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DR. ROBERT ALAN NUSSBAUM M.D.
NPI 1659364511
Internal Medicine - Gastroenterology in Alexandria, VA

Active since August 25, 2005PECOS EnrolledAccepts Medicare Assignment
85.17/100
CMS Quality Rating
6355 WALKER LN, SUITE # 309, ALEXANDRIA, VA 22310(703) 313-8400(703) 313-9666 Get Directions Write a Review

NPPES record last updated: March 2, 2014. Verified against the NPPES registry weekly; last sync: July 19, 2026.

About Dr. Robert Alan Nussbaum M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ROBERT ALAN NUSSBAUM M.D. (NPI 1659364511) is an individual gastroenterology provider in Alexandria, Virginia, licensed in Virginia (0101047887) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Inova Alexandria Hospital, and is a graduate of Icahn School Of Medicine At Mount Sinai (1986).

NPPES Registry Identity

NPI1659364511
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameDR. ROBERT ALAN NUSSBAUMCredential: M.D.
Location Address6355 WALKER LN, SUITE # 309Alexandria, VA 22310-3245
Mailing Address6355 Walker Ln, Suite # 309Alexandria, VA 22310-3245 · (703) 313-8400 · Fax (703) 313-9666
Phone(703) 313-8400
Fax(703) 313-9666
Sole ProprietorYes
Medical School CMSIcahn School Of Medicine At Mount SinaiGraduated 1986
Enumeration DateAugust 25, 2005
Last NPPES UpdateMarch 2, 2014
✔ NPI 1659364511 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in VA · 0101047887
Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

6355 WALKER LN, Alexandria, VA 22310
Open in Google Maps ↗

Other Identifiers 3

Medicare ID-Type Unspecified686223
Medicaid5806372VA
Medicare UPINE97454

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Robert Alan Nussbaum M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9638345572
PECOS Enrollment IDI20111227000661
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 49D0968758

Robert A Nussbaum MD PC · Alexandria, VA
Expired · Dec 20, 2025
CLIA Number49D0968758
Laboratory TypePhysician Office
Certificate Effective DateDecember 21, 2023
Certificate Expiration DateDecember 20, 2025
Laboratory DirectorRobert A. Nussbaum MD
Laboratory Phone(703) 313-8400
Laboratory LocationRobert A Nussbaum MD PC6355 Walker Lane - Suite 309, Alexandria, VA 22310
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory to perform only waived tests.

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit, 20-29 minutes 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
292 services233 patients
New patient office or other outpatient visit, 30-44 minutes 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
230 services230 patients
Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385
This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.
228 services228 patients
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239
This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.
86 services82 patients
Biopsy of large bowel using a flexible endoscope 45380
A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.
64 services64 patients
Colorectal cancer screening; colonoscopy on individual at high risk G0105
Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.
30 services30 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Inova Alexandria Hospital

Acute Care Hospitals · Alexandria, VA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number490040
Location4320 Seminary RdAlexandria, VA 22304 · Alexandria City County
Emergency services Birthing friendly

Inova Fairfax Hospital

Acute Care Hospitals · Falls Church, VA
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number490063
Location3300 Gallows RoadFalls Church, VA 22042 · Fairfax County
Emergency services Birthing friendly

Inova Mount Vernon Hospital

Acute Care Hospitals · Alexandria, VA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number490122
Location2501 Parkers LaneAlexandria, VA 22306 · Fairfax County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 22310 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$147.85 typical visit price
range $65.18 – $194.86
Typical copayment $36.96 (range $16.29 – $48.71)
Most-billed visit code 99204
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

85.17/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Individually scored
Quality100
Promoting Interoperability100
Improvement Activities40
Cost50.57

Reported Quality Measures

Advance Care Plan
98%698 patients4/55-star benchmark: 100%
Colorectal Cancer Screening
93%1,242 patients5/55-star benchmark: 88%
Controlling High Blood Pressure
81%584 patients4/55-star benchmark: 91%
Diabetes: Hemoglobin A1c (HbA1c) Poor Control (>9%)
Lower rates are better for this measure.
100%212 patients1/55-star benchmark: 91%
Documentation of Current Medications in the Medical Record
100%1,942 patients5/55-star benchmark: 100%
e-Prescribing
99%537 patients4/55-star benchmark: 100%
Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan
81%1,616 patients4/55-star benchmark: 98%
Preventive Care and Screening: Screening for High Blood Pressure and Follow-Up Documented
30%1,198 patients2/55-star benchmark: 61%
Preventive Care and Screening: Tobacco Use: Screening and Cessation Intervention
Patients screened: 98% · 248 patients
96%248 patients
Provide Patients Electronic Access to Their Health Information
93%568 patients4/55-star benchmark: 100%
Statin Therapy for the Prevention and Treatment of Cardiovascular Disease
88%352 patients4/55-star benchmark: 91%
Use of High-Risk Medications in Older Adults
Lower rates are better for this measure.
Patients appropriateDiagnosis: 0% · 722 patients
Patients totalRate: 2% · 722 patients
2%722 patients4/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

IYAD S SAIDI MD. PHD
Otolaryngology (Otolaryngic Allergy)
6355 WALKER LN, STE 308
ALEXANDRIA, VA 22310
Fairfax County (703) 313-7700
M TAREK ORFALY MD
Otolaryngology (Otolaryngic Allergy)
6355 WALKER LN, STE 308
ALEXANDRIA, VA 22310
Fairfax County (703) 313-7700
ANNIK ADAMSON D.P.M.
Podiatrist
6355 WALKER LN, STE 503
ALEXANDRIA, VA 22310
Fairfax County (703) 822-0895
DR. NORMAN TACKTILL MD
Obstetrics & Gynecology
6355 WALKER LN, SUITE 408
ALEXANDRIA, VA 22310
Fairfax County (703) 719-5901
MICHELLE GRIGGS MSPT
Physical Therapist
6355 WALKER LN, SUITE 507
ALEXANDRIA, VA 22310
Fairfax County (703) 822-0039
MARIE ELIZABETH DIERKS D.O.
Pediatrics
6355 WALKER LN
ALEXANDRIA, VA 22310
Fairfax County (703) 924-2100
DR. H ERIC STERN M.D.
Obstetrics & Gynecology
6355 WALKER LN, SUITE 508
ALEXANDRIA, VA 22310
Fairfax County (703) 971-7633
DR. VINCENT ANTHONY POLICELLI M.D.
Obstetrics & Gynecology
6355 WALKER LN, SUITE 508
ALEXANDRIA, VA 22310
Fairfax County (703) 971-7633

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Robert Nussbaum's NPI number?

The NPI number for Robert Nussbaum is 1659364511. It was assigned to this individual provider in the NPPES registry on August 25, 2005.

Where is Robert Nussbaum located?

Robert Nussbaum practices at 6355 Walker Ln Suite # 309, Alexandria, VA 22310. The listed phone number is (703) 313-8400.

What is Robert Nussbaum's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Robert Nussbaum enrolled in Medicare?

Yes. Robert Nussbaum is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Is Robert Nussbaum affiliated with any hospitals?

According to CMS data, Robert Nussbaum is affiliated with Inova Alexandria Hospital, Inova Fairfax Hospital and Inova Mount Vernon Hospital.

When was this NPI record last updated?

The NPPES record for Robert Nussbaum was last updated on March 2, 2014. NPI Profile syncs with the weekly NPPES data releases published by CMS.