Dr. Robert Ra Nien Tseng, MD
- Medicare services, 2024
- 2,425
- Medicare patients, 2024
- 514
- Part D claims, 2024
- 2,911
- MIPS score, 2024
- 100
- Hospital affiliations
- 6
- Practice address
- 2222 East St, Concord, CA 94520
- Practice phone
- Call (925) 691-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Premier Surgery Center
Concord, California
Find Dr. Tseng's 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. Robert Ra Nien Tseng is a nephrologist in Concord, California
Dr. Tseng practices at Premier Surgery Center in Concord, California.
Dr. Tseng's NPI, 1053371559, was assigned on March 27, 2006. Dr. Tseng graduated from Drexel University College Of Medicine in 1997. Dr. Tseng holds California license A66496.
- NPI
- 1053371559NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2466488390
- NPI enumeration date
- March 27, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (925) 691-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 55
- Medical school graduation
- 1997
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Robert Ra Nien Tseng practices at Premier Surgery Center in Concord, California
Dr. Tseng's primary practice is Premier Surgery Center, at 2222 East St, Concord, CA 94520 in Contra Costa County. The practice phone is (925) 691-5000.
- Premier Surgery Center2222 East St, Concord, CA 94520 · Contra Costa CountyPhone(925) 691-5000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Robert Ra Nien Tseng is affiliated with 14 sites of care and 5 medical groups
Dr. Tseng's primary practice is Premier Surgery Center in Concord, California. Dr. Tseng is also affiliated with Mills-Peninsula Medical Center. The medical group on file is West Coast Kidney Institute. Dmand AI also links Dr. Tseng to 5 more hospitals, 4 dialysis centers, 4 medical groups and 3 group practices and clinics, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Robert Ra Nien Tseng's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tseng practices, 13 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Premier Surgery Center | Available with a free account |
| +13 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Robert Ra Nien Tseng is one of 1,401 nephrologists in California
Nephrology is Dr. Tseng's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Tseng is board certified in nephrology by the American Board of Internal Medicine. Dr. Tseng is licensed in California.
Specialties and state licenses
- Nephrology, CaliforniaPrimary
Clinical focus
Dmand AI lists acute kidney failure, chronic anemia, chronic kidney disease, fluid and electrolyte imbalances, kidney cysts and parathyroid gland disorder among the conditions Dr. Tseng treats.
Nephrologists near Dr. Tseng
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. Robert Ra Nien Tseng billed Medicare for 2,425 services in 2024
CMS data shows 2,425 Medicare services from Dr. Tseng across 26 procedure codes in 2024, for 514 Medicare patients. Medicare paid $249,283 for them.
Dr. Tseng's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,3522024: 1,67124%
- Other services
- 2023: 02024: 315
- Tests and treatments
- 2023: 4012024: 25337%
- Lab and pathology
- 2023: 02024: 142
- Surgery
- 2023: 02024: 44
Where Dr. Tseng's Medicare services took place, 2024
- In an office1,46961%
- In a facility95639%
Dr. Tseng compared with the California median for nephrologists, 2024
- Dr. Tseng
- California median
- Medicare services
- 2,425vs 1,0842.2 times
- Medicare patients
- 514vs 30767% above
- Part D claims
- 2,564vs 9552.7 times
Medians across 1,355 nephrologists in California with Dmand AI profiles that report each measure.
Dr. Tseng'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.
Need commercial claims for Dr. Tseng?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Tseng and other nephrologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert Ra Nien Tseng treated 514 Medicare patients in 2024, average age 76
CMS counts 514 Medicare patients who saw Dr. Tseng in 2024. The largest group is 75 to 84, with 202 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 39% are also on Medicaid. Their average risk score is 4.06, 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. Tseng's median patient age at 76, with 43% women.
Dr. Tseng's Medicare patients by age, 2024
Dr. Tseng's Medicare patients by sex, 2024
- Women23045%
- Men28455%
Chronic conditions among Dr. Tseng's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes64%
- Heart failure53%
- Ischemic heart disease46%
- Atrial fibrillation41%
- Arthritis39%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tseng's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women43%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Robert Ra Nien Tseng wrote 2,911 Medicare Part D claims in 2024
In 2024, Dr. Tseng wrote 2,911 Medicare Part D claims for 331 patients. 87% of them were for generic drugs. CMS names the drug for 2,564 of them, across 60 drugs with 11 or more claims each, at $493,504 in total drug cost. In 2023, CMS named 2,346 claims across 60 drugs.
