Robert Nussbaum, M.D.
NPI 1659364511 · Gastroenterology Physician · Alexandria, VA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Nussbaum, M.D. is a Gastroenterology Physician provider in Alexandria, VA (NPI 1659364511).
Provider details
- NPI number
- 1659364511
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 0101047887 (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
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
985 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 274 | $97 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 262 | $124 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 223 | $266 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 104 | $110 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 73 | $47 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 158 | 156 |
| Omeprazole | 144 | 54 |
| Famotidine | 69 | 25 |
| Pantoprazole Sodium | 53 | 21 |
| Esomeprazole Magnesium | 37 | 11 |
| Linaclotidebrand: Linzess | 29 | — |
| Sod Sulf/Pot Chloride/Mag Sulfbrand: Sutab | 29 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-25
- Last updated
- 2014-03-02
Frequently asked questions
- What is Robert Nussbaum's NPI number?
- Robert Nussbaum's National Provider Identifier (NPI) is 1659364511, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Nussbaum's specialty?
- Robert Nussbaum is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Nussbaum located?
- Robert Nussbaum's practice location on file with NPPES is 6355 Walker Ln, Alexandria, VA 22310-3245.
- What is Robert Nussbaum's phone number?
- The practice phone number listed in the NPPES registry for Robert Nussbaum is (703) 313-8400.
- Does Robert Nussbaum accept Medicare?
- Robert Nussbaum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Nussbaum's NPI active?
- Yes — Robert Nussbaum's NPI (1659364511) is active in the NPPES registry as of the last update on 2014-03-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.