William Horvath, MD
NPI 1023015351 · Hematology & Oncology Physician · Sylvania, OH
William Horvath, MD is a Hematology & Oncology Physician provider in Sylvania, OH (NPI 1023015351).
Provider details
- NPI number
- 1023015351
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 35038120 (OH)
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 tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-01
- Last updated
- 2012-05-01
Frequently asked questions
- What is William Horvath's NPI number?
- William Horvath's National Provider Identifier (NPI) is 1023015351, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Horvath's specialty?
- William Horvath is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is William Horvath located?
- William Horvath's practice location on file with NPPES is 5308 Harroun Rd, Sylvania, OH 43560-2114.
- What is William Horvath's phone number?
- The practice phone number listed in the NPPES registry for William Horvath is (419) 824-6599.
- Is William Horvath's NPI active?
- Yes — William Horvath's NPI (1023015351) is active in the NPPES registry as of the last update on 2012-05-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.