Stephen K. Kwan, M.D.
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Marshfield, WI
Stephen K. Kwan, M.D. is a thoracic surgery (cardiothoracic vascular surgery) physician with a practice address in Marshfield, Wisconsin, and NPI 1518052356, issued on Oct 4, 2006. Check the license (Wisconsin 101680, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Stephen K. Kwan
- Credential
- M.D.
- Primary taxonomy
- Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician 208G00000X
- License numbers
- 101680 WI
23435 AL
Self-reported in NPPES; status is on the state search - Practice location
- 1000 N Oak Ave, Marshfield, WI 54449
- Phone
- (715) 387-5511
- Enumerated
- Oct 4, 2006
- Record last updated
- May 21, 2024
- Medicaid ID
- 000096693 AL
- Medicare enrollment
- Enrolled (PECOS I20240509000480); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest thoracic surgery (cardiothoracic vascular surgery) physician records → All 115 in Wisconsin → Look up another NPI →
Also registered at 1000 N Oak Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Raquel Abengozar Mingorance, MDStudent in an Organized Health Care Education/Training Program1609437755
- Aanuoluwa Abiola, M.DGeriatric Medicine (Internal Medicine) Physician1598117574
Verify Stephen K. Kwan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 101680Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average thoracic surgery (cardiothoracic vascular surgery) physician in 2024
234 Medicare Part D claims for 55 beneficiaries, against an average of 101 among the 2,587 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 14 claims were for opioids.
Most prescribed
- Potassium Chloride36 claims
- Furosemide29 claims
- Clopidogrel24 claims
- Amiodarone Hcl22 claims
- Metoprolol Succinate21 claims
- Hydrocodone-Acetaminophen12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 27.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $14.99
1 payment: food and beverage; the largest payer was E.R. Squibb & Sons, L.L.C. The 4,047 providers of this specialty with any payment received $7,828.84 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Mchs Hospitals IncMarshfield, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen K. Kwan among 115 thoracic surgery (cardiothoracic vascular surgery) physician records in Wisconsin
Stephen K. Kwan, M.D. is one of 115 thoracic surgery (cardiothoracic vascular surgery) physician records with a practice address in Wisconsin. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 40% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1987 · median 1993 among the 74 with a school on file
- Record last updated2024 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208G00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers in Wisconsin
There are 115 thoracic surgery (cardiothoracic vascular surgery) physician records in Wisconsin.
All 115 in Wisconsin → Every provider in Marshfield → Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician nationwide →
The 8 thoracic surgery (cardiothoracic vascular surgery) physician records with the nearest ZIP codes
- Thomas Cain, MDMarshfield, WI 544491922011071
- John Douglas Jones, MDMarshfield, WI 544491740380005
- Chris Liakonis, DOMarshfield, WI 544491437117512
- Hope Maki, MDMarshfield, WI 544491326148768
- John Braxton, M.D.Weston, WI 544761073568655
- James Hall, M.D.Weston, WI 544761972693018
- Srinivas Kolla, MDWeston, WI 544761235100397
- Chong Lee, MDWeston, WI 544761497855647
Common questions
What is Stephen K. Kwan, M.D.'s NPI number?
Stephen K. Kwan, M.D.'s National Provider Identifier (NPI) is 1518052356, issued on Oct 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen K. Kwan, M.D. located?
The NPPES record lists a practice address at 1000 N Oak Ave, Marshfield, WI, 54449. Phone: (715) 387-5511. Providers update this record themselves, so call before visiting.
How can I verify Stephen K. Kwan, M.D.'s license?
NPPES lists Wisconsin license number 101680, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen K. Kwan, M.D. prescribe under Medicare Part D?
In 2024, Stephen K. Kwan, M.D. had 234 Medicare Part D claims for 55 beneficiaries; the average among thoracic surgery (cardiothoracic vascular surgery) physician prescribers was 101. Part D covers Medicare prescriptions only.
What is Stephen K. Kwan, M.D.'s MIPS final score?
The 2023 MIPS final score is 27.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.