Stephen Kwan, M.D.
NPI 1518052356 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Marshfield, WI
Enrolled with Medicare as Practitioner - Thoracic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Kwan, M.D. is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider in Marshfield, WI (NPI 1518052356).
Provider details
- NPI number
- 1518052356
- Entity type
- Individual
- Primary specialty
- Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 101680 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
153 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) |
|---|---|---|
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 37 | $115 |
| Coronary Artery Bypass Using Artery Graft, 1 Graft33533 | 34 | $1,349 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 29 | $72 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 24 | $118 |
| Coronary Artery Bypass Using Vein Or Artery Graft, 2 Grafts33518 | 15 | $334 |
| Replacement of Aortic Valve Through the Skin and Femoral Artery33361 | 14 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Potassium Chloride | 36 | 21 |
| Furosemide | 29 | 19 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 24 | 11 |
| Amiodarone Hcl | 22 | 15 |
| Metoprolol Succinate | 21 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 12 | 11 |
| Atorvastatin Calcium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$15 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
Additional practice locations (1)
- 1758 Park PlSuite 202Montgomery, AL 36106-1127Phone: (334) 264-7156Fax: (334) 264-7681
Registry dates
- Enumerated
- 2006-10-04
- Last updated
- 2024-05-21
- Certified
- 2024-05-13
Frequently asked questions
- What is Stephen Kwan's NPI number?
- Stephen Kwan's National Provider Identifier (NPI) is 1518052356, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Kwan's specialty?
- Stephen Kwan is listed in the NPPES registry with a primary specialty of Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Kwan located?
- Stephen Kwan's practice location on file with NPPES is 1000 N Oak Ave, Marshfield, WI 54449-5703.
- What is Stephen Kwan's phone number?
- The practice phone number listed in the NPPES registry for Stephen Kwan is (715) 387-5511.
- Does Stephen Kwan accept Medicare?
- Stephen Kwan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Kwan's NPI active?
- Yes — Stephen Kwan's NPI (1518052356) is active in the NPPES registry as of the last update on 2024-05-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.