CA 92354. Dr. Kaptein's primary practice is Loma Linda Univ Kidney Center - HOPD in Loma Linda, California. Dmand AI also links Dr. Kaptein to 2 dialysis centers and 2 medical groups.
What is Dr. Matthew J. Kaptein's medical license number?
Dr. Kaptein holds California license A125084.
Which hospitals is Dr. Matthew J. Kaptein affiliated with?
Dr. Kaptein is affiliated with Loma Linda University Medical Center.
What medical group is Dr. Matthew J. Kaptein part of?
Dr. Kaptein is linked to Loma Linda University Faculty Medical Group (LLUFMG). Dmand AI links Dr. Kaptein to 2 more medical groups.
Does Dr. Matthew J. Kaptein accept Medicare?
Yes. CMS data shows Dr. Kaptein billed Medicare for 1,011 services in 2024, and Dr. Kaptein accepts Medicare assignment.
Does Dr. Matthew J. Kaptein offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Kaptein as offering telehealth services.
What is Dr. Matthew J. Kaptein's MIPS score?
Dr. Kaptein's MIPS final score for performance year 2024 is 89 out of 100, reported as part of a group.
How many Medicare patients does Dr. Matthew J. Kaptein see?
CMS counts 306 Medicare patients who saw Dr. Kaptein in 2024, with an average age of 67.
Show 9 more questionsShow fewer questions
Is Dr. Matthew J. Kaptein board certified?
Yes. Dr. Kaptein is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Matthew J. Kaptein bill to Medicare?
In 2024, Dr. Kaptein's most billed Medicare services were hospital inpatient care (99232), office visit, established patient (99214) and medicare service (G2211).
Where did Dr. Matthew J. Kaptein go to medical school?
Dr. Kaptein graduated from Keck School of Medicine of USC in 2011.
What drugs does Dr. Matthew J. Kaptein prescribe most?
In 2024 Medicare Part D data, Dr. Kaptein's most prescribed drugs by claims were Losartan Potassium, Amlodipine Besylate and Calcitriol.
Has Dr. Matthew J. Kaptein received payments from drug or device companies?
CMS Open Payments shows $380 in general payments to Dr. Kaptein from 3 companies from 2019 to 2025. The largest total came from C. R. Bard, Inc. & Subsidiaries.
How long has Dr. Matthew J. Kaptein been practicing?
Dr. Kaptein graduated from medical school in 2011, 15 years ago.
Does Dr. Matthew J. Kaptein do research?
Dmand AI links 4 publications to Dr. Kaptein, published from 2014 to 2016.
Who does Dr. Matthew J. Kaptein publish with?
Dr. Kaptein's most frequent co-authors are Elaine M. Kaptein, MD (3 shared papers).
What insurance does Dr. Matthew J. Kaptein accept?
Dr. Kaptein is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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