Quick answers
- Does Leo P. Flynn accept Medicare assignment?
- Yes. Medicare's clinician data says Leo P. Flynn 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 Leo P. Flynn see?
- In 2024, CMS data shows 3,804 Original Medicare patients and 11,165 services for Leo P. Flynn. This counts Original Medicare only and measures volume, not quality.
- What is Leo P. Flynn's NPI number?
- 1831149954. 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 Leo P. Flynn, 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 | 3,804 |
|---|---|
| Services billed to Medicare | 11,165 |
| Different services or procedures | 185 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (Q9967)3,528 services
- Injection, gadolinium-based magnetic resonance contrast agent, not otherwise specified (nos), per ml (A9579)830 services
- X-ray of chest, 1 view (71045)789 services
- X-ray of chest, 2 views (71046)622 services
- Piflufolastat f-18, diagnostic, 1 millicurie (A9595)607 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 cholesterol73%
- Arthritis52%
- Diabetes32%
- Ischemic heart disease31%
- Chronic kidney disease26%
Hospitals where Leo P. Flynn works
Medicare's Facility Affiliation Data lists Leo P. Flynn 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.
- Fall River Hospital - CAHHot Springs, SD · Critical Access Hospital · Emergency services: listed by Medicare · CCN 431322
- Monument Health Custer HospitalCuster, SD · Critical Access Hospital · Emergency services: listed by Medicare · CCN 431323
- Monument Health Lead-Deadwood HospitalDeadwood, SD · Critical Access Hospital · Emergency services: listed by Medicare · CCN 431320
- Monument Health Rapid City HospitalRapid City, SD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 430077
- Monument Health Sturgis HospitalSturgis, SD · Critical Access Hospital · Emergency services: listed by Medicare · CCN 431321
Practice locations
Addresses where Leo P. Flynn is enrolled with Medicare (CMS data updated October 2, 2026).
- 2929 5th St, Suite 100Rapid City, SD 57701 (605) 721‑1662
- 3771 Ireland PlRapid City, SD 57702 (605) 430‑7692
Group practices
Medicare enrollment lists Leo P. Flynn as a member of these groups (CMS data updated October 2, 2026).
- Radiology Associates Prof LLC18 clinicians in the group
- The Imaging Center LLC18 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Rapid City
Clinicians with the same Medicare primary specialty in Rapid City, SD — not a recommendation.
Other clinicians in Radiology Associates Prof LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Sanford School Of Medicine Of University Of South Dakota |
| Graduation year | 1998 (28 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831149954 |
| 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