Quick answers
- Does Karen S. Greve accept Medicare assignment?
- Yes. Medicare's clinician data says Karen S. Greve 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 Karen S. Greve see?
- In 2024, CMS data shows 128 Original Medicare patients and 137 services for Karen S. Greve. This counts Original Medicare only and measures volume, not quality.
- What is Karen S. Greve's NPI number?
- 1427018431. 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 Karen S. Greve, 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 | 128 |
|---|---|
| Services billed to Medicare | 137 |
| Different services or procedures | 40 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)15 services
- Anesthesia for other procedure on large bowel using an endoscope (00811)14 services
- Anesthesia for other procedure on upper abdomen (00790)12 services
- Anesthesia for procedure on small and large bowel using an endoscope (00813)12 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%
- Chronic kidney disease37%
- Diabetes34%
- Ischemic heart disease31%
Hospitals where Karen S. Greve works
Medicare's Facility Affiliation Data lists Karen S. Greve 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.
- Institute for Orthopaedic SurgeryLima, OH · Acute Care Hospital · Emergency services: not listed by Medicare · CCN 360263
- Upper Valley Medical CenterTroy, OH · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 360174
Practice locations
Addresses where Karen S. Greve is enrolled with Medicare (CMS data updated October 2, 2026).
- 3130 N Country Rd, 25aTroy, OH 45373 (937) 440‑4000
- 801 Medical Dr, Suite BLima, OH 45804 (419) 224‑7586
Group practices
Medicare enrollment lists Karen S. Greve as a member of these groups (CMS data updated October 2, 2026).
- PHS Anesthesia Billing, LLC249 clinicians in the group
- Buckeye Anesthesia Services and Consultants LLC17 clinicians in the group
Specialties
Find other clinicians: Certified Registered Nurse Anesthetist (CRNA), Ohio →
Other nurse anesthetists in Troy
Clinicians with the same Medicare primary specialty in Troy, OH — not a recommendation.
Other clinicians in PHS Anesthesia Billing, LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CNA |
|---|---|
| School | University Of Cincinnati College Of Medicine |
| Graduation year | 2002 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1427018431 |
| 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