Stephen Masato Oishi, M.D.
Stephen Masato Oishi is an Internal Medicine specialist based in Honolulu, HI with over 42 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
With over 42 years in internal medicine, Stephen Masato Oishi, M.D. is a long-established internist in Honolulu. Trained at Georgetown University School of Medicine (class of 1984), he has been practicing for over 42 years. Among his Medicare patients, common conditions include hypertension, high cholesterol, and kidney disease (per CMS data).
At a glance
- Uses generic medications more than 36% of reporting doctors in Hawaii
- Virtual visits available — no app or travel required
Older · 6895dNPPES updated 2007-07-08 · verify NPI on CMS · Verify license at Hawaii Medical Board
Contact & Location
Practice Location
321 N Kuakini St Suite #201, Honolulu, HI 96817-2364
How Does This Doctor Compare?
Based on Medicare data, this doctor favors affordable generic drugs over brand-name ones.
Generic Rx
↑ Higher = better83.8%
Hawaii avg: 81.8 · US avg: 82.8
✓ Higher than most doctors nationally(+1 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
268
Unique beneficiaries
Standard volumePrescription Recipients
422
Patients prescribed
Prescriptions Written
4,666
Total claims
Total Medicare drug cost: $1.03M
Percentile rankings compared against 262 reporting peers in Hawaii.
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 Hypertension, High Cholesterol, and Chronic Kidney Disease.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+5%) — a focus area for this doctor
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+5%) — a focus area for this doctor
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↑ More patients than average (+45%) — a focus area for this doctor
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↑ More patients than average (+3%) — a focus area for this doctor
Weakened bones that are more prone to fractures, common in older adults
US avg: 18.1%↑ More patients than average (+17%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-25%) — less common here
Diseases involving abnormal cell growth with potential to spread to other body parts
US avg: 20.8%↑ More patients than average (+2%) — a focus area for this doctor
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$82 received from industry
3 transactions reported in 2024 ·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 2024, attributed to Stephen Masato Oishi's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1984
Georgetown University School of Medicine
42 years in practice
Senior practitioner
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Taxonomy: 207R00000X
Education & Training
Georgetown University School of Medicine (Class of 1984)
Virtual Internal Medicine Care With Stephen Masato Oishi
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Stephen Masato Oishi for blood pressure monitoring, cholesterol management, kidney care follow-ups — no travel to Honolulu 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 Stephen Masato Oishi
NPI records show Dr. Oishi as active with telehealth listed in Honolulu, HI. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (808) 523-8611.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Stephen Masato Oishi
Practice Location
321 N Kuakini St Suite #201, Honolulu, HI 96817-2364
Mailing Address
321 N Kuakini St Suite #201, Honolulu, HI 96817-2364
This is a provider directory. Contact the office directly to schedule appointments.
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