Sean S To, M.D.
With over 28 years in internal medicine, Sean S to, M.D. is a long-established internist in Chino. Trained at R Franklin University of Med & Sci/Chicago Medical School (class of 1998), he has been practicing for over 28 years. Among his Medicare patients, common conditions include hypertension, high cholesterol, and diabetes (per CMS data). CMS MIPS quality score: 83.68/100 (2023).
At a glance
- Prescribes opioids less than 33% of reporting doctors in California
- Uses generic medications more than 57% of reporting doctors in California
- Federal MIPS score higher than 50% of MIPS-scored doctors in California
- Virtual visits available — no app or travel required
Older · 2097dNPPES updated 2020-08-08 · verify on CMS
Contact & Location
Practice Location
5562 Philadelphia St Ste 201, Chino, CA 91710-2482
How Does This Doctor Compare?
Based on Medicare data, this doctor has an average quality score compared to other doctors in California, prescribes opioid pain medications conservatively, favors affordable generic drugs over brand-name ones.
MIPS Score
202383.68/100
California avg: 78.6 · US avg: 83.6
✓ Higher than most doctors nationally(+0.1 pts)
Average range among MIPS-scored doctors in CaliforniaHow the government rates this doctor's Medicare care quality. Scores above 75 are considered good.
Opioid Rx
↓ Lower = better2.61%
California avg: 5.2 · US avg: 5.1
✓ Higher than most doctors nationally(-2.5 pts)
2.61% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better88.9%
California avg: 83.3 · US avg: 82.8
✓ Higher than most doctors nationally(+6.1 pts)
Typical range among reporting doctors in CaliforniaHow often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
402
Unique beneficiaries
Standard volumePrescription Recipients
838
Patients prescribed
Prescriptions Written
8,154
Total claims
Total Medicare drug cost: $686k
Percentile rankings compared against 9,360 reporting peers in California.
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 Diabetes.
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
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-15%) — less common here
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↑ More patients than average (+3%) — a focus area for this doctor
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
US avg: 31.7%↓ Fewer patients than average (-8%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$1.3k received from industry
50 transactions reported in 2024 ·Moderate 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 Sean S to's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1998
R Franklin University of Med & Sci/Chicago Medical School
Board certified · Aug 7, 2020
CMS-verified certification date
28 years in practice
Experienced
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
R Franklin University of Med & Sci/Chicago Medical School (Class of 1998)
Mailing address
1317 S Diamond Bar Blvd Unit 4462, Diamond Bar, CA 91765-5620
Differs from practice location
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 190118
View hospital on Medicare Care CompareVirtual Internal Medicine Care With Sean S to
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Sean S to for blood pressure monitoring, cholesterol management, diabetes check-ins — no travel to Chino 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 Sean S to
NPI records show Dr. To as active with telehealth listed in Chino, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (909) 988-1000.
Sourced from CMS NPPES · OIG LEIE · CMS QPP 2023 · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Sean S to
Practice Location
5562 Philadelphia St Ste 201, Chino, CA 91710-2482
Mailing Address
1317 S Diamond Bar Blvd Unit 4462, Diamond Bar, CA 91765-5620
This is a provider directory. Contact the office directly to schedule appointments.
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