1. Home
  2. Directory
  3. Wisconsin
  4. Milwaukee
  5. Internal Medicine
  6. NPI Profile

DR. IAN GILSON MD
NPI 1659486744
Internal Medicine in Milwaukee, WI

Active since August 20, 2006PECOS Enrolled
840 N 87TH ST, SARGEANT HEALTH CENTER, MILWAUKEE, WI 53226(414) 805-5540(414) 805-7878 Get Directions Write a Review

NPPES record last updated: March 7, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Ian Gilson Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. IAN GILSON MD (NPI 1659486744) is an individual internal medicine provider in Milwaukee, Wisconsin, licensed in Wisconsin (20996) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1659486744
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. IAN GILSONCredential: MD
Location Address840 N 87TH ST, SARGEANT HEALTH CENTERMilwaukee, WI 53226-3586
Mailing Address840 N 87th St, Sargeant Health CenterMilwaukee, WI 53226-3586 · (414) 805-5540 · Fax (414) 805-7878
Phone(414) 805-5540
Fax(414) 805-7878
Sole ProprietorNo
Enumeration DateAugust 20, 2006
Last NPPES UpdateMarch 7, 2023
✔ NPI 1659486744 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in WI · 20996
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
840 N 87TH ST, Milwaukee, WI 53226
Open in Google Maps ↗

Other Identifiers 1

Medicaid1659486744WI

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ian Gilson Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Ian Gilson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Medical College Of Wisconsin, Inc.
0.3 mi
Internal Medicine
8701 WATERTOWN PLANK RD
Milwaukee, WI 53226
  • Reassigned Medicare billing, Wisconsin enrollment
  • 3,983 clinicians in this Medicare group
NPI 1699720086 (414) 955-7101
Froedtert & the Medical College Of Wisconsin Community Physicians, Inc.
10 mi
Internal Medicine
W180N8000 TOWN HALL RD
Menomonee Falls, WI 53051
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,294 clinicians in this Medicare group
NPI 1568787448 (262) 255-2500

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
199 services103 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
73 services73 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
44 services33 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
34 services30 patients
Influenza vaccine split virus, preservative free 90662
The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.
13 services13 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
13 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53226 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$123.69 typical visit price
range $53.90 – $163.24
Typical copayment $30.92 (range $13.47 – $40.81)
Most-billed visit code 99204
Established Patient
$95.41 typical visit price
range $17.40 – $133.76
Typical copayment $23.85 (range $4.35 – $33.44)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. DAVID WONG MD
Anesthesiology
840 N 87TH ST
MILWAUKEE, WI 53226
Milwaukee County (414) 805-9500
HUMA A ASGHAR MD
Internal Medicine
840 N 87TH ST, SARGEANT HEALTH CENTER
MILWAUKEE, WI 53226
Milwaukee County (414) 805-5440
KRISTEN LYNN BUNNELL PHARMD
Pharmacist
840 N 87TH ST
MILWAUKEE, WI 53226
Milwaukee County (302) 388-8892
MEGAN M CANTWELL PA-C
Physician Assistant
840 N 87TH ST
MILWAUKEE, WI 53226
Milwaukee County (414) 805-5550
DR. KYLE DAVID SMITH D.D.S.
Dentist (Oral and Maxillofacial Surgery)
840 N 87TH ST
MILWAUKEE, WI 53226
Milwaukee County (414) 805-5760
DR. JANE CHINHEE OH DDS
Dentist (General Practice)
840 N 87TH ST, SARGEANT HEALTH CENTER
MILWAUKEE, WI 53226
Milwaukee County (414) 805-5781
ADRIA K BRZENK PA
Physician Assistant (Medical)
840 N 87TH ST
MILWAUKEE, WI 53226
Milwaukee County (414) 805-5540
DR. ROBERT KLINGER GLEESON M.D.
Internal Medicine
840 N 87TH ST, SARGEANT HEALTH CENTER
MILWAUKEE, WI 53226
Milwaukee County (414) 805-5540

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ian Gilson's NPI number?

The NPI number for Ian Gilson is 1659486744. It was assigned to this individual provider in the NPPES registry on August 20, 2006.

Where is Ian Gilson located?

Ian Gilson practices at 840 N 87th St Sargeant Health Center, Milwaukee, WI 53226. The listed phone number is (414) 805-5540.

What is Ian Gilson's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Ian Gilson enrolled in Medicare?

Yes. Ian Gilson is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Ian Gilson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ian Gilson reassigns Medicare benefits to 2 organizations: The Medical College Of Wisconsin, Inc. (Milwaukee, WI) and Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (Menomonee Falls, WI). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ian Gilson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ian Gilson was last updated on March 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.