Dr. Matthew Christopher O'Brien, DO
- Part D claims, 2024
- 25
- Hospital affiliations
- 1
- Industry payments
- $1,525
- Medical groups
- 2
- State license
- 1
- Practice address
- 3400 East Racine Street, Janesville, WI 53546
- Practice phone
- Call (608) 373-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
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Dr. Matthew Christopher O'Brien is a general surgeon in Janesville, Wisconsin
Dr. O'Brien practices at SSM Health St. Mary's Hospital - Janesville in Janesville, Wisconsin, part of SSM Health Care.
Dr. O'Brien's NPI, 1417577024, was assigned on April 23, 2020. Dr. O'Brien graduated from Midwestern University, Chicago College of Osteopathic Med in 2020. Dr. O'Brien holds Wisconsin license 81821.
- NPI
- 1417577024NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8628499662
- NPI enumeration date
- April 23, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (608) 373-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Matthew Christopher O'Brien practices at SSM Health St. Mary's Hospital - Janesville in Janesville, Wisconsin
Dr. O'Brien's primary practice is SSM Health St. Mary's Hospital - Janesville, at 3400 East Racine Street, Janesville, WI 53546 in Rock County. The practice phone is (608) 373-8000.
- SSM Health St. Mary's Hospital - Janesville3400 East Racine Street, Janesville, WI 53546 · Rock CountyPhone(608) 373-8000
Source: Dmand AI Affiliation Data
Dr. Matthew Christopher O'Brien is affiliated with 3 sites of care and 2 medical groups
Dr. O'Brien's primary practice is SSM Health St. Mary's Hospital - Janesville in Janesville, Wisconsin, part of SSM Health Care. The medical group on file is SSM Health Dean Medical Group. Dmand AI also links Dr. O'Brien to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Matthew Christopher O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Brien practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| SSM Health St. Mary's Hospital - Janesville | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Matthew Christopher O'Brien is one of 565 general surgeons in Wisconsin
Surgery is Dr. O'Brien's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. O'Brien is licensed in Wisconsin.
Specialties and state licenses
- Surgery, WisconsinPrimary
General surgeons near Dr. O'Brien
Counts of general surgeons 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. Matthew Christopher O'Brien's patients have a median age of 56
Across all payers, Dmand AI patient panel data puts Dr. O'Brien's median patient age at 56, with 55% women.
Dr. O'Brien's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 56
Patient panel by sex, all payers
- Women55%
- Men44%
Source: Dmand AI Patient Panel Data
Dr. Matthew Christopher O'Brien wrote 25 Medicare Part D claims in 2024
In 2024, Dr. O'Brien wrote 25 Medicare Part D claims for 19 patients. 92% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $32 in total drug cost.
Dr. O'Brien's Part D claims by kind of drug, 2024
- Generic23 claims92%
- Brand-name and other2 claims8%
Dr. O'Brien'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. O'Brien's Part D claims, 2024
- Opioids48%12 of 25 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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. Matthew Christopher O'Brien ranks in the 50th percentile for colonoscopy in Medicare
Dr. O'Brien accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 23 procedures of colonoscopy by Dr. O'Brien, more than 50% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. O'Brien ranks in Medicare procedure volume
- Colonoscopy
- 50th percentile23 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Hernia repair (minimally invasive): 1 to 10 procedures (CMS shows small counts as a range)
Hernia repair - groin (open): 1 to 10 procedures (CMS shows small counts as a range)
Mastectomy: 1 to 10 procedures (CMS shows small counts as a range)
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Matthew Christopher O'Brien received $1,525 in industry payments from 2024 to 2025
CMS Open Payments shows 2 general payments to Dr. O'Brien from 2 drug and device companies from 2024 to 2025. Education make up the largest share, 98% of the total. Intuitive Surgical, Inc. paid the most, $1,500.
General payments to Dr. O'Brien by program year, 2024 to 2025
General payments to Dr. O'Brien by kind, 2024 to 2025
- Education$1,50098%
- Food and beverage$252%
Companies that paid Dr. O'Brien the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Matthew Christopher O'Brien graduated from Midwestern University, Chicago College of Osteopathic Med
Dr. O'Brien graduated from Midwestern University, Chicago College of Osteopathic Med in 2020.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Matthew Christopher O'Brien'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 patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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)Doctors and Clinicians Utilization Data (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 |
| 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. Matthew Christopher O'Brien
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What is Dr. Matthew Christopher O'Brien's NPI number?
Dr. Matthew Christopher O'Brien's NPI number is 1417577024. It was assigned on April 23, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Matthew Christopher O'Brien?
Dr. Matthew Christopher O'Brien is a general surgeon in Janesville, Wisconsin. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Matthew Christopher O'Brien practice?
Dr. O'Brien practices at 3400 East Racine Street, Janesville, WI 53546. Dr. O'Brien's primary practice is SSM Health St. Mary's Hospital - Janesville in Janesville, Wisconsin, part of SSM Health Care. Dmand AI also links Dr. O'Brien to 2 group practices and clinics and 1 medical group.
What is Dr. Matthew Christopher O'Brien's office phone number?
The practice phone on file for Dr. O'Brien is (608) 373-8000.
What is Dr. Matthew Christopher O'Brien's medical license number?
Dr. O'Brien holds Wisconsin license 81821.
Which hospitals is Dr. Matthew Christopher O'Brien affiliated with?
Dr. O'Brien practices at SSM Health St. Mary's Hospital - Janesville in Janesville, Wisconsin.
What medical group is Dr. Matthew Christopher O'Brien part of?
Dr. O'Brien is linked to SSM Health Dean Medical Group. Dmand AI links Dr. O'Brien to 1 more medical group.
Does Dr. Matthew Christopher O'Brien accept Medicare?
Yes. CMS lists Dr. O'Brien as accepting Medicare assignment.
Where did Dr. Matthew Christopher O'Brien go to medical school?
Dr. O'Brien graduated from Midwestern University, Chicago College of Osteopathic Med in 2020.
What drugs does Dr. Matthew Christopher O'Brien prescribe most?
In 2024 Medicare Part D data, Dr. O'Brien's most prescribed drugs by claims were Oxycodone HCl.
Has Dr. Matthew Christopher O'Brien received payments from drug or device companies?
CMS Open Payments shows $1,525 in general payments to Dr. O'Brien from 2 companies from 2024 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Matthew Christopher O'Brien been practicing?
Dr. O'Brien graduated from medical school in 2020, 6 years ago.
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