Quick answers
- Does Diana L. Oneil accept Medicare assignment?
- Yes. Medicare's clinician data says Diana L. Oneil accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Diana L. Oneil see?
- In 2024, CMS data shows 389 Original Medicare patients and 785 services for Diana L. Oneil. This counts Original Medicare only and measures volume, not quality.
- What is Diana L. Oneil's NPI number?
- 1851718639. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Diana L. Oneil, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 389 |
|---|---|
| Services billed to Medicare | 785 |
| Different services or procedures | 19 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Remote monitoring of pulmonary artery pressure sensor, up to 30 days (93264)215 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)142 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)105 services
- Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician (93016)94 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)72 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease68%
- Heart failure61%
- Atrial fibrillation55%
- Arthritis47%
Hospitals where Diana L. Oneil works
Medicare's Facility Affiliation Data lists Diana L. Oneil at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Concord HospitalConcord, NH · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 300001
- Concord Hospital- LaconiaLaconia, NH · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 300005
- Mary Hitchcock Memorial HospitalLebanon, NH · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 300003
Practice locations
Addresses where Diana L. Oneil is enrolled with Medicare (CMS data updated October 2, 2026).
- 250 Pleasant StConcord, NH 03301
Group practices
Medicare enrollment lists Diana L. Oneil as a member of this group (CMS data updated October 2, 2026).
- Concord Hospital Inc567 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Concord
Clinicians with the same Medicare primary specialty in Concord, NH — not a recommendation.
Other clinicians in Concord Hospital Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2013 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1851718639 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians