Quick answers
- Does Karen Zoller accept Medicare assignment?
- Yes. Medicare's clinician data says Karen Zoller 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 Zoller see?
- In 2024, CMS data shows 101 Original Medicare patients and 1,215 services for Karen Zoller. This counts Original Medicare only and measures volume, not quality.
- What is Karen Zoller's NPI number?
- 1508861535. 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 Zoller, 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 | 101 |
|---|---|
| Services billed to Medicare | 1,215 |
| Different services or procedures | 19 |
| 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)179 services
- Dialysis services, 2-3 physician visits per month (20 years or older) (90961)126 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)26 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 cholesterol75%
- Chronic kidney disease75%
- Diabetes56%
- Arthritis46%
- Ischemic heart disease35%
Practice locations
Addresses where Karen Zoller is enrolled with Medicare (CMS data updated October 2, 2026).
- 3780 Kilroy Airport Way, Suite 115Long Beach, CA 90806
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Long Beach
Clinicians with the same Medicare primary specialty in Long Beach, CA — not a recommendation.
Clinician information
| Medical school | University Of California, Geffen School Of Medicine |
|---|---|
| Graduation year | 1977 (49 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1508861535 |
| 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
- 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