Dr. Ruijun Chen, MD
- Medicare services, 2024
- 130
- Medicare patients, 2024
- 67
- Part D claims, 2024
- 28
- MIPS score, 2024
- 100
- Hospital affiliations
- 1
- Practice address
- 94 Old Short Hills Rd, Livingston, NJ 07039
- Practice phone
- Call (973) 322-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Cooperman Barnabas Medical Center
Livingston, New Jersey
Find Dr. Chen's professional email, personal email and mobile number
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Dr. Ruijun Chen is a hospitalist in Livingston, New Jersey
Dr. Chen practices at Cooperman Barnabas Medical Center in Livingston, New Jersey.
Dr. Chen's NPI, 1619395225, was assigned on April 1, 2014. Dr. Chen graduated from Yale School of Medicine in 2014. Dr. Chen holds New York license 288983.
- NPI
- 1619395225NPI Registry (opens in a new tab)
- NPI enumeration date
- April 1, 2014
- NPI status
- Active
- Practice phone
- (973) 322-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Ruijun Chen practices at Cooperman Barnabas Medical Center in Livingston, New Jersey
Dr. Chen's primary practice is Cooperman Barnabas Medical Center, at 94 Old Short Hills Rd, Livingston, NJ 07039 in Essex County. The practice phone is (973) 322-5000.
- Cooperman Barnabas Medical Center94 Old Short Hills Rd, Livingston, NJ 07039 · Essex CountyPhone(973) 322-5000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Ruijun Chen is affiliated with 2 sites of care and 2 medical groups
Dr. Chen's primary practice is Cooperman Barnabas Medical Center in Livingston, New Jersey. Dr. Chen is also affiliated with NewYork-Presbyterian/Weill Cornell Medical Center. The medical group on file is RWJBarnabas Health Medical Group. Dmand AI also links Dr. Chen to 1 more medical group, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Ruijun Chen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Cooperman Barnabas Medical Center | 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. Ruijun Chen is one of 610 hospitalists in New Jersey
Hospitalist is Dr. Chen's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dmand AI has Dr. Chen's licenses on file in 2 states: New York and Pennsylvania.
Specialties and state licenses
- Hospitalist, New YorkPrimary
- Pennsylvania license
Hospitalists near Dr. Chen
Counts of hospitalists 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. Ruijun Chen billed Medicare for 130 services in 2024
CMS data shows 130 Medicare services from Dr. Chen across 3 procedure codes in 2024, for 67 Medicare patients. Medicare paid $12,688 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Chen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 602024: 130117%
Dr. Chen compared with the New Jersey median for hospitalists, 2024
- Dr. Chen
- New Jersey median
- Medicare services
- 130vs 65280% below
- Medicare patients
- 67vs 29177% below
- Part D claims
- 11vs 9188% below
Medians across 548 hospitalists in New Jersey with Dmand AI profiles that report each measure.
Dr. Chen'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ruijun Chen treated 67 Medicare patients in 2024, average age 75
CMS counts 67 Medicare patients who saw Dr. Chen in 2024. The largest group is 65 to 74, with 21 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 18% are also on Medicaid. Their average risk score is 3.11, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Dr. Chen's Medicare patients by age, 2024
Dr. Chen's Medicare patients by sex, 2024
- Women3349%
- Men3451%
Chronic conditions among Dr. Chen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis61%
- Diabetes54%
- Ischemic heart disease54%
- Heart failure51%
- Mood disorders51%
- Anxiety49%
Share of Medicare patients with each condition. A patient can have several.
Source: Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Ruijun Chen wrote 28 Medicare Part D claims in 2024
In 2024, Dr. Chen wrote 28 Medicare Part D claims. 86% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $66 in total drug cost.
Dr. Chen's Part D claims by kind of drug, 2024
- Generic24 claims86%
- Brand-name and other4 claims14%
Dr. Chen'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.
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. Ruijun Chen scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Chen for performance year 2024, reported through an alternative payment model (APM).
Dr. Chen's MIPS scores, performance year 2024
- 100of 100Final score
- 85.3of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Ruijun Chen graduated from Yale School of Medicine
Dr. Chen graduated from Yale School of Medicine in 2014.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Ruijun Chen'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 Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy 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 | Medicare 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 | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Ruijun Chen
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. Ruijun Chen's NPI number?
Dr. Ruijun Chen's NPI number is 1619395225. It was assigned on April 1, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. Ruijun Chen?
Dr. Ruijun Chen is a hospitalist in Livingston, New Jersey. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Ruijun Chen practice?
Dr. Chen practices at 94 Old Short Hills Rd, Livingston, NJ 07039. Dr. Chen's primary practice is Cooperman Barnabas Medical Center in Livingston, New Jersey. Dmand AI also links Dr. Chen to 1 medical group.
What is Dr. Ruijun Chen's office phone number?
The practice phone on file for Dr. Chen is (973) 322-5000.
What is Dr. Ruijun Chen's medical license number?
Dr. Chen holds New York license 288983, one of the licenses on file in 2 states.
Which states has Dr. Ruijun Chen been licensed in?
Dmand AI has state licenses on file for Dr. Chen in New York and Pennsylvania.
Which hospitals is Dr. Ruijun Chen affiliated with?
Dr. Chen is affiliated with NewYork-Presbyterian/Weill Cornell Medical Center.
What medical group is Dr. Ruijun Chen part of?
Dr. Chen is linked to RWJBarnabas Health Medical Group. Dmand AI links Dr. Chen to 1 more medical group.
Does Dr. Ruijun Chen accept Medicare?
Yes. CMS data shows Dr. Chen billed Medicare for 130 services in 2024.
What is Dr. Ruijun Chen's MIPS score?
Dr. Chen's MIPS final score for performance year 2024 is 100 out of 100, reported through an alternative payment model (APM).
Show 5 more questionsShow fewer questions
How many Medicare patients does Dr. Ruijun Chen see?
CMS counts 67 Medicare patients who saw Dr. Chen in 2024, with an average age of 75.
What services does Dr. Ruijun Chen bill to Medicare?
In 2024, Dr. Chen's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).
Where did Dr. Ruijun Chen go to medical school?
Dr. Chen graduated from Yale School of Medicine in 2014.
What drugs does Dr. Ruijun Chen prescribe most?
In 2024 Medicare Part D data, Dr. Chen's most prescribed drugs by claims were Pantoprazole Sodium.
How long has Dr. Ruijun Chen been practicing?
Dr. Chen graduated from medical school in 2014, 12 years ago.
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