Dr. Stephen Yoon, MD
- Medicare services, 2024
- 663
- Medicare patients, 2024
- 256
- Part D claims, 2024
- 502
- Hospital affiliations
- 2
- Industry payments
- $1,967
- Practice address
- 101 E. Valencia Mesa Drive, Fullerton, CA 92835
- Practice phone
- Call (714) 578-8706
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
St. Jude Medical Center - Unit
Acute Care Hospital-Unit · Fullerton, California
Find Dr. Yoon's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Stephen Yoon is an internist in Fullerton, California
Dr. Yoon practices at St. Jude Medical Center - Unit in Fullerton, California.
Dr. Yoon's NPI, 1851327100, was assigned on June 25, 2006. Dr. Yoon graduated from Rutgers New Jersey Medical School in 1998. Dr. Yoon holds California license A71645.
- NPI
- 1851327100NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3971690942
- NPI enumeration date
- June 25, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (714) 578-8706
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Stephen Yoon practices at St. Jude Medical Center - Unit in Fullerton, California
Dr. Yoon's primary practice is St. Jude Medical Center - Unit, at 101 E. Valencia Mesa Drive, Fullerton, CA 92835 in Orange County. The practice phone is (714) 578-8706.
- St. Jude Medical Center - Unit101 E. Valencia Mesa Drive, Fullerton, CA 92835 · Orange CountyPhone(714) 578-8706
Source: Dmand AI Affiliation Data
Dr. Stephen Yoon is affiliated with 2 sites of care and 1 medical group
Dr. Yoon's primary practice is St. Jude Medical Center - Unit in Fullerton, California. Dr. Yoon is also affiliated with Providence St. Jude Medical Center. The medical group on file is St. Jude Heritage Medical Group.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Stephen Yoon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Yoon practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Jude Medical Center - Unit | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Stephen Yoon is one of 16,751 internists in California
Internal medicine is Dr. Yoon's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Yoon is board certified in hospice and palliative medicine by the American Board of Internal Medicine. Dr. Yoon is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acute diabetes, acute respiratory failure, bile duct problems, cardiac arrhythmia, cellulitis, circulation problems, congestive heart failure and electrolyte disorders among the conditions Dr. Yoon treats.
Internists near Dr. Yoon
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Stephen Yoon billed Medicare for 663 services in 2024
CMS data shows 663 Medicare services from Dr. Yoon across 6 procedure codes in 2024, for 256 Medicare patients. Medicare paid $54,286 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Yoon's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 8102024: 66318%
Dr. Yoon compared with the California median for internists, 2024
- Dr. Yoon
- California median
- Medicare services
- 663vs 36184% above
- Medicare patients
- 256vs 15170% above
- Part D claims
- 260vs 42138% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Yoon's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Yoon?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Yoon and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stephen Yoon treated 256 Medicare patients in 2024, average age 79
CMS counts 256 Medicare patients who saw Dr. Yoon in 2024. The largest group is 75 to 84, with 109 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 39% are also on Medicaid. Their average risk score is 2.64, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Yoon's median patient age at 72, with 47% women.
Dr. Yoon's Medicare patients by age, 2024
Dr. Yoon's Medicare patients by sex, 2024
- Women13653%
- Men12047%
Chronic conditions among Dr. Yoon's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Chronic kidney disease52%
- Diabetes52%
- Heart failure48%
- Ischemic heart disease47%
- Atrial fibrillation41%
Share of Medicare patients with each condition. A patient can have several.
Dr. Yoon's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women47%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Stephen Yoon wrote 502 Medicare Part D claims in 2024
In 2024, Dr. Yoon wrote 502 Medicare Part D claims for 186 patients. 86% of them were for generic drugs. CMS names the drug for 260 of them, across 13 drugs with 11 or more claims each, at $12,621 in total drug cost. In 2023, CMS named 261 claims across 11 drugs.
Dr. Yoon's Part D claims by kind of drug, 2024
- Generic430 claims86%
- Brand-name and other72 claims14%
Dr. Yoon's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Yoon's Part D claims, 2024
- Opioids4%18 of 502 claims
- Antibiotics19%95 of 502 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2612024: 260No change
Drugs named by CMS: 13 in 2024, 11 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Stephen Yoon takes part in Medicare
Dr. Yoon accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Stephen Yoon received $1,967 in industry payments from 2016 to 2025
CMS Open Payments shows 68 general payments to Dr. Yoon from 15 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $712.
General payments to Dr. Yoon by program year, 2016 to 2025
Companies that paid Dr. Yoon the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Stephen Yoon graduated from Rutgers New Jersey Medical School
Dr. Yoon graduated from Rutgers New Jersey Medical School in 1998.
- Medical school
- Board certified in hospice and palliative medicine
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Stephen Yoon accepts plans from 14 insurance carriers
Dr. Yoon is in network with 14 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- Alliant Health Plans
- +6 more carriersWith a free account
Plan types Dr. Yoon accepts, by number of carriers
- Medicare9
- PPO9
- HMO6
- EPO4
- POS4
Source: Dmand AI Insurance Network Data
Sources for Dr. Stephen Yoon's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Stephen Yoon
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Stephen Yoon's NPI number?
Dr. Stephen Yoon's NPI number is 1851327100. It was assigned on June 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Stephen Yoon?
Dr. Stephen Yoon is an internist in Fullerton, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Stephen Yoon practice?
Dr. Yoon practices at 101 E. Valencia Mesa Drive, Fullerton, CA 92835. Dr. Yoon's primary practice is St. Jude Medical Center - Unit in Fullerton, California.
What is Dr. Stephen Yoon's office phone number?
The practice phone on file for Dr. Yoon is (714) 578-8706.
What is Dr. Stephen Yoon's medical license number?
Dr. Yoon holds California license A71645.
Which hospitals is Dr. Stephen Yoon affiliated with?
Dr. Yoon is affiliated with Providence St. Jude Medical Center. Dmand AI links Dr. Yoon to 1 more hospital.
What medical group is Dr. Stephen Yoon part of?
Dr. Yoon is linked to St. Jude Heritage Medical Group.
Does Dr. Stephen Yoon accept Medicare?
Yes. CMS data shows Dr. Yoon billed Medicare for 663 services in 2024, and Dr. Yoon accepts Medicare assignment.
How many Medicare patients does Dr. Stephen Yoon see?
CMS counts 256 Medicare patients who saw Dr. Yoon in 2024, with an average age of 79.
Is Dr. Stephen Yoon board certified?
Yes. Dr. Yoon is board certified in hospice and palliative medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Stephen Yoon bill to Medicare?
In 2024, Dr. Yoon's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).
Where did Dr. Stephen Yoon go to medical school?
Dr. Yoon graduated from Rutgers New Jersey Medical School in 1998.
What drugs does Dr. Stephen Yoon prescribe most?
In 2024 Medicare Part D data, Dr. Yoon's most prescribed drugs by claims were Amoxicillin-Clavulanate Potass, Furosemide and Pantoprazole Sodium.
Has Dr. Stephen Yoon received payments from drug or device companies?
CMS Open Payments shows $1,967 in general payments to Dr. Yoon from 15 companies from 2016 to 2025. The largest total came from Pfizer Inc.
How long has Dr. Stephen Yoon been practicing?
Dr. Yoon graduated from medical school in 1998, 28 years ago.
What insurance does Dr. Stephen Yoon accept?
Dr. Yoon is in network with 14 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
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