Elizabeth O'Brien, MD
NPI 1649205717 · Emergency Medical Services (Emergency Medicine) Physician · Dover, NH
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Elizabeth O'Brien, MD is a Emergency Medical Services (Emergency Medicine) Physician provider in Dover, NH (NPI 1649205717).
Provider details
- NPI number
- 1649205717
- Entity type
- Individual
- Primary specialty
- Emergency Medical Services (Emergency Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 13121 (NH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
517 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 347 | $169 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 99 | $95 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 36 | $117 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 18 | $131 |
| Critical Care, First 30-74 Minutes99291 | 17 | $207 |
Typical Medicare-allowed amounts for these services range $95–$207 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cephalexin | 37 | 37 |
| Prednisone | 34 | 32 |
| Doxycycline Monohydrate | 33 | 33 |
| Methylprednisolone | 25 | 25 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 18 | 18 |
| Ondansetronbrand: Ondansetron Odt | 15 | 15 |
| Cyclobenzaprine Hcl | 12 | 11 |
These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-11
- Last updated
- 2008-09-30
Frequently asked questions
- What is Elizabeth O'Brien's NPI number?
- Elizabeth O'Brien's National Provider Identifier (NPI) is 1649205717, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Elizabeth O'Brien's specialty?
- Elizabeth O'Brien is listed in the NPPES registry with a primary specialty of Emergency Medical Services (Emergency Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Elizabeth O'Brien located?
- Elizabeth O'Brien's practice location on file with NPPES is 789 Central Ave, Dover, NH 03820-2526.
- What is Elizabeth O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Elizabeth O'Brien is (603) 740-2163.
- Does Elizabeth O'Brien accept Medicare?
- Elizabeth O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Elizabeth O'Brien's NPI active?
- Yes — Elizabeth O'Brien's NPI (1649205717) is active in the NPPES registry as of the last update on 2008-09-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.