Quick answers
- Does Karen E. Warschaw accept Medicare assignment?
- Yes. Medicare's clinician data says Karen E. Warschaw 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 E. Warschaw see?
- In 2024, CMS data shows 4,666 Original Medicare patients and 9,401 services for Karen E. Warschaw. This counts Original Medicare only and measures volume, not quality.
- What is Karen E. Warschaw's NPI number?
- 1538142625. 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 E. Warschaw, 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 | 4,666 |
|---|---|
| Services billed to Medicare | 9,401 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Pathology examination of tissue using a microscope, intermediate complexity (88305)7,726 services
- Special stained specimen slides to examine tissue, initial procedure (88342)671 services
- Special stained specimen slides to examine tissue, each additional procedure (88341)521 services
- Special stained specimen slides to identify organisms including interpretation and report (88312)162 services
- Pathology examination of tissue using a microscope, moderately low complexity (88304)132 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 pressure70%
- Arthritis45%
- Ischemic heart disease29%
- Chronic kidney disease26%
- Diabetes20%
Practice locations
Addresses where Karen E. Warschaw is enrolled with Medicare (CMS data updated October 2, 2026).
- 9060 E Via Linda, Suite 115Scottsdale, AZ 85258 (480) 275‑2494
Group practices
Medicare enrollment lists Karen E. Warschaw as a member of this group (CMS data updated October 2, 2026).
- Richard Bernert LLC7 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in Scottsdale
Clinicians with the same Medicare primary specialty in Scottsdale, AZ — not a recommendation.
Other clinicians in Richard Bernert LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Minnesota Medical School |
| Graduation year | 1985 (41 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538142625 |
| 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