Stephen Paul Yoon
- Medicare services, 2024
- 62
- Medicare patients, 2024
- 75
- Part D claims, 2024
- 4,014
- Hospital affiliations
- 1
- Industry payments
- $1,623
- Practice address
- 1221 Mercantile Lane, Largo, MD 20774
- Practice phone
- Call (301) 300-8733
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ambulatory Surgery Center at Largo Medical Center
Surgery Center - Medicare-Certified · Largo, Maryland
Find Stephen Yoon's professional email, personal email and mobile number
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Stephen Paul Yoon is an ophthalmologist in Upper Marlboro, Maryland
Stephen Yoon practices at Ambulatory Surgery Center at Largo Medical Center in Largo, Maryland.
Stephen Yoon's NPI, 1508327420, was assigned on March 26, 2019. Stephen Yoon graduated from Duke University School of Medicine in 2019. Stephen Yoon holds Maryland license D0099007.
- NPI
- 1508327420NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0042650988
- NPI enumeration date
- March 26, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (301) 300-8733
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Stephen Paul Yoon practices at Ambulatory Surgery Center at Largo Medical Center in Largo, Maryland
Stephen Yoon's primary practice is Ambulatory Surgery Center at Largo Medical Center, at 1221 Mercantile Lane, Largo, MD 20774. The practice phone is (301) 300-8733.
- Ambulatory Surgery Center at Largo Medical Center1221 Mercantile Lane, Largo, MD 20774Phone(301) 300-8733
Source: Dmand AI Affiliation Data
Stephen Paul Yoon is affiliated with 3 sites of care and 1 medical group
Stephen Yoon's primary practice is Ambulatory Surgery Center at Largo Medical Center in Largo, Maryland. Stephen Yoon is also affiliated with University of Maryland Medical Center. The medical group on file is Mid-Atlantic Permanente Medical Group. Dmand AI also links Stephen Yoon to 1 more dialysis center, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Stephen Paul Yoon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Stephen Yoon practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ambulatory Surgery Center at Largo Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Stephen Paul Yoon is one of 471 ophthalmologists in Maryland
Ophthalmology is Stephen Yoon's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Stephen Yoon is licensed in Maryland.
Specialties and state licenses
- Ophthalmology, MarylandPrimary
Ophthalmologists near Stephen Yoon
Counts of ophthalmologists 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
Stephen Paul Yoon billed Medicare for 62 services in 2024
CMS data shows 62 Medicare services from Stephen Yoon across 3 procedure codes in 2024, for 75 Medicare patients. Medicare paid $3,546 for them. Every service was in an office.
Stephen Yoon compared with the Maryland median for ophthalmologists, 2024
- Stephen Yoon
- Maryland median
- Medicare services
- 62vs 1,38896% below
- Medicare patients
- 75vs 62388% below
- Part D claims
- 3,887vs 38010.2 times
Medians across 487 ophthalmologists in Maryland with Dmand AI profiles that report each measure.
Stephen 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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Stephen Paul Yoon treated 75 Medicare patients in 2024, average age 76
CMS counts 75 Medicare patients who saw Stephen Yoon in 2024. The largest group is 75 to 84, with 37 patients. 75% of them have high blood pressure, and 68% have high cholesterol. Their average risk score is 1.04, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Stephen Yoon's median patient age at 68, with 60% women.
Stephen Yoon's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Stephen Yoon's Medicare patients by sex, 2024
- Women4053%
- Men3547%
Chronic conditions among Stephen Yoon's Medicare patients, 2024
- High blood pressure75%
- High cholesterol68%
- Arthritis44%
- Diabetes40%
- Chronic kidney disease29%
- Atrial fibrillation21%
- Ischemic heart disease19%
- Anxiety16%
Share of Medicare patients with each condition. A patient can have several.
