Dr. Viona X Zhang , MD
Internal Medicine โข Riverside, CA
3390 University Ave Ste 100
Riverside, CA 925013315
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 March 24, 2016; this date does not establish years in practice.
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Published CMS data list 497 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99214 โ Established patient outpatient office visit: 156 service units.
- 99490 โ Chronic care management services: 130 service units.
- 99213 โ Established patient outpatient office visit: 106 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 6 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 1,088 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ 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 โ 221 prescription fills, including refills.
- Lisinopril โ 99 prescription fills, including refills.
- Amlodipine Besylate โ 93 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 28 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Close to the middle for Medicare Part B services among clinicians listed under Internal Medicine in Riverside, CA (2024, 76 clinicians with data). Median for this group: 445. Middle half: 145 to 681.
Close to the middle for Medicare Part B services among clinicians listed under Internal Medicine in California (2024, 8,005 clinicians with data). Median for this group: 547. Middle half: 197 to 1,242.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 227 in 2020 to 497 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
3390 University Ave Ste 100
Riverside, CA 925013315
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 2 distinct group names: Inova Physician Partners Llc; Regents Of The University Of California. 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
University Of Cincinnati College Of Medicine
2016
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
191 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $55,328 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Paid by Medicare
About $42,310 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
30-day fills
3,060 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
$48,160 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 โ by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $16.15 in 2024
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2024.
Years since graduation
10 years (graduated 2016)
CMS Doctors and Clinicians data list 2016 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
2016
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, โDoes your provider accept Medicare as full payment?โ
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Zhang 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. Zhang 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 B services
Close to the middle for clinicians listed under Internal Medicine in Riverside, CA (2024, 76 clinicians with data). Median for this group: 445. Middle half: 145 to 681.
Close to the middle for clinicians listed under Internal Medicine in California (2024, 8,005 clinicians with data). Median for this group: 547. Middle half: 197 to 1,242.
Medicare-allowed amount
A higher Medicare-allowed amount than 60% of clinicians listed under Internal Medicine in Riverside, CA (2024, 76 clinicians with data). Median for this group: $44,821. Middle half: $14,780 to $71,430.
Close to the middle for clinicians listed under Internal Medicine in California (2024, 8,005 clinicians with data). Median for this group: $57,391. Middle half: $20,415 to $125,751.
Paid by Medicare
Close to the middle for clinicians listed under Internal Medicine in Riverside, CA (2024, 76 clinicians with data). Median for this group: $33,796. Middle half: $10,896 to $56,959.
Close to the middle for clinicians listed under Internal Medicine in California (2024, 8,005 clinicians with data). Median for this group: $43,431. Middle half: $14,887 to $95,905.
Medicare Part D prescriptions
Close to the middle for 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.
Close to the middle for 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
Close to the middle for 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.
Close to the middle for 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 B services
Medicare Part B services increased 119% from 227 in 2020 to 497 in 2024.
- 2020: 227
- 2021: 313
- 2022: 620
- 2023: 597
- 2024: 497
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Medicare-allowed amount
Medicare-allowed amount increased 157% from $21,521 in 2020 to $55,328 in 2024.
- 2020: $21,521
- 2021: $31,046
- 2022: $71,220
- 2023: $67,287
- 2024: $55,328
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Paid by Medicare
Paid by Medicare increased 191% from $14,548 in 2020 to $42,310 in 2024.
- 2020: $14,548
- 2021: $24,083
- 2022: $54,732
- 2023: $50,980
- 2024: $42,310
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 75% from 620 in 2020 to 1,088 in 2024.
- 2020: 620
- 2021: 230
- 2022: 585
- 2023: 1,002
- 2024: 1,088
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30-day fills
30-day fills increased 143% from 1,257 in 2020 to 3,060 in 2024.
- 2020: 1,257
- 2021: 472
- 2022: 1,566
- 2023: 2,721
- 2024: 3,060
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Part D drug cost
Part D drug cost increased 56% from $30,887 in 2020 to $48,160 in 2024.
- 2020: $30,887
- 2021: $2,529
- 2022: $6,642
- 2023: $26,049
- 2024: $48,160
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $12.03 in 2019 to $16.15 in 2024.
