Alexander Leidner, M.D.
NPI 1174918957 · Nephrology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Leidner, M.D. is a Nephrology Physician provider in Chicago, IL (NPI 1174918957).
Provider details
- NPI number
- 1174918957
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 125 067013 (ID)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
906 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 | 458 | $84 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 90 | $126 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 89 | $134 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 68 | $368 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 63 | $140 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Losartan Potassium | 15 |
| Bumetanide | 13 |
| Amlodipine Besylate | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 240 E Huron StSt #1-200Chicago, IL 60611-2909Phone: (210) 426-7736
Registry dates
- Enumerated
- 2015-03-30
- Last updated
- 2021-07-12
- Certified
- 2021-07-12
Frequently asked questions
- What is Alexander Leidner's NPI number?
- Alexander Leidner's National Provider Identifier (NPI) is 1174918957, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Leidner's specialty?
- Alexander Leidner is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander Leidner located?
- Alexander Leidner's practice location on file with NPPES is 675 N Saint Clair St Ste 18-250, Chicago, IL 60611-5980.
- What is Alexander Leidner's phone number?
- The practice phone number listed in the NPPES registry for Alexander Leidner is (312) 695-0596.
- Does Alexander Leidner accept Medicare?
- Alexander Leidner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Leidner's NPI active?
- Yes — Alexander Leidner's NPI (1174918957) is active in the NPPES registry as of the last update on 2021-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.