Frederick Fleszler, MD
NPI 1588758353 · Nephrology Physician · Allentown, PA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Frederick Fleszler, MD is a Nephrology Physician provider in Allentown, PA (NPI 1588758353).
Provider details
- NPI number
- 1588758353
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 25MA08358900 (NJ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
1,329 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 418 | $74 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 161 | $97 |
| Home Dialysis Services Per Month (20 Years Or Older)90966 | 152 | $277 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 147 | $16 |
| Hemodialysis Procedure With Physician Evaluation90935 | 119 | $67 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 187 | 53 |
| Calcitriol | 150 | 40 |
| Lisinopril | 123 | 31 |
| Losartan Potassium | 114 | 40 |
| Valsartan | 73 | 20 |
| Spironolactone | 67 | 16 |
| Doxazosin Mesylate | 60 | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-03
- Last updated
- 2022-05-31
- Certified
- 2022-05-31
Frequently asked questions
- What is Frederick Fleszler's NPI number?
- Frederick Fleszler's National Provider Identifier (NPI) is 1588758353, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frederick Fleszler's specialty?
- Frederick Fleszler is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Frederick Fleszler located?
- Frederick Fleszler's practice location on file with NPPES is 1230 S Cedar Crest Blvd Stes 301, 302, 304, Allentown, PA 18103-6212.
- What is Frederick Fleszler's phone number?
- The practice phone number listed in the NPPES registry for Frederick Fleszler is (610) 432-4529.
- Does Frederick Fleszler accept Medicare?
- Frederick Fleszler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Frederick Fleszler's NPI active?
- Yes — Frederick Fleszler's NPI (1588758353) is active in the NPPES registry as of the last update on 2022-05-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.