Matthew J. Howenstein, M.D.
Vascular & Interventional Radiology Physician · Grafton, WI
Matthew J. Howenstein, M.D. is a vascular & interventional radiology physician with a practice address in Grafton, Wisconsin, and NPI 1548419336, issued on Sep 16, 2008. Check the license (Wisconsin 61674, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Matthew J. Howenstein
- Credential
- M.D.
- Primary taxonomy
- Vascular & Interventional Radiology Physician 2085R0204X
- License numbers
- 61674 WI
036119267 IL
Self-reported in NPPES; status is on the state search - Practice location
- 975 Port Washington RD, Grafton, WI 53024
- Phone
- (414) 358-5420
- Enumerated
- Sep 16, 2008
- Record last updated
- Aug 10, 2023
- Medicaid ID
- 100035569 WI
- Medicare enrollment
- Enrolled (PECOS I20140320002155); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest vascular & interventional radiology physician records → All 114 in Wisconsin → Look up another NPI →
Also registered at 975 Port Washington RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hamid Afsari, D.O.Hospitalist Physician1053672048
- Muhammed Al-Fawakhiri, MDInternal Medicine Physician1942276613
- Beverly Altman, LMTMassage Therapist1447888789
- Claudia Altmann, MDInfectious Disease Physician1386691756
- Peter Andrew, AAAnesthesiologist Assistant1821704545
- Patrick AndrewsPhysical Therapist1689481962
Verify Matthew J. Howenstein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 61674Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $114.86
1 payment: food and beverage; the largest payer was Boston Scientific Corporation. The 3,457 providers of this specialty with any payment received $7,206.73 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 3 group practices
- Aurora Advanced Healthcare, Inc.Wauwatosa, WI
- Aurora Medical Group, Inc.Milwaukee, WI
- Lakeshore Medical Clinic LLCSt Francis, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Matthew J. Howenstein among 114 vascular & interventional radiology physician records in Wisconsin
Matthew J. Howenstein, M.D. is one of 114 vascular & interventional radiology physician records with a practice address in Wisconsin. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 44% of them.
- NPI issued2008 · 44% of these records are older, 48% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated2005 · median 2009 among the 92 with a school on file
- Record last updated2023 · 33% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0204X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Vascular & Interventional Radiology Physician providers in Wisconsin
There are 114 vascular & interventional radiology physician records in Wisconsin.
All 114 in Wisconsin → Every provider in Grafton → Vascular & Interventional Radiology Physician nationwide →
The 8 vascular & interventional radiology physician records with the nearest ZIP codes
- Jiahao Hu, MDGrafton, WI 530241902260433
- Abdel Aziz Jaffan, M.D.Grafton, WI 530241871799304
- Casey Melcher, M.D.Sheboygan, WI 530811689014417
- Syed Rahman, M.D.Sheboygan, WI 530811376981068
- Nathan Thompson, M.D.Sheboygan, WI 530811780902395
- William Wagner, MDSheboygan, WI 530811063473692
- James Beres, M.D.Mequon, WI 530921265414809
- Emil Hurst, MDMequon, WI 530921891717716
Common questions
What is Matthew J. Howenstein, M.D.'s NPI number?
Matthew J. Howenstein, M.D.'s National Provider Identifier (NPI) is 1548419336, issued on Sep 16, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Matthew J. Howenstein, M.D. located?
The NPPES record lists a practice address at 975 Port Washington RD, Grafton, WI, 53024. Phone: (414) 358-5420. Providers update this record themselves, so call before visiting.
How can I verify Matthew J. Howenstein, M.D.'s license?
NPPES lists Wisconsin license number 61674, 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.
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.