Dr. Shelly C. Thio , MD
Internal Medicine • Riverside, CA
10800 Magnolia Ave
Riverside, CA 925053043
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on December 8, 2006; this date does not establish years in practice.
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Published CMS data list 5,838 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Atorvastatin Calcium — 787 prescription fills, including refills.
- Lisinopril — 351 prescription fills, including refills.
- Amlodipine Besylate — 321 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 84 records in the table · Guide: How to read Medicare Part D prescriber data
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More Part D prescriptions than 70% of clinicians listed under Internal Medicine in Riverside, CA (2024, 122 clinicians with data). Median for this group: 1,417. Middle half: 143 to 6,064.
More Part D prescriptions than 80% of clinicians listed under Internal Medicine in California (2024, 10,795 clinicians with data). Median for this group: 1,254. Middle half: 150 to 4,240.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 5,648 in 2020 to 5,838 in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020–2024.
Practice Location & Contact Primary Location
10800 Magnolia Ave
Riverside, CA 925053043
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Southern California Permanente Medical Group. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
Loma Linda University School Of Medicine
1995
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
15,973 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$305,065 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
Years since graduation
31 years (graduated 1995)
CMS Doctors and Clinicians data list 1995 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Thio has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Thio as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Riverside and California
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
More Part D prescriptions than 70% of clinicians listed under Internal Medicine in Riverside, CA (2024, 122 clinicians with data). Median for this group: 1,417. Middle half: 143 to 6,064.
More Part D prescriptions than 80% of clinicians listed under Internal Medicine in California (2024, 10,795 clinicians with data). Median for this group: 1,254. Middle half: 150 to 4,240.
Part D drug cost
A higher Part D drug cost than 70% of clinicians listed under Internal Medicine in Riverside, CA (2024, 122 clinicians with data). Median for this group: $71,418. Middle half: $4,122 to $376,393.
A higher Part D drug cost than 70% of clinicians listed under Internal Medicine in California (2024, 10,795 clinicians with data). Median for this group: $88,105. Middle half: $7,557 to $307,080.
187 active clinicians are listed under Internal Medicine with a practice address in Riverside, CA (17,717 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Riverside
20.9% of these 187 clinicians have the CMS telehealth indicator.
72.7% of these 187 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions stayed about the same: 5,648 in 2020 and 5,838 in 2024.
- 2020: 5,648
- 2021: 6,105
- 2022: 5,881
- 2023: 6,105
- 2024: 5,838
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30-day fills
30-day fills stayed about the same: 14,779 in 2020 and 15,973 in 2024.
- 2020: 14,779
- 2021: 16,063
- 2022: 15,857
- 2023: 16,325
- 2024: 15,973
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Part D drug cost
Part D drug cost increased 44% from $212,195 in 2020 to $305,065 in 2024.
- 2020: $212,195
- 2021: $261,501
- 2022: $276,748
- 2023: $267,312
- 2024: $305,065
Sources: CMS Medicare Part D Prescribers (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 787 | 74,063 | $8,965.63 | 273 |
| Lisinopril | Lisinopril | 351 | 31,584 | $4,853.47 | 120 |
| Amlodipine Besylate | Amlodipine Besylate | 321 | 28,923 | $3,933.69 | 112 |
| Losartan Potassium | Losartan Potassium | 309 | 28,330 | $4,309.48 | 107 |
| Levothyroxine Sodium | Levothyroxine Sodium | 280 | 22,756 | $4,651.27 | 87 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 276 | 23,494 | $2,930.98 | 89 |
| Atenolol | Atenolol | 200 | 18,419 | $2,526.52 | 61 |
| Metformin Hcl | Metformin Hcl | 193 | 18,079 | $2,269.68 | 68 |
| Omeprazole | Omeprazole | 139 | 12,524 | $1,371.68 | 56 |
| Glipizide | Glipizide | 132 | 11,697 | $1,625.45 | 43 |
| Hydrochlorothiazide | Hydrochlorothiazide | 130 | 12,330 | $1,427.10 | 47 |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 124 | 10,685 | $1,609.47 | 42 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 114 | 4,056 | $2,052.36 | 61 |
| Metoprolol Tartrate | Metoprolol Tartrate | 102 | 8,588 | $1,047.06 | 32 |
| Potassium Chloride | Potassium Chloride | 90 | 8,632 | $3,780.07 | 38 |
| Pantoprazole Sodium | Pantoprazole Sodium | 89 | 6,738 | $1,121.31 | 31 |
| Pradaxa | Dabigatran Etexilate Mesylate | 89 | 5,871 | $19,914.95 | 31 |
| Gabapentin | Gabapentin | 88 | 7,049 | $1,914.00 | 35 |
| Alendronate Sodium | Alendronate Sodium | 87 | 7,250 | $852.60 | 31 |
| Allopurinol | Allopurinol | 77 | 7,510 | $986.31 | 26 |
| Hydralazine Hcl | Hydralazine Hcl | 73 | 6,595 | $1,147.08 | 27 |
| Jardiance | Empagliflozin | 71 | 6,260 | $39,307.21 | 25 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 69 | 1,840 | $2,139.93 | 17 |
| Nano 2nd Gen Pen Needle | Pen Needle, Diabetic | 66 | 4,103 | $1,416.95 | 22 |
| Bisoprolol Fumarate | Bisoprolol Fumarate | 65 | 5,559 | $1,771.15 | 21 |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 207R00000X
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.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20050426001378
CA
8123067410
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Southern California Permanente Medical Group
10800 Magnolia Ave, Riverside, CA 925053043
Phone: 9513532000
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Family Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Internal Medicine - Critical Care Medicine
Doctor of Medicine (M.D.)
Anesthesiology
Doctor of Osteopathic Medicine (D.O.)
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated December 08, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Riverside
- Dr. John Agtuca, DO
- Dr. Tamara Lynne Aqui, DO
- Dr. Andrew Yang, MD
- Dr. Roger Cheng, MD
- Dr. Kathleen Keating, DO
- Dr. Kyi Myint, MBBS
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Directory navigation, in NPI number order.
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Mailing Address
10800 Magnolia Ave
Riverside, CA 925053043
Phone: 9093532000