Karen Warschaw, M.D.
NPI 1538142625 · Dermatopathology Physician · Scottsdale, AZ
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Warschaw, M.D. is a Dermatopathology Physician provider in Scottsdale, AZ (NPI 1538142625).
Provider details
- NPI number
- 1538142625
- Entity type
- Individual
- Primary specialty
- Dermatopathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 28895 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
9,390 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 7,726 | $70 |
| Special Stained Specimen Slides to Examine Tissue, Initial Procedure88342 | 671 | $103 |
| Special Stained Specimen Slides to Examine Tissue, Each Additional Procedure88341 | 521 | $88 |
| Special Stained Specimen Slides to Identify Organisms Including Interpretation and Report88312 | 162 | $110 |
| Pathology Examination of Tissue Using a Microscope, Moderately Low Complexity88304 | 132 | $42 |
| Antibody Evaluation, Each Additional Single Antibody Stain Procedure88350 | 72 | $111 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-22
- Last updated
- 2015-01-07
Frequently asked questions
- What is Karen Warschaw's NPI number?
- Karen Warschaw's National Provider Identifier (NPI) is 1538142625, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Warschaw's specialty?
- Karen Warschaw is listed in the NPPES registry with a primary specialty of Dermatopathology Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Warschaw located?
- Karen Warschaw's practice location on file with NPPES is 9060 E Via Linda, Scottsdale, AZ 85258-5417.
- What is Karen Warschaw's phone number?
- The practice phone number listed in the NPPES registry for Karen Warschaw is (480) 275-2494.
- Does Karen Warschaw accept Medicare?
- Karen Warschaw is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Warschaw's NPI active?
- Yes — Karen Warschaw's NPI (1538142625) is active in the NPPES registry as of the last update on 2015-01-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.