William Wallach
NPI 1720668551 · Hospitalist Physician · Brooklyn, NY
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Wallach is a Hospitalist Physician provider in Brooklyn, NY (NPI 1720668551).
Provider details
- NPI number
- 1720668551
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- 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 tenure38% of score
5 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Duloxetine Hcl | 12 |
| Pantoprazole Sodium | 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
Registry dates
- Enumerated
- 2021-04-14
- Last updated
- 2025-08-20
- Certified
- 2025-08-20
Frequently asked questions
- What is William Wallach's NPI number?
- William Wallach's National Provider Identifier (NPI) is 1720668551, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Wallach's specialty?
- William Wallach is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is William Wallach located?
- William Wallach's practice location on file with NPPES is 506 6th St, Brooklyn, NY 11215-3609.
- What is William Wallach's phone number?
- The practice phone number listed in the NPPES registry for William Wallach is (646) 745-6369.
- Does William Wallach accept Medicare?
- William Wallach is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Wallach's NPI active?
- Yes — William Wallach's NPI (1720668551) is active in the NPPES registry as of the last update on 2025-08-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.