Quick answers
- Does Ariel M. Geffen accept Medicare assignment?
- Yes. Medicare's clinician data says Ariel M. Geffen 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 Ariel M. Geffen see?
- In 2024, CMS data shows 88 Original Medicare patients and 119 services for Ariel M. Geffen. This counts Original Medicare only and measures volume, not quality.
- What is Ariel M. Geffen's NPI number?
- 1588975049. 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 Ariel M. Geffen, 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 | 88 |
|---|---|
| Services billed to Medicare | 119 |
| Different services or procedures | 27 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Anesthesia for other procedure on large bowel using an endoscope (00811)17 services
- Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)15 services
- Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)15 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 pressure64%
- Arthritis61%
- High cholesterol58%
- Osteoporosis22%
- Ischemic heart disease20%
- Depression19%
Hospitals where Ariel M. Geffen works
Medicare's Facility Affiliation Data lists Ariel M. Geffen 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.
- St Luke's Wood River Medical CenterKetchum, ID · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 131323
Practice locations
Addresses where Ariel M. Geffen is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 Hospital DrKetchum, ID 83340
- 100 Hospital Dr, Suite 109Ketchum, ID 83340 (208) 622‑8811
- 191 5th St WKetchum, ID 83340 (208) 725‑2171
Group practices
Medicare enrollment lists Ariel M. Geffen as a member of this group (CMS data updated October 2, 2026).
- St Lukes Clinic - Wood River LLC66 clinicians in the group
Specialties
Find other clinicians: Certified Registered Nurse Anesthetist (CRNA), Idaho →
Other nurse anesthetists in Ketchum
Clinicians with the same Medicare primary specialty in Ketchum, ID — not a recommendation.
Other clinicians in St Lukes Clinic - Wood River LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CNA |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1588975049 |
| 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