Theresa K. Hayssen, MD
Colon & Rectal Surgery Physician · Brookfield, WI
Theresa K. Hayssen, MD is a colon & rectal surgery physician with a practice address in Brookfield, Wisconsin, and NPI 1265412365, issued on Jan 17, 2006. Check the license (Wisconsin 39624, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Theresa K. Hayssen
- Credential
- MD
- Primary taxonomy
- Colon & Rectal Surgery Physician 208C00000X
- License number
- 39624 WI
Self-reported in NPPES; status is on the state search - Practice location
- 17000 W North Ave, Brookfield, WI 53005
- Phone
- (262) 786-3722
- Enumerated
- Jan 17, 2006
- Record last updated
- Feb 10, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (262) 786-0116
- Medicare enrollment
- Enrolled (PECOS I20041230000640); accepts Medicare assignment
- Medical or professional school
- Southern Illinois University School Of Medicine, 1992
- Entity
- Type 1 · individual
8 nearest colon & rectal surgery physician records → All 31 in Wisconsin → Look up another NPI →
Also registered at 17000 W North Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Stephen Bielke, MDInternal Medicine Physician1528035516
- Russell Blankenburg, MDInternal Medicine Physician1104893577
- Barbara Brown, P.T.Physical Therapist1518105949
- James Burhop, MDSurgery Physician1063492593
Verify Theresa K. Hayssen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 39624Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% fewer Medicare Part D claims than the average colon & rectal surgery physician in 2024
131 Medicare Part D claims for 85 beneficiaries, against an average of 192 among the 1,836 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims. 17 claims were for opioids.
Most prescribed
- Sod Sulf-Potass Sulf-Mag Sulf40 claims
- Dicyclomine Hcl12 claims
- Metronidazole12 claims
- Neomycin Sulfate11 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 practice group's MIPS final score for 2023 (Medicare payment program): 82.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $33.81
1 payment: food and beverage; the largest payer was Salix Pharmaceuticals, a division of Bausch Health US, LLC. The 1,524 providers of this specialty with any payment received $3,468.16 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
- Ascension Medical Group-Southeast Wisconsin IncFranklin, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Theresa K. Hayssen among 31 colon & rectal surgery physician records in Wisconsin
Theresa K. Hayssen, MD is one of 31 colon & rectal surgery physician records with a practice address in Wisconsin. 94% 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 0% of them.
- NPI issued2006 · 0% of these records are older, 68% newer
- In a Medicare fileYes · 94% of these records are
- In the CMS Doctors and Clinicians fileYes · 87% of these records are
- Graduated1992 · median 2006 among the 27 with a school on file
- Record last updated2015 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208C00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Colon & Rectal Surgery Physician providers in Wisconsin
There are 31 colon & rectal surgery physician records in Wisconsin.
All 31 in Wisconsin → Every provider in Brookfield → Colon & Rectal Surgery Physician nationwide →
The 8 colon & rectal surgery physician records with the nearest ZIP codes
- Therese Kerwel, MDBrookfield, WI 530051669727921
- Rudolph Kluiber, M.D.Milwaukee, WI 532091508895335
- Jasna Coralic, MDMilwaukee, WI 532111528296753
- Amy Hanna-Salami, M.D.Milwaukee, WI 532151619177870
- James Klas, M.D.Milwaukee, WI 532151467420653
- Molly Meyers, M.D.Milwaukee, WI 532151356636781
- Kate Vasconcellos, MDMilwaukee, WI 532151437477320
- Jed Calata, M.D.Milwaukee, WI 532261972828929
Common questions
What is Theresa K. Hayssen, MD's NPI number?
Theresa K. Hayssen, MD's National Provider Identifier (NPI) is 1265412365, issued on Jan 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Theresa K. Hayssen, MD located?
The NPPES record lists a practice address at 17000 W North Ave, Brookfield, WI, 53005. Phone: (262) 786-3722. Providers update this record themselves, so call before visiting.
How can I verify Theresa K. Hayssen, MD's license?
NPPES lists Wisconsin license number 39624, 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 Theresa K. Hayssen, MD prescribe under Medicare Part D?
In 2024, Theresa K. Hayssen, MD had 131 Medicare Part D claims for 85 beneficiaries; the average among colon & rectal surgery physician prescribers was 192. Part D covers Medicare prescriptions only.
What is Theresa K. Hayssen, MD's MIPS final score?
The 2023 MIPS final score is 82.4 of 100, reported for the practice group. 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.