Quick answers
- Does Karen T. Shirrell accept Medicare assignment?
- Yes. Medicare's clinician data says Karen T. Shirrell 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 T. Shirrell see?
- In 2024, CMS data shows 120 Original Medicare patients and 583 services for Karen T. Shirrell. This counts Original Medicare only and measures volume, not quality.
- What is Karen T. Shirrell's NPI number?
- 1922009109. 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 T. Shirrell, 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 | 120 |
|---|---|
| Services billed to Medicare | 583 |
| Different services or procedures | 3 |
| Participating Medicare provider | Yes |
| Average age of these patients | 86 |
Most frequent services
- Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes (99349)390 services
- Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes (99348)160 services
- Residence visit for new patient with moderate level of medical decision making, per day, if using time, at least 60 minutes (99344)33 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 cholesterol69%
- Alzheimer's disease or dementia57%
- Depression50%
- Arthritis46%
- Anxiety38%
Hospitals where Karen T. Shirrell works
Medicare's Facility Affiliation Data lists Karen T. Shirrell 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.
- Ascension St Vincent CarmelCarmel, IN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 150157
Practice locations
Addresses where Karen T. Shirrell is enrolled with Medicare (CMS data updated October 2, 2026).
- 13824 Millstone CtCarmel, IN 46032 (317) 574‑9724
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Carmel
Clinicians with the same Medicare primary specialty in Carmel, IN — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Indiana University School Of Medicine |
| Graduation year | 1979 (47 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922009109 |
| 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