Dr. Mark D. O'Brien, DO
- Hospital affiliations
- 1
- Industry payments
- $153
- Medical group
- 1
- State license
- 1
- Year NPI issued
- 2006
- Practice address
- 11109 Parkview Plaza Drive, Fort Wayne, IN 46845
- Practice phone
- Call (260) 266-1195
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. O'Brien'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. Mark D. O'Brien is a pediatrician in Fort Wayne, Indiana
Dr. O'Brien practices at Parkview Regional Medical Center in Fort Wayne, Indiana, part of Parkview Health System.
Dr. O'Brien's NPI, 1265532212, was assigned on September 22, 2006. Dr. O'Brien graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 1990. Dr. O'Brien holds Indiana license 02001451A.
- NPI
- 1265532212NPI Registry (opens in a new tab)
- NPI enumeration date
- September 22, 2006
- NPI status
- Active
- Practice phone
- (260) 266-1195
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Mark D. O'Brien practices at Parkview Regional Medical Center in Fort Wayne, Indiana
Dr. O'Brien's primary practice is Parkview Regional Medical Center, at 11109 Parkview Plaza Drive, Fort Wayne, IN 46845 in Allen County. The practice phone is (260) 266-1195.
- Parkview Regional Medical Center11109 Parkview Plaza Drive, Fort Wayne, IN 46845 · Allen CountyPhone(260) 266-1195
Source: Dmand AI Affiliation Data
Dr. Mark D. O'Brien is affiliated with 2 sites of care and 1 medical group
Dr. O'Brien's primary practice is Parkview Regional Medical Center in Fort Wayne, Indiana, part of Parkview Health System. The medical group on file is Parkview Physicians Group. Dmand AI also links Dr. O'Brien to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark D. O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Brien practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Parkview Regional Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Parkview Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mark D. O'Brien is one of 949 pediatricians in Indiana
Pediatrics is Dr. O'Brien's primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. O'Brien is licensed in Indiana.
Specialties and state licenses
- Pediatrics, IndianaPrimary
Pediatricians near Dr. O'Brien
Counts of pediatricians 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. Mark D. O'Brien's patients have a median age of 11
Across all payers, Dmand AI patient panel data puts Dr. O'Brien's median patient age at 11, with 45% 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 11
Patient panel by sex, all payers
- Women45%
- Men54%
Source: Dmand AI Patient Panel Data
Dr. Mark D. O'Brien received $153 in industry payments from 2016 to 2025
CMS Open Payments shows 10 general payments to Dr. O'Brien from 7 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Rhodes Pharmaceuticals L.P. paid the most, $33.
General payments to Dr. O'Brien by program year, 2016 to 2025
Companies that paid Dr. O'Brien 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. Mark D. O'Brien graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville
Dr. O'Brien graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 1990.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark D. 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 |
| 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. Mark D. O'Brien
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. Mark D. O'Brien's NPI number?
Dr. Mark D. O'Brien's NPI number is 1265532212. It was assigned on September 22, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark D. O'Brien?
Dr. Mark D. O'Brien is a pediatrician in Fort Wayne, Indiana. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. Mark D. O'Brien practice?
Dr. O'Brien practices at 11109 Parkview Plaza Drive, Fort Wayne, IN 46845. Dr. O'Brien's primary practice is Parkview Regional Medical Center in Fort Wayne, Indiana, part of Parkview Health System. Dmand AI also links Dr. O'Brien to 1 group practice or clinic.
What is Dr. Mark D. O'Brien's office phone number?
The practice phone on file for Dr. O'Brien is (260) 266-1195.
What is Dr. Mark D. O'Brien's medical license number?
Dr. O'Brien holds Indiana license 02001451A.
Which hospitals is Dr. Mark D. O'Brien affiliated with?
Dr. O'Brien practices at Parkview Regional Medical Center in Fort Wayne, Indiana.
What medical group is Dr. Mark D. O'Brien part of?
Dr. O'Brien is linked to Parkview Physicians Group.
Where did Dr. Mark D. O'Brien go to medical school?
Dr. O'Brien graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 1990.
Has Dr. Mark D. O'Brien received payments from drug or device companies?
CMS Open Payments shows $153 in general payments to Dr. O'Brien from 7 companies from 2016 to 2025. The largest total came from Rhodes Pharmaceuticals L.P.
How long has Dr. Mark D. O'Brien been practicing?
Dr. O'Brien graduated from medical school in 1990, 36 years ago.
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