Dr. Johnny Nguyen Do , MD
Internal Medicine โข Orange, CA
1100 W Stewart Dr
Orange, CA 928683849
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
-
NPI assigned on March 31, 2009; this date does not establish years in practice.
-
Published CMS data list 591 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.
-
Published Part B service records, 2024:
- 99232 โ Subsequent hospital care with moderate levelof medical decision making: 327 service units.
- 99223 โ Initial hospital care with moderate level of medical decision making: 105 service units.
- 99238 โ Hospital discharge day management: 90 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 4 records in the table ยท Guide: How to read Medicare Part B data
-
Published CMS data list 212 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.
-
Published Part D records, 2024:
- Cefdinir โ 30 prescription fills, including refills.
- Azithromycin โ 23 prescription fills, including refills.
- Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) โ 23 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 12 records in the table ยท Guide: How to read Medicare Part D prescriber data
-
Close to the middle for Medicare Part B services among clinicians listed under Internal Medicine in Orange, CA (2024, 93 clinicians with data). Median for this group: 635. Middle half: 264 to 1,135.
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.
-
Medicare Part B services went from 809 in 2020 to 591 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
1100 W Stewart Dr
Orange, CA 928683849
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Spokane, WA. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: Providence Medical Foundation. 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
Eastern Virginia Medical School
2007
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
227 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 $61,410 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 $47,067 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
222 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
$1,150 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.
Open Payments general payments, program year 2025
All general payments: $87.95 across 3 records.
By nature of payment
- Food and Beverage: $87.95 across 3 records.
Reporting-company totals
- Pfizer Inc.: $65.11 across 2 records.
- Salix Pharmaceuticals, a division of Bausch Health US, LLC: $22.84 across 1 record.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
19 years (graduated 2007)
CMS Doctors and Clinicians data list 2007 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
2009
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
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. Do 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. Do 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 Orange 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 Orange, CA (2024, 93 clinicians with data). Median for this group: 635. Middle half: 264 to 1,135.
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
Close to the middle for clinicians listed under Internal Medicine in Orange, CA (2024, 93 clinicians with data). Median for this group: $62,483. Middle half: $30,626 to $94,764.
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 Orange, CA (2024, 93 clinicians with data). Median for this group: $47,067. Middle half: $22,228 to $74,251.
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
Fewer Part D prescriptions than 60% of clinicians listed under Internal Medicine in Orange, CA (2024, 109 clinicians with data). Median for this group: 546. Middle half: 101 to 2,251.
Fewer Part D prescriptions than 70% 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 lower Part D drug cost than 80% of clinicians listed under Internal Medicine in Orange, CA (2024, 109 clinicians with data). Median for this group: $50,471. Middle half: $3,602 to $217,115.
A lower Part D drug cost than 80% 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 Orange, CA (17,717 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Orange
23.5% of these 187 clinicians have the CMS telehealth indicator.
62% 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.
-
Medicare Part B services
Medicare Part B services decreased 27% from 809 in 2020 to 591 in 2024.
- 2020: 809
- 2021: 622
- 2022: 581
- 2023: 632
- 2024: 591
-
Medicare-allowed amount
Medicare-allowed amount decreased 30% from $87,843 in 2020 to $61,410 in 2024.
- 2020: $87,843
- 2021: $65,502
- 2022: $59,858
- 2023: $69,909
- 2024: $61,410
-
Paid by Medicare
Paid by Medicare decreased 32% from $69,681 in 2020 to $47,067 in 2024.
- 2020: $69,681
- 2021: $50,709
- 2022: $46,938
- 2023: $53,848
- 2024: $47,067
-
Medicare Part D prescriptions
Medicare Part D prescriptions increased 44% from 147 in 2020 to 212 in 2024.
- 2020: 147
- 2021: 125
- 2022: 139
- 2023: 239
- 2024: 212
-
30-day fills
30-day fills increased 48% from 150 in 2020 to 222 in 2024.
- 2020: 150
- 2021: 132
- 2022: 139
- 2023: 241
- 2024: 222
-
Part D drug cost
Part D drug cost decreased 15% from $1,347 in 2020 to $1,150 in 2024.
