Dr. Renier J. Brentjens, MD
- Medicare services, 2021
- 19
- Part D claims, 2021
- 71
- Hospital affiliations
- 1
- Industry payments
- $3,922
- Medical groups
- 2
- Practice address
- 1275 York Ave, New York, NY 10021
- Practice phone
- Call (212) 639-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Memorial Hematology Lymphoma Group - Primary Care - New York (York Ave)
Primary care practice · New York, New York
Find Dr. Brentjens' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Renier J. Brentjens is an internist in Los Angeles, California
Dr. Brentjens practices at Memorial Hematology Lymphoma Group - Primary Care - New York (York Ave) in New York, New York.
Dr. Brentjens' NPI, 1588635510, was assigned on January 28, 2006. Dr. Brentjens holds New York license 209957.
- NPI
- 1588635510NPI Registry (opens in a new tab)
- NPI enumeration date
- January 28, 2006
- NPI status
- Active
- Practice phone
- (212) 639-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Renier J. Brentjens practices in New York and Los Angeles
Dr. Brentjens' primary practice is Memorial Hematology Lymphoma Group - Primary Care - New York (York Ave), at 1275 York Ave, New York, NY 10021. The practice phone is (212) 639-2000. The NPI Registry lists Dr. Brentjens' practice address as 344 S Hauser Blvd, Los Angeles, CA 90036.
- Memorial Hematology Lymphoma Group - Primary Care - New York (York Ave)Primary1275 York Ave, New York, NY 10021Phone(212) 639-2000
- NPI Registry address344 S Hauser Blvd, Los Angeles, CA 90036 · Los Angeles CountyPhone(646) 227-3813
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Renier J. Brentjens is affiliated with 2 sites of care and 2 medical groups
Dr. Brentjens' primary practice is Memorial Hematology Lymphoma Group - Primary Care - New York (York Ave) in New York, New York. Dr. Brentjens is also affiliated with Roswell Park Comprehensive Cancer Center. The medical group on file is Roswell Park Comprehensive Cancer Center. Dmand AI also links Dr. Brentjens to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Renier J. Brentjens' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Brentjens practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Memorial Hematology Lymphoma Group - Primary Care - New York (York Ave) | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Renier J. Brentjens is one of 16,751 internists in California
Internal medicine is Dr. Brentjens' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Brentjens is licensed in New York.
Specialties and state licenses
- Internal medicine, New YorkPrimary
Internists near Dr. Brentjens
Counts of internists 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. Renier J. Brentjens billed Medicare for 19 services in 2021
CMS data shows 19 Medicare services from Dr. Brentjens across 1 procedure code in 2021, all of them office visits. Medicare paid $1,488 for them. Every service was in an office.
Dr. Brentjens' Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 2092021: 1991%
Dr. Brentjens compared with the California median for internists, 2021
- Dr. Brentjens
- California median
- Medicare services
- 19vs 36195% below
- Part D claims
- 71vs 42183% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Brentjens' most billed Medicare procedure codes, 2021
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. Brentjens and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Renier J. Brentjens wrote 71 Medicare Part D claims in 2021
In 2021, Dr. Brentjens wrote 71 Medicare Part D claims. They cover 4 drugs, with $614,620 in total drug cost. In 2020, CMS named 102 claims across 4 drugs.
Dr. Brentjens' most prescribed drugs by claims, 2021
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 1022021: 7130%
Drugs named by CMS: 4 in 2021, 4 in 2020.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Renier J. Brentjens received $3,922 in industry payments from 2018 to 2025
CMS Open Payments shows 17 general payments to Dr. Brentjens from 6 drug and device companies from 2018 to 2025. Travel and lodging make up the largest share, 44% of the total. Celgene Corporation paid the most, $1,500.
General payments to Dr. Brentjens by program year, 2018 to 2025
General payments to Dr. Brentjens by kind, 2018 to 2025
- Travel and lodging$1,72344%
- Consulting fees$1,50038%
- Food and beverage$69918%
Companies that paid Dr. Brentjens the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Renier J. Brentjens'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Renier J. Brentjens
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. Renier J. Brentjens' NPI number?
Dr. Renier J. Brentjens' NPI number is 1588635510. It was assigned on January 28, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Renier J. Brentjens?
Dr. Renier J. Brentjens is an internist in Los Angeles, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Renier J. Brentjens practice?
Dr. Brentjens practices at 1275 York Ave, New York, NY 10021. Dr. Brentjens also practices at 344 S Hauser Blvd, Los Angeles, CA 90036. Dr. Brentjens' primary practice is Memorial Hematology Lymphoma Group - Primary Care - New York (York Ave) in New York, New York. Dmand AI also links Dr. Brentjens to 1 medical group.
What is Dr. Renier J. Brentjens' office phone number?
The practice phone on file for Dr. Brentjens is (212) 639-2000.
What is Dr. Renier J. Brentjens' medical license number?
Dr. Brentjens holds New York license 209957.
Which hospitals is Dr. Renier J. Brentjens affiliated with?
Dr. Brentjens is affiliated with Roswell Park Comprehensive Cancer Center.
What medical group is Dr. Renier J. Brentjens part of?
Dr. Brentjens is linked to Roswell Park Comprehensive Cancer Center. Dmand AI links Dr. Brentjens to 1 more medical group.
Does Dr. Renier J. Brentjens accept Medicare?
Yes. CMS data shows Dr. Brentjens billed Medicare for 19 services in 2021.
What services does Dr. Renier J. Brentjens bill to Medicare?
In 2021, Dr. Brentjens' most billed Medicare services were office visit, established patient (99214).
What drugs does Dr. Renier J. Brentjens prescribe most?
In 2021 Medicare Part D data, Dr. Brentjens' most prescribed drugs by claims were Imbruvica, Imatinib Mesylate and Gleevec.
Has Dr. Renier J. Brentjens received payments from drug or device companies?
CMS Open Payments shows $3,922 in general payments to Dr. Brentjens from 6 companies from 2018 to 2025. The largest total came from Celgene Corporation.
How long has Dr. Renier J. Brentjens been practicing?
Dr. Brentjens' NPI was assigned in 2006.
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