Michael D. O Brien, CRNA
- Medicare patients, 2024
- 159
- Hospital affiliations
- 3
- Industry payments
- $44
- Medical groups
- 6
- State license
- 1
- Practice address
- 56 Franklin Street, Waterbury, CT 06706
- Practice phone
- Call (203) 709-6020
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Michael O Brien's professional email, personal email and mobile number
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Michael D. O Brien is a nurse anesthetist in Waterbury, Connecticut
Michael O Brien practices at Saint Mary's Hospital in Waterbury, Connecticut, part of Trinity Health.
Michael O Brien's NPI, 1437168838, was assigned on August 5, 2006. Michael O Brien holds Connecticut license 72853.
- NPI
- 1437168838NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8224034830
- NPI enumeration date
- August 5, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (203) 709-6020
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Michael D. O Brien practices at Saint Mary's Hospital in Waterbury, Connecticut
Michael O Brien's primary practice is Saint Mary's Hospital, at 56 Franklin Street, Waterbury, CT 06706 in New Haven County. The practice phone is (203) 709-6020.
- Saint Mary's Hospital56 Franklin Street, Waterbury, CT 06706 · New Haven CountyPhone(203) 709-6020
Source: Dmand AI Affiliation Data
Michael D. O Brien is affiliated with 4 sites of care and 6 medical groups
Michael O Brien's primary practice is Saint Mary's Hospital in Waterbury, Connecticut, part of Trinity Health. Michael O Brien is also affiliated with UConn Health Waterbury Hospital. The medical group on file is Yale Health. Dmand AI also links Michael O Brien to 1 more hospital, 5 medical groups and 1 hospital outpatient department, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Michael D. O Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Michael O Brien practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Saint Mary's Hospital | Available with a free account |
| +3 more sites and 5 medical groups | 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 Trinity Health and 6.2K+ hospitals, with verified contacts in the same login.
Michael D. O Brien is one of 606 nurse anesthetists in Connecticut
Nurse anesthetist, certified registered is Michael O Brien's primary specialty in the NPI Registry, under taxonomy code 367500000X. Michael O Brien is licensed in Connecticut.
Specialties and state licenses
- Certified registered nurse anesthetist, ConnecticutPrimary
Nurse anesthetists near Michael O Brien
Counts of nurse anesthetists 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
Michael D. O Brien treated 159 Medicare patients in 2024, average age 74
CMS counts 159 Medicare patients who saw Michael O Brien in 2024. The largest group is 75 to 84, with 66 patients. 75% of them have high cholesterol, and 73% have high blood pressure. 28% are also on Medicaid. Their average risk score is 1.22, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Michael O Brien's median patient age at 69, with 57% women.
Michael O Brien's Medicare patients by age, 2024
Michael O Brien's Medicare patients by sex, 2024
- Women7849%
- Men8151%
Chronic conditions among Michael O Brien's Medicare patients, 2024
- High cholesterol75%
- High blood pressure73%
- Arthritis53%
- Diabetes34%
- Anxiety28%
- Ischemic heart disease28%
- Mood disorders26%
- Cancer23%
Share of Medicare patients with each condition. A patient can have several.
Michael 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 69
Patient panel by sex, all payers
- Women57%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Michael D. O Brien takes part in Medicare
Michael O Brien 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)
Michael D. O Brien received $44 in industry payments in 2025
CMS Open Payments shows 2 general payments to Michael O Brien from 2 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Takeda Pharmaceuticals U.S.A., Inc. paid the most, $27.
Companies that paid Michael O Brien the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Michael 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 DataMedicare Physician & Other Practitioners - 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) |
| 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 Michael D. O Brien
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What is Michael D. O Brien's NPI number?
Michael D. O Brien's NPI number is 1437168838. It was assigned on August 5, 2006, and it is active in the NPI Registry.
What does Michael D. O Brien specialize in?
Michael D. O Brien is a nurse anesthetist in Waterbury, Connecticut. The primary specialty in the NPI Registry is Certified Registered Nurse Anesthetist (taxonomy code 367500000X).
Where does Michael D. O Brien practice?
Michael O Brien practices at 56 Franklin Street, Waterbury, CT 06706. Michael O Brien's primary practice is Saint Mary's Hospital in Waterbury, Connecticut, part of Trinity Health. Dmand AI also links Michael O Brien to 1 hospital, 5 medical groups and 1 hospital outpatient department.
What is Michael D. O Brien's office phone number?
The practice phone on file for Michael O Brien is (203) 709-6020.
What is Michael D. O Brien's medical license number?
Michael O Brien holds Connecticut license 72853.
Which hospitals is Michael D. O Brien affiliated with?
Michael O Brien practices at Saint Mary's Hospital in Waterbury, Connecticut. Michael O Brien is also affiliated with UConn Health Waterbury Hospital. Dmand AI links Michael O Brien to 1 more hospital.
What medical group is Michael D. O Brien part of?
Michael O Brien is linked to Yale Health. Dmand AI links Michael O Brien to 5 more medical groups.
Does Michael D. O Brien accept Medicare?
Yes. CMS lists Michael O Brien as accepting Medicare assignment.
How many Medicare patients does Michael D. O Brien see?
CMS counts 159 Medicare patients who saw Michael O Brien in 2024, with an average age of 74.
Has Michael D. O Brien received payments from drug or device companies?
CMS Open Payments shows $44 in general payments to Michael O Brien from 2 companies from 2025 to 2025. The largest total came from Takeda Pharmaceuticals U.S.A., Inc.
How long has Michael D. O Brien been practicing?
Michael O Brien graduated from medical school in 2006, 20 years ago.
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