- 2020: $1,347
- 2021: $1,180
- 2022: $1,774
- 2023: $13,322
- 2024: $1,150
-
Industry payments (Open Payments)
Industry payments (Open Payments) went from $383.61 in 2021 to $87.95 in 2025.
- 2021: $383.61
- 2022: $98.62
- 2023: $200.64
- 2024: $76.24
- 2025: $87.95
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), 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 2025 (payments made January 1 โ December 31, 2025): fewer than 11 records totaling $87.95.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Pfizer Inc. |
Food and Beverage
In-kind items and services
|
ELIQUIS | General | $32.86 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
|
ELIQUIS | General | $32.25 |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC |
Food and Beverage
In-kind items and services
|
XIFAXAN | General | $22.84 |
Source: CMS Open Payments, program year 2025, 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 2016โ2023 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, 2017โ2024; 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 |
|---|---|---|---|---|
|
99232
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
|
327 | 142 | $224.00 | $81.33 |
|
99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
|
105 | 103 | $493.00 | $178.63 |
|
99238
Hospital discharge day management, 30 minutes or less
|
90 | 89 | $234.00 | $84.68 |
|
99233
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
|
69 | 52 | $337.00 | $122.28 |
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 |
|---|---|---|---|---|---|
| Cefdinir | Cefdinir | 30 | 229 | $302.88 | 30 |
| Azithromycin | Azithromycin | 23 | 73 | $62.66 | 23 |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 23 | 197 | $128.68 | 23 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 19 | 72 | $105.87 | 19 |
| Atorvastatin Calcium | Atorvastatin Calcium | 18 | 600 | $55.89 | 18 |
| Carvedilol | Carvedilol | 17 | 570 | $33.92 | 17 |
| Prednisone | Prednisone | 16 | 337 | $81.41 | 15 |
| Ondansetron Odt | Ondansetron | 16 | 124 | $168.03 | 16 |
| Levofloxacin | Levofloxacin | 13 | 113 | $60.63 | 12 |
| Furosemide | Furosemide | 13 | 493 | $29.66 | 13 |
| Methylprednisolone | Methylprednisolone | 12 | 72 | $87.31 | 12 |
| Clopidogrel | Clopidogrel Bisulfate | 12 | 351 | $33.22 | 12 |
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: 2021-10-21NUCC 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.
NUCC Taxonomy Code: 208000000X
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
NUCC Taxonomy Code: 208M00000X
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20250220003244
OR
0042453359
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
Providence Medical Foundation
200 W Ctr St Promenade, Anaheim, CA 928053960
Providence Medical Foundation
1100 W Stewart Dr, Orange, CA 928683849
Phone: 7146339111
Providence Medical Foundation
1950 Sunny Crest Dr, Fullerton, CA 928353641
Phone: 7149925350
Secondary Practice Locations
5633 N Lidgerwood St
Spokane, WA 992081224
Phone: 5098680876
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Hospitalist
Doctor of Medicine (M.D.)
Emergency Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Adult Health
Nurse Practitioner
Hospitalist
Doctor of Osteopathic Medicine (D.O.)
Nurse Practitioner - Acute Care
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Internal Medicine (license number reported to NPPES: WA MD60335318)
Registered at 1100 W STEWART DR, ORANGE, CA 928683849 (Tel: 7147718000)
Internal Medicine (license number reported to NPPES: CA A107046)
NPI status registered as active in NPPES database
Registered at 5633 N LIDGERWOOD ST, SPOKANE, WA 992081224 (Tel: 5098680876)
Registered at 5633 N LIDGERWOOD ST, SPOKANE, WA 992081224 (Tel: 5098680876)
Recorded as JOHNNY DO, M.D.
Internal Medicine (license number reported to NPPES: WA MD60335318)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Orange
- Dr. Yadani Al-Saleh, MD
- Dr. Mansi Kothari, MD
- Dr. Rene Patino, MD
- Dr. Tai Truong, MD
- Dr. Anastasia Haddad, MD
- Dr. Suma Srinath, MD
Mailing Address
5633 N Lidgerwood St
Spokane, WA 992081224
Phone: 5098680876