Dr. Robert John O'Brian, MD
- Medicare services, 2024
- 20,817
- Medicare patients, 2024
- 416
- Part D claims, 2024
- 1,535
- Publications
- 2
- MIPS score, 2024
- 87
- Practice address
- 6190 Georgetown Blvd, Sykesville, MD 21784
- Practice phone
- Call (410) 795-9700
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Eldersburg Arthritis
Sykesville, Maryland
Find Dr. O'Brian'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 John O'Brian is a rheumatologist in Sykesville, Maryland
Dr. O'Brian practices at Eldersburg Arthritis in Sykesville, Maryland.
Dr. O'Brian's NPI, 1730140724, was assigned on March 29, 2006. Dr. O'Brian graduated from George Washington University School of Medicine in 1998. Dr. O'Brian holds North Carolina license 9901590.
- NPI
- 1730140724NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7719138049
- NPI enumeration date
- March 29, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (410) 795-9700
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Robert John O'Brian practices at Eldersburg Arthritis in Sykesville, Maryland
Dr. O'Brian's primary practice is Eldersburg Arthritis, at 6190 Georgetown Blvd, Sykesville, MD 21784 in Carroll County. The practice phone is (410) 795-9700.
- Eldersburg Arthritis6190 Georgetown Blvd, Sykesville, MD 21784 · Carroll CountyPhone(410) 795-9700
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Robert John O'Brian is affiliated with 3 sites of care and 1 medical group
Dr. O'Brian's primary practice is Eldersburg Arthritis in Sykesville, Maryland. Dr. O'Brian is also affiliated with Frederick Health Hospital. The medical group on file is Eldersburg Arthritis. Dmand AI also links Dr. O'Brian to 1 more group practice or clinic, 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 John O'Brian's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Brian practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Eldersburg Arthritis | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Robert John O'Brian is one of 177 rheumatologists in Maryland
Rheumatology is Dr. O'Brian's primary specialty in the NPI Registry, under taxonomy code 207RR0500X. Dr. O'Brian is licensed in North Carolina.
Specialties and state licenses
- Rheumatology, North CarolinaPrimary
Rheumatologists near Dr. O'Brian
Counts of rheumatologists 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 John O'Brian billed Medicare for 20,817 services in 2024
CMS data shows 20,817 Medicare services from Dr. O'Brian across 16 procedure codes in 2024, for 416 Medicare patients. Medicare paid $554,345 for them. Every service was in an office.
Dr. O'Brian's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 10,0532024: 19,18991%
- Office and hospital visits
- 2023: 6582024: 6651%
- Other services
- 2023: 02024: 524
- Tests and treatments
- 2023: 2112024: 34664%
- Surgery
- 2023: 782024: 9319%
Dr. O'Brian compared with the Maryland median for rheumatologists, 2024
- Dr. O'Brian
- Maryland median
- Medicare services
- 20,817vs 3,9155.3 times
- Medicare patients
- 416vs 30039% above
- Part D claims
- 1,379vs 78276% above
Medians across 168 rheumatologists in Maryland with Dmand AI profiles that report each measure.
Dr. O'Brian'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. O'Brian and other rheumatologists in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert John O'Brian treated 416 Medicare patients in 2024, average age 73
CMS counts 416 Medicare patients who saw Dr. O'Brian in 2024. The largest group is 65 to 74, with 206 patients. 75% of them have arthritis, and 75% have high blood pressure. 6% are also on Medicaid. Their average risk score is 1.02, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. O'Brian's median patient age at 65, with 74% women.
Dr. O'Brian's Medicare patients by age, 2024
Dr. O'Brian's Medicare patients by sex, 2024
- Women32478%
- Men9222%
Chronic conditions among Dr. O'Brian's Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
- Osteoporosis37%
- Diabetes28%
- Mood disorders25%
- Anxiety24%
- Ischemic heart disease24%
Share of Medicare patients with each condition. A patient can have several.
Dr. O'Brian'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
- Women74%
- Men25%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Robert John O'Brian wrote 1,535 Medicare Part D claims in 2024
In 2024, Dr. O'Brian wrote 1,535 Medicare Part D claims for 316 patients. 74% of them were for generic drugs. CMS names the drug for 1,379 of them, across 24 drugs with 11 or more claims each, at $1,303,205 in total drug cost. In 2023, CMS named 1,268 claims across 22 drugs.