Dr. Tseng's Part D claims by kind of drug, 2024
- Generic2,521 claims87%
- Brand-name and other390 claims13%
Dr. Tseng'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. Tseng's Part D claims, 2024
- Antibiotics1%30 of 2,911 claims
- Antipsychotics, patients 65 and over1%27 of 2,911 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: 2,3462024: 2,5649%
Drugs named by CMS: 60 in 2024, 60 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. Robert Ra Nien Tseng 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. Tseng for performance year 2024, reported individually. Dr. Tseng accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Tseng as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Tseng's MIPS scores, performance year 2024
- 100of 100Final score
- 100of 100Quality
- 98of 100Promoting Interoperability
- 40of 100Improvement Activities
- 85of 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. Robert Ra Nien Tseng received $20,653 in industry payments from 2016 to 2025
CMS Open Payments shows 410 general payments to Dr. Tseng from 30 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 38% of the total. Relypsa, Inc. paid the most, $14,074.
General payments to Dr. Tseng by program year, 2016 to 2025
General payments to Dr. Tseng by kind, 2016 to 2025
- Food and beverage$7,91138%
- Speaker and faculty fees$7,56037%
- Consulting fees$3,70018%
- Travel and lodging$1,1255%
- Education$3572%
Companies that paid Dr. Tseng the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert Ra Nien Tseng has 1 award and honors on record
Dmand AI lists 1 award for Dr. Tseng, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Tseng
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Robert Ra Nien Tseng graduated from Drexel University College Of Medicine
Dr. Tseng graduated from Drexel University College Of Medicine in 1997. Dr. Tseng is a member of ACP.
- Medical school
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. Robert Ra Nien Tseng accepts plans from 17 insurance carriers
Dr. Tseng is in network with 17 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- HCSC
- Kaiser Permanente
- Blue Cross Blue Shield of Massachusetts
- Humana
- +9 more carriersWith a free account
Plan types Dr. Tseng accepts, by number of carriers
- Medicare10
- PPO10
- HMO7
- POS6
- EPO5
Source: Dmand AI Insurance Network Data
Sources for Dr. Robert Ra Nien Tseng'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 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Robert Ra Nien Tseng
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. Robert Ra Nien Tseng's NPI number?
Dr. Robert Ra Nien Tseng's NPI number is 1053371559. It was assigned on March 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert Ra Nien Tseng?
Dr. Robert Ra Nien Tseng is a nephrologist in Concord, California. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Robert Ra Nien Tseng practice?
Dr. Tseng practices at 2222 East St, Concord, CA 94520. Dr. Tseng's primary practice is Premier Surgery Center in Concord, California. Dmand AI also links Dr. Tseng to 5 hospitals, 4 dialysis centers, 4 medical groups and 3 group practices and clinics.
What is Dr. Robert Ra Nien Tseng's office phone number?
The practice phone on file for Dr. Tseng is (925) 691-5000.
What is Dr. Robert Ra Nien Tseng's medical license number?
Dr. Tseng holds California license A66496.
Which hospitals is Dr. Robert Ra Nien Tseng affiliated with?
Dr. Tseng is affiliated with Mills-Peninsula Medical Center. Dmand AI links Dr. Tseng to 5 more hospitals.
What medical group is Dr. Robert Ra Nien Tseng part of?
Dr. Tseng is linked to West Coast Kidney Institute. Dmand AI links Dr. Tseng to 4 more medical groups.
Does Dr. Robert Ra Nien Tseng accept Medicare?
Yes. CMS data shows Dr. Tseng billed Medicare for 2,425 services in 2024, and Dr. Tseng accepts Medicare assignment.
Does Dr. Robert Ra Nien Tseng offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Tseng as offering telehealth services.
What is Dr. Robert Ra Nien Tseng's MIPS score?
Dr. Tseng's MIPS final score for performance year 2024 is 100 out of 100, reported individually.
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. Robert Ra Nien Tseng see?
CMS counts 514 Medicare patients who saw Dr. Tseng in 2024, with an average age of 76.
Is Dr. Robert Ra Nien Tseng board certified?
Yes. Dr. Tseng is board certified in nephrology by the American Board of Internal Medicine.
What services does Dr. Robert Ra Nien Tseng bill to Medicare?
In 2024, Dr. Tseng's most billed Medicare services were hospital inpatient care (99233), office visit, established patient (99215) and medicare service (G2211).
Where did Dr. Robert Ra Nien Tseng go to medical school?
Dr. Tseng graduated from Drexel University College Of Medicine in 1997.
What drugs does Dr. Robert Ra Nien Tseng prescribe most?
In 2024 Medicare Part D data, Dr. Tseng's most prescribed drugs by claims were Torsemide, Amlodipine Besylate and Losartan Potassium.
Has Dr. Robert Ra Nien Tseng received payments from drug or device companies?
CMS Open Payments shows $20,653 in general payments to Dr. Tseng from 30 companies from 2016 to 2025. The largest total came from Relypsa, Inc.
How long has Dr. Robert Ra Nien Tseng been practicing?
Dr. Tseng graduated from medical school in 1997, 29 years ago.
What insurance does Dr. Robert Ra Nien Tseng accept?
Dr. Tseng is in network with 17 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 10. Check the plan with the practice before a visit.
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