Dr. John-Khoa Do , DO
Internal Medicine β’ Downey, CA
10000 Lakewood Blvd
Downey, CA 902404020
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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Dr. John-Khoa Do is listed in NPPES under Internal Medicine.
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NPI assigned on July 21, 2006; this date does not establish years in practice.
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Published CMS data list 6,878 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers β 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 β 652 prescription fills, including refills.
- Losartan Potassium β 360 prescription fills, including refills.
- Hydralazine Hcl β 291 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 120 records in the table Β· Guide: How to read Medicare Part D prescriber data
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More Part D prescriptions than 90% of clinicians listed under Internal Medicine in Downey, CA (2024, 81 clinicians with data). Median for this group: 421. Middle half: 117 to 3,401.
More Part D prescriptions than 85% 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 β by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 1,126 in 2020 to 6,878 in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2020β2024.
Practice Location & Contact Primary Location
10000 Lakewood Blvd
Downey, CA 902404020
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
15,086 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
$607,191 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 β by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $351.55 across 9 records.
By nature of payment
- Food and Beverage: $351.55 across 9 records.
Reporting-company totals
- Eli Lilly and Company: $158.20 across 3 records.
- Novo Nordisk Inc: $153.79 across 4 records.
- Merck Sharp & Dohme LLC: $39.56 across 2 records.
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).
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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, βDoes your provider accept Medicare as full payment?β
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 Downey and California
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
More Part D prescriptions than 90% of clinicians listed under Internal Medicine in Downey, CA (2024, 81 clinicians with data). Median for this group: 421. Middle half: 117 to 3,401.
More Part D prescriptions than 85% 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 90% of clinicians listed under Internal Medicine in Downey, CA (2024, 81 clinicians with data). Median for this group: $19,488. Middle half: $3,434 to $190,253.
A higher Part D drug cost than 85% 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.
114 active clinicians are listed under Internal Medicine with a practice address in Downey, CA (17,717 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Downey
10.5% of these 114 clinicians have the CMS telehealth indicator.
63.2% of these 114 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 increased 511% from 1,126 in 2020 to 6,878 in 2024.
- 2020: 1,126
- 2021: 916
- 2022: 910
- 2023: 2,890
- 2024: 6,878
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30-day fills
30-day fills increased 1009% from 1,360 in 2020 to 15,086 in 2024.
- 2020: 1,360
- 2021: 1,268
- 2022: 1,265
- 2023: 5,638
- 2024: 15,086
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Part D drug cost
Part D drug cost increased 1648% from $34,745 in 2020 to $607,191 in 2024.
- 2020: $34,745
- 2021: $22,005
- 2022: $33,552
- 2023: $214,031
- 2024: $607,191
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $18.72 in 2019 to $351.55 in 2025.
- 2019: $18.72
- 2022: $126.25
- 2023: $209.28
- 2024: $173.73
- 2025: $351.55
Sources: 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 Β· 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 β December 31, 2025): fewer than 11 records totaling $351.55.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Eli Lilly and Company |
Food and Beverage
Cash or cash equivalent
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ZEPBOUND | General | $114.20 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Wegovy | General | $112.53 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $22.16 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $21.84 |
| Merck Sharp & Dohme LLC |
Food and Beverage
In-kind items and services
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GARDASIL 9 | General | $20.81 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Ozempic | General | $19.83 |
| Merck Sharp & Dohme LLC |
Food and Beverage
In-kind items and services
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GARDASIL 9 | General | $18.75 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Ozempic | General | $10.75 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Ozempic | General | $10.68 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
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 | 652 | 52,256 | $2,738.09 | 228 |
| Losartan Potassium | Losartan Potassium | 360 | 30,790 | $864.74 | 133 |
| Hydralazine Hcl | Hydralazine Hcl | 291 | 16,235 | $2,228.40 | 105 |
| Amlodipine Besylate | Amlodipine Besylate | 269 | 21,269 | $299.69 | 97 |
| Metformin Hcl | Metformin Hcl | 237 | 18,122 | $644.59 | 81 |
| Gabapentin | Gabapentin | 222 | 10,661 | $1,250.59 | 72 |
| Nifedipine Er | Nifedipine | 217 | 16,911 | $5,100.37 | 73 |
| Levothyroxine Sodium | Levothyroxine Sodium | 203 | 15,648 | $4,304.82 | 67 |
| Omega-3 Acid Ethyl Esters | Omega-3 Acid Ethyl Esters | 201 | 9,598 | $2,440.80 | 57 |
| Alendronate Sodium | Alendronate Sodium | 188 | 14,274 | $547.26 | 80 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 176 | 5,324 | $1,167.42 | 86 |
| Lisinopril | Lisinopril | 168 | 12,772 | $373.24 | 58 |
| Furosemide | Furosemide | 150 | 10,321 | $346.68 | 61 |
| Tamsulosin Hcl | Tamsulosin Hcl | 150 | 11,408 | $757.03 | 52 |
| Ozempic | Semaglutide | 131 | 5,287 | $171,729.86 | 36 |
| Eliquis | Apixaban | 118 | 4,465 | $86,891.86 | 38 |
| Omeprazole | Omeprazole | 106 | 8,452 | $258.80 | 46 |
| Metoprolol Succinate | Metoprolol Succinate | 96 | 7,890 | $395.15 | 41 |
| Jardiance | Empagliflozin | 85 | 6,490 | $128,296.55 | 42 |
| Famotidine | Famotidine | 83 | 6,680 | $495.29 | 28 |
| Pantoprazole Sodium | Pantoprazole Sodium | 82 | 5,715 | $1,114.64 | 34 |
| Metoprolol Tartrate | Metoprolol Tartrate | 81 | 5,693 | $243.26 | 32 |
| Glimepiride | Glimepiride | 80 | 6,271 | $194.07 | 30 |
| Diclofenac Sodium | Diclofenac Sodium | 77 | 1,890 | $178.27 | 34 |
| Hydrochlorothiazide | Hydrochlorothiazide | 76 | 5,376 | $163.10 | 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 PECOSORDER AND REFERRING ONLY - INTERNAL MEDICINE
I20160205001782
CA
0042310377
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner - Family
Family Nurse Practitioner (Certified)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner
Nurse Practitioner
Nurse Practitioner - Family
Family Nurse Practitioner (Board Certified)
Internal 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 10000 LAKEWOOD BLVD, DOWNEY, CA 902404020 (Tel: 5628623684)
Registered at 12900 PARK PLAZA DR STE 150, CERRITOS, CA 907039329 (Tel: 5629774639)
NPI status registered as active in NPPES database
Registered at 8821 ABERDEEN LN, GARDEN GROVE, CA 928412305 (Tel: 7143301875)
Registered at 10000 LAKEWOOD BLVD, DOWNEY, CA 902404020 (Tel: 5628623684)
Recorded as JOHN-KHOA DO, D.O.
Internal Medicine (license number reported to NPPES: CA 20A8905)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Downey
- Dr. Hillary Lansman, DO
- Dr. Narayana Gunda, MD
- Dr. Stanley Crittenden, MD
- Dr. John Terence So, MD
- Dr. Mihaela Chelu, MD
- Dr. Jose Anguiano, MD
Mailing Address
12900 Park Plaza Dr Ste 150
Cerritos, CA 907039329
Phone: 5629774639