- 2019: $12.03
- 2024: $16.15
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2024 (payments made January 1 โ December 31, 2024): fewer than 11 records totaling $16.15.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Vital Connect, Inc |
Food and Beverage
In-kind items and services
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VITALPATCH RTM | General | $16.15 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2018โ2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2019โ2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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156 | 109 | $289.00 | $145.94 |
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99490
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month
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130 | 19 | $113.00 | $70.98 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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106 | 93 | $191.00 | $103.80 |
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G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
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68 | 68 | $315.00 | $149.66 |
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G0008
Administration of influenza virus vaccine
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19 | 19 | $61.00 | $35.85 |
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90662
Influenza vaccine split virus, preservative free
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18 | 18 | $123.00 | $81.82 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
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 | 221 | 19,684 | $2,199.65 | 83 |
| Lisinopril | Lisinopril | 99 | 8,676 | $547.78 | 32 |
| Amlodipine Besylate | Amlodipine Besylate | 93 | 7,980 | $577.11 | 38 |
| Levothyroxine Sodium | Levothyroxine Sodium | 86 | 7,411 | $1,087.41 | 26 |
| Losartan Potassium | Losartan Potassium | 73 | 6,390 | $724.35 | 25 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 59 | 5,280 | $767.95 | 22 |
| Sertraline Hcl | Sertraline Hcl | 51 | 3,810 | $399.92 | 17 |
| Hydrochlorothiazide | Hydrochlorothiazide | 50 | 4,254 | $279.91 | 21 |
| Metoprolol Succinate | Metoprolol Succinate | 42 | 3,600 | $582.00 | 15 |
| Metformin Hcl Er | Metformin Hcl | 36 | 3,120 | $728.81 | 14 |
| Metformin Hcl | Metformin Hcl | 31 | 2,790 | $114.53 | 13 |
| Jardiance | Empagliflozin | 23 | 2,010 | $35,798.36 | โ |
| Bupropion Xl | Bupropion Hcl | 21 | 1,470 | $857.64 | โ |
| Duloxetine Hcl | Duloxetine Hcl | 19 | 1,590 | $600.39 | โ |
| Simvastatin | Simvastatin | 15 | 1,350 | $62.66 | โ |
| Alendronate Sodium | Alendronate Sodium | 15 | 1,260 | $61.30 | โ |
| Carvedilol | Carvedilol | 15 | 1,350 | $59.36 | โ |
| Fluoxetine Hcl | Fluoxetine Hcl | 15 | 1,264 | $61.42 | โ |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 14 | 286 | $348.06 | โ |
| Topiramate | Topiramate | 13 | 748 | $24.40 | โ |
| Escitalopram Oxalate | Escitalopram Oxalate | 13 | 1,170 | $114.21 | โ |
| Trazodone Hcl | Trazodone Hcl | 13 | 886 | $123.13 | โ |
| Gabapentin | Gabapentin | 12 | 600 | $85.61 | โ |
| Allopurinol | Allopurinol | 12 | 1,080 | $126.71 | โ |
| Montelukast Sodium | Montelukast Sodium | 12 | 1,080 | $263.69 | โ |
(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
Self-certified to NPPES: 2025-12-16NUCC 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.
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
I20251228000150
CA
3779878186
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
Inova Physician Partners Llc
3833 Fairfax Dr, Arlington, VA 222031773
Phone: 7035258863
Regents Of The University Of California
3390 University Ave, Riverside, CA 925013315
Phone: 9518277793
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine
Doctor of Medicine (M.D.)
Psychologist - Clinical
Doctor of Psychology (Psy.D.)
Family Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 3390 UNIVERSITY AVE STE 100, RIVERSIDE, CA 925013315 (Tel: 9518277793)
Registered at 3390 UNIVERSITY AVE STE 100, RIVERSIDE, CA 925013315 (Tel: 9518277793)
Internal Medicine (license number reported to NPPES: VA 0101270412)
Registered at 3833 FAIRFAX DR STE 200, ARLINGTON, VA 222031773 (Tel: 7035258863)
Registered at PO BOX 37189, BALTIMORE, MD 212973189 (Tel: 5714235699)
Recorded as VIONA ZHANG, MD
NPI status registered as active in NPPES database
Registered at 395 W 12TH AVE, THIRD FLOOR, COLUMBUS, OH 432101267 (Tel: 6142933989)
Registered at 395 W 12TH AVE, THIRD FLOOR, COLUMBUS, OH 432101267 (Tel: 6142933989)
Recorded as VIONA ZHANG
Internal Medicine (license number reported to NPPES: OH 57027666)
NPI status registered as active in NPPES database
Registered at 410 W 10TH AVE, COLUMBUS, OH 432101240 (Tel: 6142933989)
Registered at 4931 BRASHER AVE, BLUE ASH, OH 452423903 (Tel: 5132373040)
Recorded as VIONA ZHANG
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Riverside
- Dr. Sanu John, DO
- Dr. Humera Rana, MD
- Dr. Kathleen Fanning, MD
- Dr. Mohammad Kharazmi, MD
- Dr. Kevin Vu, MD
- Dr. Rachel Chiang, MD
Mailing Address
3390 University Ave Ste 100
Riverside, CA 925013315
Phone: 9518277793