Gretchen O'Brien, NP
- Medicare patients, 2024
- 330
- Part D claims, 2024
- 133
- Hospital affiliations
- 2
- Industry payments
- $22
- Medical groups
- 2
- Practice address
- 330 Brookline Avenue, Boston, MA 02215
- Practice phone
- Call (617) 667-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Gretchen 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.
Gretchen O'Brien is a nurse practitioner in Boston, Massachusetts
Gretchen O'Brien practices at Beth Israel Deaconess Medical Center in Boston, Massachusetts, part of Beth Israel Lahey Health.
Gretchen O'Brien's NPI, 1013220961, was assigned on July 21, 2010. Gretchen O'Brien holds Massachusetts license RN232134.
- NPI
- 1013220961NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0345284402
- NPI enumeration date
- July 21, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (617) 667-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Gretchen O'Brien practices at Beth Israel Deaconess Medical Center in Boston, Massachusetts
Gretchen O'Brien's primary practice is Beth Israel Deaconess Medical Center, at 330 Brookline Avenue, Boston, MA 02215 in Suffolk County. The practice phone is (617) 667-7000.
- Beth Israel Deaconess Medical Center330 Brookline Avenue, Boston, MA 02215 · Suffolk CountyPhone(617) 667-7000
Source: Dmand AI Affiliation Data
Gretchen O'Brien is affiliated with 4 sites of care and 2 medical groups
Gretchen O'Brien's primary practice is Beth Israel Deaconess Medical Center in Boston, Massachusetts, part of Beth Israel Lahey Health. Gretchen O'Brien is also affiliated with Beth Israel Deaconess Hospital-Needham. The medical group on file is Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP). Dmand AI also links Gretchen 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 Gretchen O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Gretchen O'Brien practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Beth Israel Deaconess Medical Center | Available with a free account |
| +3 more sites and 1 medical group | 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 Beth Israel Lahey Health and 6.2K+ hospitals, with verified contacts in the same login.
Gretchen O'Brien is one of 2,511 nurse practitioners in Massachusetts
Nurse practitioner is Gretchen O'Brien's primary specialty in the NPI Registry, under taxonomy code 363L00000X. Gretchen O'Brien is licensed in Massachusetts.
Specialties and state licenses
- Nurse practitioner, MassachusettsPrimary
Nurse practitioners near Gretchen O'Brien
Counts of nurse practitioners 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
Gretchen O'Brien treated 330 Medicare patients in 2024, average age 79
CMS counts 330 Medicare patients who saw Gretchen O'Brien in 2024. The largest group is 75 to 84, with 126 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 14% are also on Medicaid. Their average risk score is 1.76, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Gretchen O'Brien's median patient age at 77, with 36% women.
Gretchen O'Brien's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Gretchen O'Brien's Medicare patients by sex, 2024
- Women14444%
- Men18656%
Chronic conditions among Gretchen O'Brien's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Heart failure59%
- Atrial fibrillation58%
- Ischemic heart disease50%
- Arthritis46%
- Chronic kidney disease38%
- Diabetes34%
Share of Medicare patients with each condition. A patient can have several.
Gretchen 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 77
Patient panel by sex, all payers
- Women36%
- Men63%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Gretchen O'Brien wrote 133 Medicare Part D claims in 2024
In 2024, Gretchen O'Brien wrote 133 Medicare Part D claims for 68 patients. 80% of them were for generic drugs.
Gretchen O'Brien's Part D claims by kind of drug, 2024
- Generic107 claims80%
- Brand-name26 claims20%
Drug classes CMS tracks in Gretchen O'Brien's Part D claims, 2024
- Antibiotics8%11 of 133 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Gretchen O'Brien offers telehealth to Medicare patients
Gretchen O'Brien accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Gretchen O'Brien as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
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Gretchen O'Brien received $22 in industry payments in 2025
CMS Open Payments shows 1 general payment to Gretchen O'Brien from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $22.
Companies that paid Gretchen 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 Gretchen 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) |
| Part D prescribing | 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 Gretchen 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 Gretchen O'Brien's NPI number?
Gretchen O'Brien's NPI number is 1013220961. It was assigned on July 21, 2010, and it is active in the NPI Registry.
What does Gretchen O'Brien specialize in?
Gretchen O'Brien is a nurse practitioner in Boston, Massachusetts. The primary specialty in the NPI Registry is Nurse Practitioner (taxonomy code 363L00000X).
Where does Gretchen O'Brien practice?
Gretchen O'Brien practices at 330 Brookline Avenue, Boston, MA 02215. Gretchen O'Brien's primary practice is Beth Israel Deaconess Medical Center in Boston, Massachusetts, part of Beth Israel Lahey Health. Dmand AI also links Gretchen O'Brien to 2 group practices and clinics and 1 medical group.
What is Gretchen O'Brien's office phone number?
The practice phone on file for Gretchen O'Brien is (617) 667-7000.
What is Gretchen O'Brien's medical license number?
Gretchen O'Brien holds Massachusetts license RN232134.
Which hospitals is Gretchen O'Brien affiliated with?
Gretchen O'Brien practices at Beth Israel Deaconess Medical Center in Boston, Massachusetts. Gretchen O'Brien is also affiliated with Beth Israel Deaconess Hospital-Needham.
What medical group is Gretchen O'Brien part of?
Gretchen O'Brien is linked to Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP). Dmand AI links Gretchen O'Brien to 1 more medical group.
Does Gretchen O'Brien accept Medicare?
Yes. CMS lists Gretchen O'Brien as accepting Medicare assignment.
Does Gretchen O'Brien offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Gretchen O'Brien as offering telehealth services.
How many Medicare patients does Gretchen O'Brien see?
CMS counts 330 Medicare patients who saw Gretchen O'Brien in 2024, with an average age of 79.
Has Gretchen O'Brien received payments from drug or device companies?
CMS Open Payments shows $22 in general payments to Gretchen O'Brien from 1 company from 2025 to 2025. The largest total came from Boston Scientific Corporation.
How long has Gretchen O'Brien been practicing?
Gretchen O'Brien graduated from medical school in 2003, 23 years ago.
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