Daniel Patrick O'Brien, PA-C
- Medicare services, 2024
- 27
- Medicare patients, 2024
- 63
- Part D claims, 2024
- 122
- Hospital affiliations
- 1
- Industry payments
- $47
- Practice address
- 14 Prospect Street, Milford, MA 01757
- Practice phone
- Call (508) 473-1190
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Daniel 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.
Daniel Patrick O'Brien is an emergency medicine physician in Milford, Massachusetts
Daniel O'Brien practices at UMass Memorial Health - Milford Regional Medical Center in Milford, Massachusetts, part of UMass Memorial Health Care.
Daniel O'Brien's NPI, 1689284366, was assigned on August 6, 2020. Daniel O'Brien holds Massachusetts license PA8087.
- NPI
- 1689284366NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8022414770
- NPI enumeration date
- August 6, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (508) 473-1190
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 31
- Medical school graduation
- 2021
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Daniel Patrick O'Brien practices at UMass Memorial Health - Milford Regional Medical Center in Milford, Massachusetts
Daniel O'Brien's primary practice is UMass Memorial Health - Milford Regional Medical Center, at 14 Prospect Street, Milford, MA 01757 in Worcester County. The practice phone is (508) 473-1190.
- UMass Memorial Health - Milford Regional Medical Center14 Prospect Street, Milford, MA 01757 · Worcester CountyPhone(508) 473-1190
Source: Dmand AI Affiliation Data
Daniel Patrick O'Brien is affiliated with 2 sites of care and 3 medical groups
Daniel O'Brien's primary practice is UMass Memorial Health - Milford Regional Medical Center in Milford, Massachusetts, part of UMass Memorial Health Care. The medical group on file is UMass Memorial Medical Group. Dmand AI also links Daniel O'Brien to 2 more medical groups and 1 imaging center, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Daniel Patrick O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Daniel O'Brien practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UMass Memorial Health - Milford Regional Medical Center | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Daniel Patrick O'Brien is one of 1,483 emergency medicine physicians in Massachusetts
Emergency medicine is Daniel O'Brien's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Daniel O'Brien is licensed in Massachusetts.
Specialties and state licenses
- Emergency medicine, MassachusettsPrimary
Emergency medicine physicians near Daniel O'Brien
Counts of emergency medicine physicians 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
Daniel Patrick O'Brien billed Medicare for 27 services in 2024
CMS data shows 27 Medicare services from Daniel O'Brien across 1 procedure code in 2024, all of them office visits, for 63 Medicare patients. Medicare paid $1,712 for them. Every service was in an office.
Daniel O'Brien compared with the Massachusetts median for emergency medicine physicians, 2024
- Daniel O'Brien
- Massachusetts median
- Medicare services
- 27vs 34192% below
- Medicare patients
- 63vs 33781% below
- Part D claims
- 60vs 3667% above
Medians across 1,477 emergency medicine physicians in Massachusetts with Dmand AI profiles that report each measure.
Daniel O'Brien'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Daniel Patrick O'Brien treated 63 Medicare patients in 2024, average age 73
CMS counts 63 Medicare patients who saw Daniel O'Brien in 2024. The largest group is 75 to 84, with 24 patients. 75% of them have high cholesterol, and 71% have high blood pressure. 27% are also on Medicaid. Their average risk score is 1.34, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Daniel O'Brien's median patient age at 48, with 62% women.
Daniel O'Brien's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Daniel O'Brien's Medicare patients by sex, 2024
- Women4267%
- Men2133%
Chronic conditions among Daniel O'Brien's Medicare patients, 2024
- High cholesterol75%
- High blood pressure71%
- Arthritis52%
- Anxiety38%
- Mood disorders37%
- Depression33%
- Diabetes29%
- Cancer24%
Share of Medicare patients with each condition. A patient can have several.
Daniel 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 48
Patient panel by sex, all payers
- Women62%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Daniel Patrick O'Brien wrote 122 Medicare Part D claims in 2024
In 2024, Daniel O'Brien wrote 122 Medicare Part D claims for 99 patients. 93% of them were for generic drugs. CMS names the drug for 60 of them, across 4 drugs with 11 or more claims each, at $1,257 in total drug cost. In 2023, CMS named 25 claims across 2 drugs.
Daniel O'Brien's Part D claims by kind of drug, 2024
- Generic114 claims93%
- Brand-name and other8 claims7%
Daniel 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 Daniel O'Brien's Part D claims, 2024
- Antibiotics43%53 of 122 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 252024: 60140%
Drugs named by CMS: 4 in 2024, 2 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
How Daniel Patrick O'Brien takes part in Medicare
Daniel 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)
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Daniel Patrick O'Brien received $47 in industry payments in 2024
CMS Open Payments shows 1 general payment to Daniel O'Brien from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. Dentsply Ih AB paid the most, $47.
Companies that paid Daniel O'Brien the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Daniel Patrick 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 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) |
| 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 Daniel Patrick 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 Daniel Patrick O'Brien's NPI number?
Daniel Patrick O'Brien's NPI number is 1689284366. It was assigned on August 6, 2020, and it is active in the NPI Registry.
What does Daniel Patrick O'Brien specialize in?
Daniel Patrick O'Brien is an emergency medicine physician in Milford, Massachusetts. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Daniel Patrick O'Brien practice?
Daniel O'Brien practices at 14 Prospect Street, Milford, MA 01757. Daniel O'Brien's primary practice is UMass Memorial Health - Milford Regional Medical Center in Milford, Massachusetts, part of UMass Memorial Health Care. Dmand AI also links Daniel O'Brien to 2 medical groups and 1 imaging center.
What is Daniel Patrick O'Brien's office phone number?
The practice phone on file for Daniel O'Brien is (508) 473-1190.
What is Daniel Patrick O'Brien's medical license number?
Daniel O'Brien holds Massachusetts license PA8087.
Which hospitals is Daniel Patrick O'Brien affiliated with?
Daniel O'Brien practices at UMass Memorial Health - Milford Regional Medical Center in Milford, Massachusetts.
What medical group is Daniel Patrick O'Brien part of?
Daniel O'Brien is linked to UMass Memorial Medical Group. Dmand AI links Daniel O'Brien to 2 more medical groups.
Does Daniel Patrick O'Brien accept Medicare?
Yes. CMS data shows Daniel O'Brien billed Medicare for 27 services in 2024, and Daniel O'Brien accepts Medicare assignment.
How many Medicare patients does Daniel Patrick O'Brien see?
CMS counts 63 Medicare patients who saw Daniel O'Brien in 2024, with an average age of 73.
What services does Daniel Patrick O'Brien bill to Medicare?
In 2024, Daniel O'Brien's most billed Medicare services were office visit, established patient (99213).
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What drugs does Daniel Patrick O'Brien prescribe most?
In 2024 Medicare Part D data, Daniel O'Brien's most prescribed drugs by claims were Cefpodoxime Proxetil, Doxycycline Monohydrate and Prednisone.
Has Daniel Patrick O'Brien received payments from drug or device companies?
CMS Open Payments shows $47 in general payments to Daniel O'Brien from 1 company from 2024 to 2024. The largest total came from Dentsply Ih AB.
How long has Daniel Patrick O'Brien been practicing?
Daniel O'Brien graduated from medical school in 2021, 5 years ago.
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