Quick answers
- Does Mary Joy L. Sia Su accept Medicare assignment?
- Yes. Medicare's clinician data says Mary Joy L. Sia Su 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 Mary Joy L. Sia Su see?
- In 2024, CMS data shows 470 Original Medicare patients and 767 services for Mary Joy L. Sia Su. This counts Original Medicare only and measures volume, not quality.
- What is Mary Joy L. Sia Su's NPI number?
- 1356374136. 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 Mary Joy L. Sia Su, 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 | 470 |
|---|---|
| Services billed to Medicare | 767 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)293 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)227 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)88 services
- Hospital discharge day management, more than 30 minutes (99239)58 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)57 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 blood pressure75%
- High cholesterol75%
- Arthritis56%
- Chronic kidney disease51%
- Depression48%
- Anxiety47%
Hospitals where Mary Joy L. Sia Su works
Medicare's Facility Affiliation Data lists Mary Joy L. Sia Su 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.
- Allina United HospitalSaint Paul, MN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 240038
- Alomere HealthAlexandria, MN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 240030
- CentraCare - St. Cloud HospitalSaint Cloud, MN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 240036
- CentraCare Health - MonticelloMonticello, MN · Critical Access Hospital · Emergency services: listed by Medicare · CCN 241362
- Centracare- Rice Memorial HospitalWillmar, MN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 240088
Practice locations
Addresses where Mary Joy L. Sia Su is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 11; the Medicare profile lists all.
- 1013 Hart BlvdMonticello, MN 55362 (763) 295‑2945
- 1021 Bandana Blvd E, Suite 100St Paul, MN 55108 (651) 241‑9700
- 1200 6th Ave NSaint Cloud, MN 56303
- 1200 6th Ave NSt Cloud, MN 56303 (320) 252‑5131
- 1200 6th Ave N, Centracare Clic River CampusSaint Cloud, MN 56303 (320) 252‑5131
Group practices
Medicare enrollment lists Mary Joy L. Sia Su as a member of these groups (CMS data updated October 2, 2026).
- Allina Health System3,842 clinicians in the group
- CentraCare Clinic791 clinicians in the group
- CentraCare Health System-Nr LLC58 clinicians in the group
- CentraCare Health-Paynesville LLC58 clinicians in the group
Specialties
- Internal Medicineprimary
- Hospitalistalso
Other internal medicine doctors in Monticello
Clinicians with the same Medicare primary specialty in Monticello, MN — not a recommendation.
Other clinicians in Allina Health System
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1995 (31 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1356374136 |
| 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