Dr. Yeming Sun , MD
Internal Medicine • Irvine, CA
113 Waterworks Way, #125
Irvine, CA 926183168
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 January 21, 2006; this date does not establish years in practice.
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Published CMS data list 110 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – 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 — Established patient outpatient office visit: 110 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See the full table · Guide: How to read Medicare Part B data
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Published CMS data list 2,072 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 — 319 prescription fills, including refills.
- Amlodipine Besylate — 219 prescription fills, including refills.
- Losartan Potassium — 170 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 52 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 90% of clinicians listed under Internal Medicine in Irvine, CA (2024, 63 clinicians with data). Median for this group: 665. Middle half: 307 to 952.
Fewer Medicare Part B services than 80% of 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 – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 188 in 2020 to 110 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
113 Waterworks Way
#125
Irvine, CA 926183168
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
1986
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
82 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 – by Provider, 2024.
Medicare-allowed amount
About $15,182 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 – by Provider and Service, 2024.
Paid by Medicare
About $11,635 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 – by Provider and Service, 2024.
30-day fills
5,407 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
$61,290 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)
Fewer than 11 payment records totaling $125.00 in 2025
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 2025.
Years since graduation
40 years (graduated 1986)
CMS Doctors and Clinicians data list 1986 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?”
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.
Can order Medicare-covered services
CMS lists Dr. Sun as eligible to order or refer durable medical equipment (DME) 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 Irvine and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 90% of clinicians listed under Internal Medicine in Irvine, CA (2024, 63 clinicians with data). Median for this group: 665. Middle half: 307 to 952.
Fewer Medicare Part B services than 80% of 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 lower Medicare-allowed amount than 85% of clinicians listed under Internal Medicine in Irvine, CA (2024, 63 clinicians with data). Median for this group: $52,053. Middle half: $30,500 to $92,261.
A lower Medicare-allowed amount than 75% of 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
A lower Medicare payment amount than 85% of clinicians listed under Internal Medicine in Irvine, CA (2024, 63 clinicians with data). Median for this group: $35,937. Middle half: $21,195 to $68,213.
A lower Medicare payment amount than 75% of 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
More Part D prescriptions than 65% of clinicians listed under Internal Medicine in Irvine, CA (2024, 94 clinicians with data). Median for this group: 793. Middle half: 196 to 2,984.
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 Irvine, CA (2024, 94 clinicians with data). Median for this group: $45,806. Middle half: $7,382 to $202,167.
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.
155 active clinicians are listed under Internal Medicine with a practice address in Irvine, CA (17,717 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Irvine
29% of these 155 clinicians have the CMS telehealth indicator.
63.9% of these 155 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 decreased 41% from 188 in 2020 to 110 in 2024.
- 2020: 188
- 2021: 89
- 2022: 81
- 2023: 116
- 2024: 110
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Medicare-allowed amount
Medicare-allowed amount decreased 13% from $17,375 in 2020 to $15,182 in 2024.
- 2020: $17,375
- 2021: $12,781
- 2022: $11,443
- 2023: $16,101
- 2024: $15,182
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Paid by Medicare
Paid by Medicare varied from year to year: $12,494 in 2020 and $11,635 in 2024.
- 2020: $12,494
- 2021: $10,110
- 2022: $8,676
- 2023: $11,976
- 2024: $11,635
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Medicare Part D prescriptions
Medicare Part D prescriptions varied from year to year: 2,262 in 2020 and 2,072 in 2024.
- 2020: 2,262
- 2021: 1,935
- 2022: 2,468
- 2023: 2,344
- 2024: 2,072
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30-day fills
30-day fills varied from year to year: 5,409 in 2020 and 5,407 in 2024.
- 2020: 5,409
- 2021: 4,713
- 2022: 6,016
- 2023: 5,671
- 2024: 5,407
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Part D drug cost
Part D drug cost decreased 37% from $97,543 in 2020 to $61,290 in 2024.
- 2020: $97,543
- 2021: $63,653
- 2022: $85,091
- 2023: $110,137
- 2024: $61,290
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $123.55 in 2019 to $125.00 in 2025.
- 2019: $123.55
- 2021: $100.00
- 2022: $100.00
- 2025: $125.00
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 · 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 – December 31, 2025): fewer than 11 records totaling $125.00.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
Vemlidy | General | $125.00 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 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 – by Provider and Service data, 2017–2024; 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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110 | 79 | $193.64 | $138.02 |
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 | 319 | 29,527 | $2,720.83 | 97 |
| Amlodipine Besylate | Amlodipine Besylate | 219 | 20,090 | $1,141.57 | 70 |
| Losartan Potassium | Losartan Potassium | 170 | 16,130 | $1,549.29 | 51 |
| Levothyroxine Sodium | Levothyroxine Sodium | 117 | 10,927 | $1,273.48 | 39 |
| Metformin Hcl | Metformin Hcl | 111 | 10,438 | $983.89 | 35 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 69 | 6,340 | $708.96 | 24 |
| Lisinopril | Lisinopril | 68 | 6,230 | $365.41 | 17 |
| Omeprazole | Omeprazole | 52 | 2,340 | $443.62 | 16 |
| Alendronate Sodium | Alendronate Sodium | 46 | 3,804 | $265.46 | 16 |
| Tamsulosin Hcl | Tamsulosin Hcl | 43 | 3,780 | $557.75 | 14 |
| Zolpidem Tartrate | Zolpidem Tartrate | 40 | 900 | $202.77 | 13 |
| Metoprolol Succinate | Metoprolol Succinate | 39 | 3,690 | $324.74 | 15 |
| Fluticasone Propionate | Fluticasone Propionate | 31 | 1,170 | $229.13 | 15 |
| Losartan-Hydrochlorothiazide | Losartan/Hydrochlorothiazide | 30 | 2,810 | $279.20 | — |
| Atenolol | Atenolol | 29 | 2,760 | $191.18 | — |
| Azithromycin | Azithromycin | 28 | 140 | $87.68 | 20 |
| Montelukast Sodium | Montelukast Sodium | 28 | 2,080 | $214.75 | — |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 26 | 212 | $188.30 | 18 |
| Ezetimibe | Ezetimibe | 26 | 2,070 | $355.08 | 13 |
| Clopidogrel | Clopidogrel Bisulfate | 25 | 2,440 | $264.75 | — |
| Finasteride | Finasteride | 24 | 1,830 | $262.07 | — |
| Fenofibrate | Fenofibrate Nanocrystallized | 24 | 2,150 | $891.98 | — |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 23 | 450 | $140.48 | 19 |
| Paxlovid | Nirmatrelvir/Ritonavir | 23 | 115 | $2,858.80 | 22 |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 22 | 154 | $124.07 | 16 |
(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 PECOSSources: 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.
Physical Therapist
PHYSICALTHERAPIST
Dentist - General Practice
Doctor of Dental Surgery
Dentist
Doctor of Dental Medicine
Dentist - Periodontics
Doctor of Dental Surgery
Internal Medicine
Doctor of Medicine (M.D.)
Chiropractor
Career & Practice History
NPI enumerated January 21, 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 Irvine
- Dr. Niroshan Kirupananthan, MD
- Dr. Karen Sun, MD
- Dr. Tung Ngo, DO
- Sara Sabeti
- Dr. Sara Kim, MD
- Dr. Terese Bergheim, MD
Mailing Address
113 Waterworks Way, #125
Irvine, CA 926183168
Phone: 9495526788