Karl Zimmerman, MD
NPI 1154439966 · Internal Medicine Physician · Kennett Square, PA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karl Zimmerman, MD is a Internal Medicine Physician provider in Kennett Square, PA (NPI 1154439966).
Provider details
- NPI number
- 1154439966
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD056655L (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
3,600 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,159 | $132 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 418 | $19 |
| Urinalysis, Manual Test81002 | 407 | $3 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 350 | $94 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 248 | $134 |
| Administration of Influenza Virus VaccineG0008 | 239 | $33 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 120 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 732 | 212 |
| Amlodipine Besylate | 475 | 134 |
| Levothyroxine Sodium | 413 | 116 |
| Losartan Potassium | 287 | 98 |
| Atorvastatin Calcium | 257 | 73 |
| Metoprolol Succinate | 222 | 72 |
| Lisinopril |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$90 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-29
- Last updated
- 2015-07-10
Frequently asked questions
- What is Karl Zimmerman's NPI number?
- Karl Zimmerman's National Provider Identifier (NPI) is 1154439966, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karl Zimmerman's specialty?
- Karl Zimmerman is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karl Zimmerman located?
- Karl Zimmerman's practice location on file with NPPES is 127 W Street Rd, Kennett Square, PA 19348-1698.
- What is Karl Zimmerman's phone number?
- The practice phone number listed in the NPPES registry for Karl Zimmerman is (610) 444-1212.
- Does Karl Zimmerman accept Medicare?
- Karl Zimmerman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karl Zimmerman's NPI active?
- Yes — Karl Zimmerman's NPI (1154439966) is active in the NPPES registry as of the last update on 2015-07-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.