Ian Gilson, MD
Internal Medicine Physician · Milwaukee, WI
Ian Gilson, MD is an internal medicine physician with a practice address in Milwaukee, Wisconsin, and NPI 1659486744, issued on Aug 20, 2006. Check the license (Wisconsin 20996, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Ian Gilson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20996 WI
Self-reported in NPPES; status is on the state search - Practice location
- 840 N 87TH St, Milwaukee, WI 53226
- Phone
- (414) 805-5540
- Enumerated
- Aug 20, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (414) 805-7878
- Medicaid ID
- 1659486744 WI
- Medicare enrollment
- Enrolled (PECOS I20050725000205); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1974
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 840 N 87TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Huma Asghar, MDInternal Medicine Physician1114936721
- Jordan BakerStudent in an Organized Health Care Education/Training Program1891105524
- Hope Benthien, A.P.N.P.Nurse Practitioner1255384293
- Adria Brzenk, PAMedical Physician Assistant1235567512
- Kristen Bunnell, PHARMDPharmacist1124665021
- Megan Cantwell, PA-CPhysician Assistant1134784283
Verify Ian Gilson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 20996Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,778 Medicare Part D claims for 340 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims. 170 claims were for opioids.
Most prescribed
- Atorvastatin Calcium645 claims
- Amlodipine Besylate382 claims
- Lisinopril254 claims
- Rosuvastatin Calcium219 claims
- Losartan Potassium215 claims
- Ezetimibe165 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: $61.90
4 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Froedtert Andthe Medical College OF Wisconsin Community Physicians IncWauwatosa, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ian Gilson among 2,078 internal medicine physician records in Wisconsin
Ian Gilson, MD is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 46% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1974 · median 2002 among the 1,098 with a school on file
- Record last updated2023 · 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 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
382 internal medicine physician records list a practice address in Milwaukee
They are 382 of the 18,389 NPPES records with a practice address in Milwaukee, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Milwaukee → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Gary Barnas, MDMilwaukee, WI 532261902857329
- Karen Fickel, MDMilwaukee, WI 532261336190255
- Kathlyn Fletcher, MDMilwaukee, WI 532261306897236
- Sandra Green, MDMilwaukee, WI 532261871544692
- Tiffany Hubbard, MDWauwatosa, WI 532261518918093
- Samuel Idarraga, M.D.Wauwatosa, WI 532261700850070
- Jasna Jevtic, MDMilwaukee, WI 532261386695823
- Jack Kaufman, MDMilwaukee, WI 532261740231299
Common questions
What is Ian Gilson, MD's NPI number?
Ian Gilson, MD's National Provider Identifier (NPI) is 1659486744, issued on Aug 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ian Gilson, MD located?
The NPPES record lists a practice address at 840 N 87TH St, Milwaukee, WI, 53226. Phone: (414) 805-5540. Providers update this record themselves, so call before visiting.
How can I verify Ian Gilson, MD's license?
NPPES lists Wisconsin license number 20996, 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 Ian Gilson, MD prescribe under Medicare Part D?
In 2024, Ian Gilson, MD had 6,778 Medicare Part D claims for 340 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.