William Zacharias, MD PHD
NPI 1558651380 · Critical Care Medicine (Internal Medicine) Physician · Cincinnati, OH
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Zacharias, MD PHD is a Critical Care Medicine (Internal Medicine) Physician provider in Cincinnati, OH (NPI 1558651380).
Provider details
- NPI number
- 1558651380
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD PHD
- Sex
- Male
- Sole proprietor
- No
- License
- MD452358 (PA)
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
15 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
37 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 37 | $202 |
Typical Medicare-allowed amounts for these services range $202–$202 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 3400 Spruce StPhiladelphia, PA 19104-4238Phone: (215) 662-2200
Registry dates
- Enumerated
- 2011-04-13
- Last updated
- 2022-07-21
Frequently asked questions
- What is William Zacharias's NPI number?
- William Zacharias's National Provider Identifier (NPI) is 1558651380, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Zacharias's specialty?
- William Zacharias is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is William Zacharias located?
- William Zacharias's practice location on file with NPPES is 234 Goodman St, Cincinnati, OH 45219-2364.
- What is William Zacharias's phone number?
- The practice phone number listed in the NPPES registry for William Zacharias is (513) 558-4831.
- Does William Zacharias accept Medicare?
- William Zacharias is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Zacharias's NPI active?
- Yes — William Zacharias's NPI (1558651380) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.