Stephen Yoon
NPI 1508327420 · Ophthalmology Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Yoon is a Ophthalmology Physician provider in Baltimore, MD (NPI 1508327420).
Provider details
- NPI number
- 1508327420
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- D0099007 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
7 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
62 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Problem Focused Exam of Visual System92012 | 39 | $82 |
| Imaging of Optic Nerve92133 | 12 | $35 |
| Established Patient Complete Exam of Visual System92014 | 11 | $129 |
Typical Medicare-allowed amounts for these services range $35–$129 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 30 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 1,062 | 377 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 615 | 227 |
| Brimonidine Tartrate | 450 | 160 |
| Prednisolone Acetate | 290 | 198 |
| Timolol Maleate | 252 | 100 |
| Dorzolamide Hcl | 206 | 73 |
| Ketorolac Tromethamine | 107 | 84 |
| Dorzolamide/Timolol/Pf |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$161 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-03-26
- Last updated
- 2024-09-17
- Certified
- 2024-09-17
Frequently asked questions
- What is Stephen Yoon's NPI number?
- Stephen Yoon's National Provider Identifier (NPI) is 1508327420, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Yoon's specialty?
- Stephen Yoon is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Yoon located?
- Stephen Yoon's practice location on file with NPPES is 22 S Greene St Rm N3e09, Baltimore, MD 21201-1544.
- What is Stephen Yoon's phone number?
- The practice phone number listed in the NPPES registry for Stephen Yoon is (410) 328-6110.
- Does Stephen Yoon accept Medicare?
- Stephen Yoon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Yoon's NPI active?
- Yes — Stephen Yoon's NPI (1508327420) is active in the NPPES registry as of the last update on 2024-09-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.