Dr. Arjun Roy, MD
- Medicare services, 2024
- 14
- Medicare patients, 2024
- 20
- Part D claims, 2024
- 14
- Hospital affiliations
- 1
- Industry payments
- $80
- Practice address
- 1425 S Main Street, Walnut Creek, CA 94596
- Practice phone
- Call (925) 295-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Roy's professional email, personal email and mobile number
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Dr. Arjun Roy is an internist in Walnut Creek, California
Dr. Roy practices at Walnut Creek Medical Center in Walnut Creek, California, part of Kaiser Permanente.
Dr. Roy's NPI, 1821067836, was assigned on March 14, 2006. Dr. Roy graduated from New York Medical College in 1995. Dr. Roy's Nevada license number on file is 11142.
- NPI
- 1821067836NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4082673223
- NPI enumeration date
- March 14, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (925) 295-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Arjun Roy practices at Walnut Creek Medical Center in Walnut Creek, California
Dr. Roy's primary practice is Walnut Creek Medical Center, at 1425 S Main Street, Walnut Creek, CA 94596 in Contra Costa County. The practice phone is (925) 295-4000.
- Walnut Creek Medical Center1425 S Main Street, Walnut Creek, CA 94596 · Contra Costa CountyPhone(925) 295-4000
Source: Dmand AI Affiliation Data
Dr. Arjun Roy is affiliated with 1 site of care and 1 medical group
Dr. Roy's primary practice is Walnut Creek Medical Center in Walnut Creek, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Arjun Roy's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Roy practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Walnut Creek Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Arjun Roy is one of 16,751 internists in California
Internal medicine is Dr. Roy's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Roy is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Roy's licenses on file in 2 states: Nevada and California.
Specialties and state licenses
- Internal medicine, NevadaPrimary
- California license
Internists near Dr. Roy
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. Arjun Roy billed Medicare for 14 services in 2024
CMS data shows 14 Medicare services from Dr. Roy across 1 procedure code in 2024, for 20 Medicare patients. Medicare paid $1,614 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Roy's Medicare services by type, 2017 to 2024
- 2017
- 2024
- Office and hospital visits
- 2017: 292024: 1452%
Dr. Roy compared with the California median for internists, 2024
- Dr. Roy
- California median
- Medicare services
- 14vs 36196% below
- Medicare patients
- 20vs 15187% below
- Part D claims
- 24vs 42194% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Roy'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. Roy and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Arjun Roy treated 20 Medicare patients in 2024, average age 72
CMS counts 20 Medicare patients who saw Dr. Roy in 2024. 75% of them have high blood pressure, and 65% have high cholesterol. Their average risk score is 3.68, 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. Roy's median patient age at 65, with 55% women.
Chronic conditions among Dr. Roy's Medicare patients, 2024
- High blood pressure75%
- High cholesterol65%
- Arthritis55%
- Chronic kidney disease55%
Share of Medicare patients with each condition. A patient can have several.
Dr. Roy's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Arjun Roy wrote 14 Medicare Part D claims in 2024
In 2024, Dr. Roy wrote 14 Medicare Part D claims for 13 patients. 79% of them were for generic drugs. They cover 2 drugs, with $447 in total drug cost. In 2019, CMS named 42 claims across 3 drugs.
Dr. Roy's Part D claims by kind of drug, 2024
- Generic11 claims79%
- Brand-name and other3 claims21%
Dr. Roy's most prescribed drugs by claims, 2020
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, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 422020: 2443%
Drugs named by CMS: 2 in 2020, 3 in 2019.
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
How Dr. Arjun Roy takes part in Medicare
Dr. Roy accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Arjun Roy received $80 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Roy from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. Biotronik Inc. paid the most, $80.
Companies that paid Dr. Roy the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Arjun Roy graduated from New York Medical College
Dr. Roy graduated from New York Medical College in 1995.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Arjun Roy accepts plans from 2 insurance carriers
Dr. Roy is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Roy accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Arjun Roy'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 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 | 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) |
| 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. Arjun Roy
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. Arjun Roy's NPI number?
Dr. Arjun Roy's NPI number is 1821067836. It was assigned on March 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Arjun Roy?
Dr. Arjun Roy is an internist in Walnut Creek, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Arjun Roy practice?
Dr. Roy practices at 1425 S Main Street, Walnut Creek, CA 94596. Dr. Roy's primary practice is Walnut Creek Medical Center in Walnut Creek, California, part of Kaiser Permanente.
What is Dr. Arjun Roy's office phone number?
The practice phone on file for Dr. Roy is (925) 295-4000.
What is Dr. Arjun Roy's medical license number?
Dr. Roy's Nevada license number on file is 11142, one of the licenses on file in 2 states.
Which states has Dr. Arjun Roy been licensed in?
Dmand AI has state licenses on file for Dr. Roy in Nevada (2004 to 2009) and California (2007 to 2026).
Which hospitals is Dr. Arjun Roy affiliated with?
Dr. Roy practices at Walnut Creek Medical Center in Walnut Creek, California.
What medical group is Dr. Arjun Roy part of?
Dr. Roy is linked to The Permanente Medical Group, Inc.
Does Dr. Arjun Roy accept Medicare?
Yes. CMS data shows Dr. Roy billed Medicare for 14 services in 2024, and Dr. Roy accepts Medicare assignment.
How many Medicare patients does Dr. Arjun Roy see?
CMS counts 20 Medicare patients who saw Dr. Roy in 2024, with an average age of 72.
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Is Dr. Arjun Roy board certified?
Yes. Dr. Roy is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Arjun Roy bill to Medicare?
In 2024, Dr. Roy's most billed Medicare services were hospital inpatient care (99222).
Where did Dr. Arjun Roy go to medical school?
Dr. Roy graduated from New York Medical College in 1995.
What drugs does Dr. Arjun Roy prescribe most?
In 2020 Medicare Part D data, Dr. Roy's most prescribed drugs by claims were Cefpodoxime Proxetil and Furosemide.
Has Dr. Arjun Roy received payments from drug or device companies?
CMS Open Payments shows $80 in general payments to Dr. Roy from 1 company from 2016 to 2016. The largest total came from Biotronik Inc.
How long has Dr. Arjun Roy been practicing?
Dr. Roy graduated from medical school in 1995, 31 years ago.
What insurance does Dr. Arjun Roy accept?
Dr. Roy is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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