Norman Shizuaki Nishioka, MD
Gastroenterology Internal Medicine
Norman Shizuaki Nishioka is a Gastroenterology Internal Medicine specialist based in Boston, MA with over 45 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Also practices: INTERNAL MEDICINE
Patients across MA can see Norman Shizuaki Nishioka, MD in person in Boston or via virtual visit — no travel required. He graduated from University of California, Geffen School of Medicine in 1981 and has 45+ years of clinical experience. He regularly sees Medicare patients with high cholesterol, hypertension, and arthritis (per CMS claims data).
At a glance
- Uses generic medications more than 82% of reporting doctors in Massachusetts
- Virtual visits available — no app or travel required
Older · 258dNPPES updated 2025-09-11 · verify NPI on CMS · Verify license at Massachusetts Board of Registration in Medicine
Contact & Location
Practice Location
55 Fruit St Gastroenterology Associates Blk 4, Boston, MA 02114-2621
How Does This Doctor Compare?
Based on Medicare data, this doctor favors affordable generic drugs over brand-name ones.
Generic Rx
↑ Higher = better93.7%
Massachusetts avg: 81.9 · US avg: 82.8
✓ Higher than most doctors nationally(+10.9 pts)
Better than 82% of reporting doctors in MassachusettsHow often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
816
Unique beneficiaries
High volumePrescription Recipients
436
Patients prescribed
Prescriptions Written
600
Total claims
Total Medicare drug cost: $24k
Percentile rankings compared against 1,606 reporting peers in Massachusetts.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages High Cholesterol, Hypertension, and Arthritis.
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+1%) — a focus area for this doctor
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↓ Fewer patients than average (-7%) — less common here
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-6%) — less common here
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
US avg: 31.7%↓ Fewer patients than average (-5%) — less common here
Diseases involving abnormal cell growth with potential to spread to other body parts
US avg: 20.8%↑ More patients than average (+5%) — a focus area for this doctor
Excessive worry or fear that interferes with daily life
US avg: 34.1%↓ Fewer patients than average (-13%) — less common here
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↓ Fewer patients than average (-14%) — less common here
Conditions affecting emotional state, including depression and bipolar disorder
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$20 received from industry
3 transactions reported in 2018 ·Low tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2018, attributed to Norman Shizuaki Nishioka's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1981
David Geffen School of Medicine at Ucla
45 years in practice
Senior practitioner
Gastroenterologists diagnose and treat digestive system disorders including GERD, irritable bowel syndrome (IBS), inflammatory bowel disease (Crohn's, ulcerative colitis), liver disease, pancreatitis, and colon polyps. They perform endoscopies and colonoscopies.
Taxonomy: 207RG0100X
Education & Training
University of California, Geffen School of Medicine (Class of 1981)
Mailing address
Po Box 9142 Mass General Physician Organization, Charlestown, MA 02129-9142
Differs from practice location
Virtual Internal Medicine Care With Norman Shizuaki Nishioka
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Norman Shizuaki Nishioka for cholesterol management, blood pressure monitoring, arthritis follow-ups — no travel to Boston required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Norman Shizuaki Nishioka
NPI records show Dr. Nishioka as active with telehealth listed in Boston, MA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (617) 726-4422.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2018 · CMS Physician Comparator. See Data Methodology.
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Contact Norman Shizuaki Nishioka
Practice Location
55 Fruit St Gastroenterology Associates Blk 4, Boston, MA 02114-2621
Mailing Address
Po Box 9142 Mass General Physician Organization, Charlestown, MA 02129-9142
This is a provider directory. Contact the office directly to schedule appointments.
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