Karen O'Brien, DO
NPI 1497234355 · Emergency Medicine Physician · Fishersville, VA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen O'Brien, DO is a Emergency Medicine Physician provider in Fishersville, VA (NPI 1497234355).
Provider details
- NPI number
- 1497234355
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
7 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,284 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 564 | $8 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 437 | $166 |
| Critical Care, First 30-74 Minutes99291 | 178 | $202 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 105 | $115 |
Typical Medicare-allowed amounts for these services range $8–$202 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 54 | 52 |
| Cephalexin | 36 | 36 |
| Oxycodone Hcl | 33 | 33 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 26 | 25 |
| Ondansetronbrand: Ondansetron Odt | 23 | 23 |
| Azithromycin | 19 | 19 |
| Doxycycline Monohydrate | 14 | 14 |
Practice location
Mailing address
Additional practice locations (1)
- 1 Cooper PlzCamden, NJ 08103-1461Phone: (856) 342-2352
Registry dates
- Enumerated
- 2018-08-11
- Last updated
- 2021-07-19
- Certified
- 2021-07-15
Frequently asked questions
- What is Karen O'Brien's NPI number?
- Karen O'Brien's National Provider Identifier (NPI) is 1497234355, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen O'Brien's specialty?
- Karen O'Brien is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen O'Brien located?
- Karen O'Brien's practice location on file with NPPES is 78 Medical Center Dr, Fishersville, VA 22939-2332.
- What is Karen O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Karen O'Brien is (540) 332-4423.
- Does Karen O'Brien accept Medicare?
- Karen 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 Karen O'Brien's NPI active?
- Yes — Karen O'Brien's NPI (1497234355) is active in the NPPES registry as of the last update on 2021-07-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.