Quick answers
- Does Garry Jean Louis accept Medicare assignment?
- Yes. Medicare's clinician data says Garry Jean Louis accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Garry Jean Louis see?
- In 2024, CMS data shows 484 Original Medicare patients and 85,982 services for Garry Jean Louis. This counts Original Medicare only and measures volume, not quality.
- What is Garry Jean Louis's NPI number?
- 1538106828. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Garry Jean Louis, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 484 |
|---|---|
| Services billed to Medicare | 85,982 |
| Different services or procedures | 101 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Injection, infliximab-abda, biosimilar, (renflexis), 10 mg (Q5104)2,950 services
- Bcg live intravesical instillation, 1 mg (J9030)1,200 services
- Injection, ceftriaxone sodium, per 250 mg (J0696)856 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)285 services
- Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less (96365)270 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol74%
- High blood pressure73%
- Arthritis44%
- Diabetes35%
- Chronic kidney disease33%
- Ischemic heart disease29%
Hospitals where Garry Jean Louis works
Medicare's Facility Affiliation Data lists Garry Jean Louis at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Columbus Community HospitalColumbus, WI · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 521338
- SSM Health St Clare Hospital - BarabooBaraboo, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520057
- SSM Health St Mary's Hospital - JanesvilleJanesville, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520208
- SSM Health St Mary's Hospital - MadisonMadison, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520083
- Waupun Memorial HospitalWaupun, WI · Critical Access Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 521327
Practice locations
Addresses where Garry Jean Louis is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 18; the Medicare profile lists all.
- 10 Tower DrSun Prairie, WI 53590 (608) 825‑3500
- 1211 Fish Hatchery RdMadison, WI 53715 (608) 252‑8000
- 130 Corporate DrBeaver Dam, WI 53916 (920) 877‑3102
- 1310 BroadwayWisconsin Dells, WI 53965 (608) 253‑1171
- 1515 Park AveColumbus, WI 53925 (920) 623‑2200
Group practices
Medicare enrollment lists Garry Jean Louis as a member of these groups (CMS data updated October 2, 2026).
- Dean Health Systems Inc1,159 clinicians in the group
- Agnesian Healthcare Inc388 clinicians in the group
Specialties
- Infectious Diseaseprimary
- Internal Medicinealso
Other infectious disease doctors in Sun Prairie
Clinicians with the same Medicare primary specialty in Sun Prairie, WI — not a recommendation.
Other clinicians in Dean Health Systems Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1990 (36 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1538106828 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians