Quick answers
- Does Casey C. Younkin accept Medicare assignment?
- Yes. Medicare's clinician data says Casey C. Younkin 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 Casey C. Younkin see?
- In 2024, CMS data shows 176 Original Medicare patients and 2,313 services for Casey C. Younkin. This counts Original Medicare only and measures volume, not quality.
- What is Casey C. Younkin's NPI number?
- 1659352656. 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 Casey C. Younkin, 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 | 176 |
|---|---|
| Services billed to Medicare | 2,313 |
| Different services or procedures | 24 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Injection, denosumab, 1 mg (J0897)1,624 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)101 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)44 services
- Injection of drug or substance under skin or into muscle (96372)33 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)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 pressure68%
- High cholesterol67%
- Arthritis41%
- Osteoporosis34%
- Anxiety24%
- Diabetes20%
Hospitals where Casey C. Younkin works
Medicare's Facility Affiliation Data lists Casey C. Younkin 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.
- Abraham Lincoln Memorial HospitalLincoln, IL · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 141322
- Jacksonville Memorial HospitalJacksonville, IL · Critical Access Hospital · Emergency services: listed by Medicare · CCN 141352
- Memorial Medical CenterSpringfield, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140148
- St Francis HospitalLitchfield, IL · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 141350
- St Johns HospitalSpringfield, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140053
Practice locations
Addresses where Casey C. Younkin is enrolled with Medicare (CMS data updated October 2, 2026).
- 1100 E Lincolnshire Blvd, Suite 200Springfield, IL 62703 (217) 545‑8000
- 415 N 9th StSpringfield, IL 62702 (217) 545‑5817
Group practices
Medicare enrollment lists Casey C. Younkin as a member of this group (CMS data updated October 2, 2026).
- SIU Physicians and Surgeons Inc314 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Springfield
Clinicians with the same Medicare primary specialty in Springfield, IL — not a recommendation.
Other clinicians in SIU Physicians and Surgeons Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Washington University School Of Medicine |
| Graduation year | 1983 (43 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659352656 |
| 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