Mark R. Fitzsimmons, MD
Family Medicine Physician · Port Washington, WI
Mark R. Fitzsimmons, MD is a family medicine physician with a practice address in Port Washington, Wisconsin, and NPI 1639284706, issued on Aug 20, 2006. Check the license (Wisconsin 33627, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Mark R. Fitzsimmons
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 33627 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1475 W Grand Ave, Port Washington, WI 53074
- Phone
- (262) 268-5100
- Enumerated
- Aug 20, 2006
- Record last updated
- Nov 18, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (262) 268-5118
- Medicaid ID
- 31986200 WI
- Medicare enrollment
- Enrolled (PECOS I20090908000263); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 1475 W Grand Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Breanne Beres, DPT, ATCPhysical Therapist1396239182
- Cameron Blegen, M.D.Family Medicine Physician1548791585
- Christine Brzakala, APNPNurse Practitioner1891074407
- Bryan CanfieldPhysical Therapist1528002904
- Elizabeth DzwonczykFamily Medicine Physician1427411875
- Christopher Eernisse, D.O..Family Medicine Physician1558742726
Verify Mark R. Fitzsimmons in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 33627Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average family medicine physician in 2024
7,919 Medicare Part D claims for 556 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 45 claims were for opioids.
Most prescribed
- Atorvastatin Calcium811 claims
- Amlodipine Besylate296 claims
- Lisinopril287 claims
- Pantoprazole Sodium284 claims
- Levothyroxine Sodium251 claims
- Rosuvastatin Calcium249 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.
Industry payments in 2024: $124.99
1 payment: food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 55,478 providers of this specialty with any payment received $902.55 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
- Aurora Advanced Healthcare, Inc.Mequon, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark R. Fitzsimmons among 3,765 family medicine physician records in Wisconsin
Mark R. Fitzsimmons, MD is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1991 · median 2007 among the 2,347 with a school on file
- Record last updated2021 · 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 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
13 family medicine physician records list a practice address in Port Washington
They are 13 of the 228 NPPES records with a practice address in Port Washington, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Port Washington → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Cameron Blegen, M.D.Port Washington, WI 530741548791585
- Sara Bodenhamer, D.O.Port Washington, WI 530741639598584
- John Bonavia, MDPort Washington, WI 530741497716880
- Elizabeth DzwonczykPort Washington, WI 530741427411875
- Christopher Eernisse, D.O..Port Washington, WI 530741558742726
- William Hall, M.D.Port Washington, WI 530741992747091
- Anna Kleyman, D.O.Port Washington, WI 530741720303670
- Michael Martella, D.O.Port Washington, WI 530741194849398
Common questions
What is Mark R. Fitzsimmons, MD's NPI number?
Mark R. Fitzsimmons, MD's National Provider Identifier (NPI) is 1639284706, issued on Aug 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark R. Fitzsimmons, MD located?
The NPPES record lists a practice address at 1475 W Grand Ave, Port Washington, WI, 53074. Phone: (262) 268-5100. Providers update this record themselves, so call before visiting.
How can I verify Mark R. Fitzsimmons, MD's license?
NPPES lists Wisconsin license number 33627, 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 Mark R. Fitzsimmons, MD prescribe under Medicare Part D?
In 2024, Mark R. Fitzsimmons, MD had 7,919 Medicare Part D claims for 556 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.