Dr. O'Brian's Part D claims by kind of drug, 2024
- Generic1,135 claims74%
- Brand-name and other400 claims26%
Dr. O'Brian'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,2682024: 1,3799%
Drugs named by CMS: 24 in 2024, 22 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 John O'Brian scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. O'Brian for performance year 2024, reported as part of a group. Dr. O'Brian accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. O'Brian's MIPS scores, performance year 2024
- 87of 100Final score
- 74.8of 100Quality
- 40of 100Improvement Activities
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 John O'Brian has 2 publications on record
Dmand AI links 2 papers to Dr. O'Brian. Dr. O'Brian has published most often in J Clin Rheumatol. Dr. O'Brian's most frequent co-author is Vanya David Wagler, DO.
Dr. O'Brian's most frequent co-authors
Recent publications by Dr. O'Brian
J Clin Rheumatol
See who Dr. O'Brian researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. O'Brian works with, so you can find a warm path to the right rheumatologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Robert John O'Brian received $1,193 in industry payments from 2020 to 2025
CMS Open Payments shows 51 general payments to Dr. O'Brian from 12 drug and device companies from 2020 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $240.
General payments to Dr. O'Brian by program year, 2020 to 2025
Companies that paid Dr. O'Brian the most, 2020 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert John O'Brian graduated from George Washington University School of Medicine
Dr. O'Brian graduated from George Washington University School of Medicine in 1998.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Robert John O'Brian'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) |
| 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 |
| 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 John O'Brian
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 John O'Brian's NPI number?
Dr. Robert John O'Brian's NPI number is 1730140724. It was assigned on March 29, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert John O'Brian?
Dr. Robert John O'Brian is a rheumatologist in Sykesville, Maryland. The primary specialty in the NPI Registry is Rheumatology Physician (taxonomy code 207RR0500X).
Where does Dr. Robert John O'Brian practice?
Dr. O'Brian practices at 6190 Georgetown Blvd, Sykesville, MD 21784. Dr. O'Brian's primary practice is Eldersburg Arthritis in Sykesville, Maryland. Dmand AI also links Dr. O'Brian to 1 group practice or clinic.
What is Dr. Robert John O'Brian's office phone number?
The practice phone on file for Dr. O'Brian is (410) 795-9700.
What is Dr. Robert John O'Brian's medical license number?
Dr. O'Brian holds North Carolina license 9901590.
Which hospitals is Dr. Robert John O'Brian affiliated with?
Dr. O'Brian is affiliated with Frederick Health Hospital.
What medical group is Dr. Robert John O'Brian part of?
Dr. O'Brian is linked to Eldersburg Arthritis.
Does Dr. Robert John O'Brian accept Medicare?
Yes. CMS data shows Dr. O'Brian billed Medicare for 20,817 services in 2024, and Dr. O'Brian accepts Medicare assignment.
What is Dr. Robert John O'Brian's MIPS score?
Dr. O'Brian's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
How many Medicare patients does Dr. Robert John O'Brian see?
CMS counts 416 Medicare patients who saw Dr. O'Brian in 2024, with an average age of 73.
Show 7 more questionsShow fewer questions
What services does Dr. Robert John O'Brian bill to Medicare?
In 2024, Dr. O'Brian's most billed Medicare services were injected or infused drug (J0129), injected or infused drug (J0897) and injected or infused drug (J1602).
Where did Dr. Robert John O'Brian go to medical school?
Dr. O'Brian graduated from George Washington University School of Medicine in 1998.
What drugs does Dr. Robert John O'Brian prescribe most?
In 2024 Medicare Part D data, Dr. O'Brian's most prescribed drugs by claims were Methotrexate, Sulfasalazine and Prednisone.
Has Dr. Robert John O'Brian received payments from drug or device companies?
CMS Open Payments shows $1,193 in general payments to Dr. O'Brian from 12 companies from 2020 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Robert John O'Brian been practicing?
Dr. O'Brian graduated from medical school in 1998, 28 years ago.
Does Dr. Robert John O'Brian do research?
Dmand AI links 2 publications to Dr. O'Brian.
Who does Dr. Robert John O'Brian publish with?
Dr. O'Brian's most frequent co-authors are Vanya David Wagler, DO (1 shared paper).
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