Quick answers
- Does Karl A. Zimmerman accept Medicare assignment?
- Yes. Medicare's clinician data says Karl A. Zimmerman 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 Karl A. Zimmerman see?
- In 2024, CMS data shows 610 Original Medicare patients and 4,013 services for Karl A. Zimmerman. This counts Original Medicare only and measures volume, not quality.
- What is Karl A. Zimmerman's NPI number?
- 1154439966. 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 Karl A. Zimmerman, 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 | 610 |
|---|---|
| Services billed to Medicare | 4,013 |
| Different services or procedures | 43 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,159 services
- Annual depression screening, 5 to 15 minutes (G0444)418 services
- Urinalysis, manual test (81002)407 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)350 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)248 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 cholesterol75%
- High blood pressure74%
- Arthritis41%
- Ischemic heart disease36%
- Chronic kidney disease26%
- Diabetes25%
Hospitals where Karl A. Zimmerman works
Medicare's Facility Affiliation Data lists Karl A. Zimmerman 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.
- Chester County HospitalWest Chester, PA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 390179
- Hospital of University of PennsylvaniaPhiladelphia, PA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 390111
- Lancaster General HospitalLancaster, PA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 390100
Practice locations
Addresses where Karl A. Zimmerman is enrolled with Medicare (CMS data updated October 2, 2026).
- 127 W St Rd, Suite 101Kennett Square, PA 19348 (610) 444‑1212
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Kennett Square
Clinicians with the same Medicare primary specialty in Kennett Square, PA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Temple University School Of Medicine |
| Graduation year | 1993 (33 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1154439966 |
| 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