Quick answers
- Does Tammy A. Stewart accept Medicare assignment?
- Yes. Medicare's clinician data says Tammy A. Stewart 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 Tammy A. Stewart see?
- In 2024, CMS data shows 100 Original Medicare patients and 102 services for Tammy A. Stewart. This counts Original Medicare only and measures volume, not quality.
- What is Tammy A. Stewart's NPI number?
- 1114176096. 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 Tammy A. Stewart, 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 | 100 |
|---|---|
| Services billed to Medicare | 102 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Anesthesia for other procedure on large bowel using an endoscope (00811)27 services
- Anesthesia for lens surgery (00142)23 services
- Anesthesia for exam of colon using an endoscope (00812)19 services
- Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)14 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 cholesterol69%
- High blood pressure60%
- Arthritis43%
- Anxiety28%
- Diabetes21%
- Chronic kidney disease20%
Hospitals where Tammy A. Stewart works
Medicare's Facility Affiliation Data lists Tammy A. Stewart 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.
- Eaton Rapids Medical CenterEaton Rapids, MI · Critical Access Hospital · Emergency services: listed by Medicare · CCN 231324
- Edward W Sparrow HospitalLansing, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230230
Practice locations
Addresses where Tammy A. Stewart is enrolled with Medicare (CMS data updated October 2, 2026).
- 1701 S Blvd E, Suite 300Rochester Hills, MI 48307 (248) 844‑9710
- 2909 E Grand River Ave, 201 Smg AnesthesiologyLansing, MI 48912 (517) 253‑3050
- 7276 Huron AveLexington, MI 48450 (512) 593‑1945
Group practices
Medicare enrollment lists Tammy A. Stewart as a member of these groups (CMS data updated October 2, 2026).
- Edward W Sparrow Hospital Association730 clinicians in the group
- Pinnacle Anesthesia PLLC37 clinicians in the group
- Celebrity Anesthesia Staffing LLC23 clinicians in the group
Specialties
Find other clinicians: Certified Registered Nurse Anesthetist (CRNA), Michigan →
Other nurse anesthetists in Rochester Hills
Clinicians with the same Medicare primary specialty in Rochester Hills, MI — not a recommendation.
Other clinicians in Edward W Sparrow Hospital Association
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CNA |
|---|---|
| Graduation year | 2008 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1114176096 |
| 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