Stephen 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 68
Patient panel by sex, all payers
- Women60%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Stephen Paul Yoon wrote 4,014 Medicare Part D claims in 2024
In 2024, Stephen Yoon wrote 4,014 Medicare Part D claims for 1,217 patients. 71% of them were for generic drugs. CMS names the drug for 3,887 of them, across 29 drugs with 11 or more claims each, at $336,486 in total drug cost. In 2023, CMS named 1,128 claims across 17 drugs.
Stephen Yoon's Part D claims by kind of drug, 2024
- Generic2,850 claims71%
- Brand-name1,164 claims29%
Stephen 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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,1282024: 3,887245%
Drugs named by CMS: 29 in 2024, 17 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
Stephen Paul Yoon ranks in the 37th percentile for cataract surgery in Medicare
Stephen Yoon accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 14 procedures of cataract surgery by Stephen Yoon, more than 37% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Stephen Yoon ranks in Medicare procedure volume
- Cataract surgery
- 37th percentile14 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Stephen Paul Yoon received $1,623 in industry payments from 2022 to 2025
CMS Open Payments shows 13 general payments to Stephen Yoon from 3 drug and device companies from 2022 to 2025. Travel and lodging make up the largest share, 57% of the total. Abbvie Inc. paid the most, $1,192.
General payments to Stephen Yoon by program year, 2022 to 2025
General payments to Stephen Yoon by kind, 2022 to 2025
- Travel and lodging$93157%
- Food and beverage$69243%
Companies that paid Stephen Yoon the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Stephen Paul Yoon graduated from Duke University School of Medicine
Stephen Yoon graduated from Duke University School of Medicine in 2019.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Stephen Paul 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)Doctors and Clinicians Utilization Data (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 |
| 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 Stephen Paul 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 Stephen Paul Yoon's NPI number?
Stephen Paul Yoon's NPI number is 1508327420. It was assigned on March 26, 2019, and it is active in the NPI Registry.
What does Stephen Paul Yoon specialize in?
Stephen Paul Yoon is an ophthalmologist in Upper Marlboro, Maryland. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Stephen Paul Yoon practice?
Stephen Yoon practices at 1221 Mercantile Lane, Largo, MD 20774. Stephen Yoon's primary practice is Ambulatory Surgery Center at Largo Medical Center in Largo, Maryland. Dmand AI also links Stephen Yoon to 1 dialysis center.
What is Stephen Paul Yoon's office phone number?
The practice phone on file for Stephen Yoon is (301) 300-8733.
What is Stephen Paul Yoon's medical license number?
Stephen Yoon holds Maryland license D0099007.
Which hospitals is Stephen Paul Yoon affiliated with?
Stephen Yoon is affiliated with University of Maryland Medical Center.
What medical group is Stephen Paul Yoon part of?
Stephen Yoon is linked to Mid-Atlantic Permanente Medical Group.
Does Stephen Paul Yoon accept Medicare?
Yes. CMS data shows Stephen Yoon billed Medicare for 62 services in 2024, and Stephen Yoon accepts Medicare assignment.
How many Medicare patients does Stephen Paul Yoon see?
CMS counts 75 Medicare patients who saw Stephen Yoon in 2024, with an average age of 76.
What services does Stephen Paul Yoon bill to Medicare?
In 2024, Stephen Yoon's most billed Medicare services were eye exam or test (92012), eye exam or test (92133) and eye exam or test (92014).
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Where did Stephen Paul Yoon go to medical school?
Stephen Yoon graduated from Duke University School of Medicine in 2019.
What drugs does Stephen Paul Yoon prescribe most?
In 2024 Medicare Part D data, Stephen Yoon's most prescribed drugs by claims were Latanoprost, Dorzolamide-Timolol and Brimonidine Tartrate.
Has Stephen Paul Yoon received payments from drug or device companies?
CMS Open Payments shows $1,623 in general payments to Stephen Yoon from 3 companies from 2022 to 2025. The largest total came from Abbvie Inc.
How long has Stephen Paul Yoon been practicing?
Stephen Yoon graduated from medical school in 2019, 7 years ago.
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