Diana L. O'Neil
- Medicare patients, 2024
- 389
- Part D claims, 2024
- 1,295
- Hospital affiliations
- 5
- Industry payments
- $18
- Medical groups
- 3
- Practice address
- 100 McGregor Street, Manchester, NH 03102
- Practice phone
- Call (603) 668-3545
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Diana O'Neil'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.
Diana L. O'Neil is a physician assistant in Manchester, New Hampshire
Diana O'Neil practices at Catholic Medical Center in Manchester, New Hampshire, part of HCA Healthcare.
Diana O'Neil's NPI, 1851718639, was assigned on March 18, 2014. Diana O'Neil holds New Hampshire license 1244.
- NPI
- 1851718639NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3274757356
- NPI enumeration date
- March 18, 2014
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (603) 668-3545
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Diana L. O'Neil practices at Catholic Medical Center in Manchester, New Hampshire
Diana O'Neil's primary practice is Catholic Medical Center, at 100 McGregor Street, Manchester, NH 03102 in Hillsborough County. The practice phone is (603) 668-3545.
- Catholic Medical Center100 McGregor Street, Manchester, NH 03102 · Hillsborough CountyPhone(603) 668-3545
Source: Dmand AI Affiliation Data
Diana L. O'Neil is affiliated with 7 sites of care and 3 medical groups
Diana O'Neil's primary practice is Catholic Medical Center in Manchester, New Hampshire, part of HCA Healthcare. Diana O'Neil is also affiliated with Dartmouth Hitchcock Medical Center. The medical group on file is Surgical Care Group. Dmand AI also links Diana O'Neil to 3 more hospitals, 2 group practices and clinics and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Diana L. O'Neil's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Diana O'Neil practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Catholic Medical Center | Available with a free account |
| +6 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Diana L. O'Neil is one of 796 physician assistants in New Hampshire
Physician assistant is Diana O'Neil's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Dmand AI has Diana O'Neil's licenses on file in 2 states: New Hampshire and Massachusetts.
Specialties and state licenses
- Physician assistant, New HampshirePrimary
- Massachusetts license
Physician assistants near Diana O'Neil
Counts of physician assistants 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
Diana L. O'Neil treated 389 Medicare patients in 2024, average age 77
CMS counts 389 Medicare patients who saw Diana O'Neil in 2024. The largest group is 75 to 84, with 186 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 9% are also on Medicaid. Their average risk score is 1.78, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Diana O'Neil's median patient age at 72, with 44% women.
Diana O'Neil's Medicare patients by age, 2024
Diana O'Neil's Medicare patients by sex, 2024
- Women16542%
- Men22458%
Chronic conditions among Diana O'Neil's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease68%
- Heart failure61%
- Atrial fibrillation55%
- Arthritis47%
- Chronic kidney disease45%
- Diabetes34%
Share of Medicare patients with each condition. A patient can have several.
Diana O'Neil's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women44%
- Men56%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Diana L. O'Neil wrote 1,295 Medicare Part D claims in 2024
In 2024, Diana O'Neil wrote 1,295 Medicare Part D claims for 257 patients. 82% of them were for generic drugs.
Diana O'Neil's Part D claims by kind of drug, 2024
- Generic1,065 claims82%
- Brand-name230 claims18%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Diana L. O'Neil takes part in Medicare
Diana O'Neil 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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Diana L. O'Neil received $18 in industry payments in 2025
CMS Open Payments shows 1 general payment to Diana O'Neil from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Impulse Dynamics (USA) Inc. paid the most, $18.
Companies that paid Diana O'Neil 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 Diana L. O'Neil'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 Diana L. O'Neil
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Diana L. O'Neil's NPI number?
Diana L. O'Neil's NPI number is 1851718639. It was assigned on March 18, 2014, and it is active in the NPI Registry.
What does Diana L. O'Neil specialize in?
Diana L. O'Neil is a physician assistant in Manchester, New Hampshire. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Diana L. O'Neil practice?
Diana O'Neil practices at 100 McGregor Street, Manchester, NH 03102. Diana O'Neil's primary practice is Catholic Medical Center in Manchester, New Hampshire, part of HCA Healthcare. Dmand AI also links Diana O'Neil to 3 hospitals, 2 group practices and clinics and 2 medical groups.
What is Diana L. O'Neil's office phone number?
The practice phone on file for Diana O'Neil is (603) 668-3545.
What is Diana L. O'Neil's medical license number?
Diana O'Neil holds New Hampshire license 1244, one of the licenses on file in 2 states.
Which states has Diana L. O'Neil been licensed in?
Dmand AI has state licenses on file for Diana O'Neil in New Hampshire and Massachusetts.
Which hospitals is Diana L. O'Neil affiliated with?
Diana O'Neil practices at Catholic Medical Center in Manchester, New Hampshire. Diana O'Neil is also affiliated with Dartmouth Hitchcock Medical Center. Dmand AI links Diana O'Neil to 3 more hospitals.
What medical group is Diana L. O'Neil part of?
Diana O'Neil is linked to Surgical Care Group. Dmand AI links Diana O'Neil to 2 more medical groups.
Does Diana L. O'Neil accept Medicare?
Yes. CMS lists Diana O'Neil as accepting Medicare assignment.
How many Medicare patients does Diana L. O'Neil see?
CMS counts 389 Medicare patients who saw Diana O'Neil in 2024, with an average age of 77.
Has Diana L. O'Neil received payments from drug or device companies?
CMS Open Payments shows $18 in general payments to Diana O'Neil from 1 company from 2025 to 2025. The largest total came from Impulse Dynamics (USA) Inc.
How long has Diana L. O'Neil been practicing?
Diana O'Neil graduated from medical school in 2013, 13 years ago.
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