John O'Brien, M.D.
NPI 1952392482 · Cardiovascular Disease Physician · Falls Church, VA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John O'Brien, M.D. is a Cardiovascular Disease Physician provider in Falls Church, VA (NPI 1952392482).
Provider details
- NPI number
- 1952392482
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 0101036720 (VA)
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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
3,188 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 | 1,250 | $9 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 494 | $16 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 458 | $141 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 241 | $72 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 231 | $73 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 30 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 135 | 43 |
| Metoprolol Succinate | 133 | 44 |
| Losartan Potassium | 120 | 33 |
| Diltiazem Hclbrand: Diltiazem 24hr Er (cd) | 99 | 42 |
| Atorvastatin Calcium | 98 | 34 |
| Furosemide | 79 | 33 |
| Spironolactone |
Practice location
Mailing address
Additional practice locations (1)
- 3299 Woodburn RdSuite 200Annandale, VA 22003-1275Phone: (703) 573-0740Fax: (703) 207-8561
Registry dates
- Enumerated
- 2005-11-03
- Last updated
- 2022-01-05
- Certified
- 2022-01-05
Frequently asked questions
- What is John O'Brien's NPI number?
- John O'Brien's National Provider Identifier (NPI) is 1952392482, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John O'Brien's specialty?
- John O'Brien is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is John O'Brien located?
- John O'Brien's practice location on file with NPPES is 3300 Gallows Rd, Falls Church, VA 22042-3307.
- What is John O'Brien's phone number?
- The practice phone number listed in the NPPES registry for John O'Brien is (703) 776-4001.
- Does John O'Brien accept Medicare?
- John 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 John O'Brien's NPI active?
- Yes — John O'Brien's NPI (1952392482) is active in the NPPES registry as of the last update on 2022-01-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.