Quick answers
- Does Marie L. Spiess accept Medicare assignment?
- Yes. Medicare's clinician data says Marie L. Spiess 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 Marie L. Spiess see?
- In 2024, CMS data shows 120 Original Medicare patients and 675 services for Marie L. Spiess. This counts Original Medicare only and measures volume, not quality.
- What is Marie L. Spiess's NPI number?
- 1104909753. 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 Marie L. Spiess, 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 | 120 |
|---|---|
| Services billed to Medicare | 675 |
| Different services or procedures | 18 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Strapping, unna boot (29580)208 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)153 services
- Application of vein wound compression bandages on lower leg, ankle, and foot (29581)122 services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)58 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)46 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%
- Arthritis59%
- Diabetes58%
- Chronic kidney disease54%
- Heart failure50%
Hospitals where Marie L. Spiess works
Medicare's Facility Affiliation Data lists Marie L. Spiess 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.
- Memorial HealthcareOwosso, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230121
Practice locations
Addresses where Marie L. Spiess is enrolled with Medicare (CMS data updated October 2, 2026).
- 818 W King StOwosso, MI 48867
- 826 W King StOwosso, MI 48867
Group practices
Medicare enrollment lists Marie L. Spiess as a member of this group (CMS data updated October 2, 2026).
- Memorial Hospital214 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Owosso
Clinicians with the same Medicare primary specialty in Owosso, MI — not a recommendation.
Other clinicians in Memorial Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1999 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104909753 |
| 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