Quick answers
- Does Karen M. Gremminger accept Medicare assignment?
- Yes. Medicare's clinician data says Karen M. Gremminger 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 M. Gremminger see?
- In 2024, CMS data shows 200 Original Medicare patients and 683 services for Karen M. Gremminger. This counts Original Medicare only and measures volume, not quality.
- What is Karen M. Gremminger's NPI number?
- 1174668404. 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 M. Gremminger, 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 | 200 |
|---|---|
| Services billed to Medicare | 683 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)437 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)110 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)49 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)37 services
- New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)20 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%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)48%
- Arthritis46%
- Diabetes40%
- Ischemic heart disease33%
Hospitals where Karen M. Gremminger works
Medicare's Facility Affiliation Data lists Karen M. Gremminger 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.
- Cobre Valley Regional Medical CenterGlobe, AZ · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 031314
- Mt. Graham Regional Medical CenterSafford, AZ · Critical Access Hospital · Emergency services: listed by Medicare · CCN 031319
- San Carlos Apache Healthcare CorporationPeridot, AZ · Critical Access Hospital · Emergency services: listed by Medicare · CCN 031320
Practice locations
Addresses where Karen M. Gremminger is enrolled with Medicare (CMS data updated October 2, 2026).
- 103 Medicine Way RdPeridot, AZ 85542 (928) 475‑1400
- 5880 S Hospital DrGlobe, AZ 85501 (928) 425‑3261
- P O Box, Suite 787Peridot, AZ 85542
- PO Box, Suite 787Peridot, AZ 85542
Group practices
Medicare enrollment lists Karen M. Gremminger as a member of these groups (CMS data updated October 2, 2026).
- San Carlos Apache Healthcare Corporation148 clinicians in the group
- Cobre Valley Regional Medical Center57 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Arizona
Clinicians with the same Medicare primary specialty in Arizona — not a recommendation.
Other clinicians in San Carlos Apache Healthcare Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Texas Tech University Health Science Center School Of Medicine |
| Graduation year | 1991 (35 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1174668404 |
| 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