William Ackley, M.D.
NPI 1225565906 · Nephrology Physician · New Haven, CT
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Ackley, M.D. is a Nephrology Physician provider in New Haven, CT (NPI 1225565906).
Provider details
- NPI number
- 1225565906
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
9 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
986 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Dialysis Services, Per Day, Less Than Full Month Service (20 Years Or Older)90970 | 444 | $10 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 136 | $80 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 92 | $99 |
| 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 | 74 | $17 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 62 | $360 |
| Hemodialysis Procedure With Physician Evaluation |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Torsemide | 76 | 24 |
| Losartan Potassium | 47 | 11 |
| Amlodipine Besylate | 42 | 15 |
| Potassium Citratebrand: Potassium Citrate Er | 42 | 11 |
| Empagliflozinbrand: Jardiance | 40 | — |
| Sevelamer Carbonate | 35 | 12 |
| Chlorthalidone | 33 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$31 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 263 Farmington AveFarmington, CT 06030-8082Phone: (860) 679-4888Fax: (860) 649-1430
Registry dates
- Enumerated
- 2017-05-12
- Last updated
- 2025-06-18
- Certified
- 2025-06-18
Frequently asked questions
- What is William Ackley's NPI number?
- William Ackley's National Provider Identifier (NPI) is 1225565906, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ackley's specialty?
- William Ackley is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is William Ackley located?
- William Ackley's practice location on file with NPPES is 20 York St, New Haven, CT 06510-3220.
- What is William Ackley's phone number?
- The practice phone number listed in the NPPES registry for William Ackley is (203) 688-4242.
- Does William Ackley accept Medicare?
- William Ackley is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Ackley's NPI active?
- Yes — William Ackley's NPI (1225565906) is active in the NPPES registry as of the last update on 2025-06-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.