William L. Horvath, MD
Hematology & Oncology Physician · Sylvania, OH
William L. Horvath, MD is a hematology & oncology physician with a practice address in Sylvania, Ohio, and NPI 1023015351, issued on Jul 1, 2005. Check the license (Ohio 35038120, as entered in NPPES) on the State Medical Board of Ohio; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William L. Horvath
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- 35038120 OH
4301058940 MI
Self-reported in NPPES; status is on the state search - Practice location
- 5308 Harroun RD, Sylvania, OH 43560
- Phone
- (419) 824-6599
- Enumerated
- Jul 1, 2005
- Record last updated
- May 1, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (419) 885-3870
- Medicaid ID
- 0294079 OH
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 513 in Ohio → Look up another NPI →
Also registered at 5308 Harroun RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bonnie Brahaney, CNPNurse Practitioner1396005559
- Kimberly Bruhl, RN, MSN, NP-CHematology & Oncology Physician1609053602
- Terry Gibbs, DOObstetrics & Gynecology Physician1457353237
- A David James, MDInternal Medicine Physician1770585663
- Kenneth Krupp, MDHematology & Oncology Physician1508863747
- Melanie Miller, CNMAdvanced Practice Midwife1154672145
Verify William L. Horvath in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35038120Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William L. Horvath among 513 hematology & oncology physician records in Ohio
William L. Horvath, MD is one of 513 hematology & oncology physician records with a practice address in Ohio. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileNo · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2012 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 hematology & oncology physician records list a practice address in Sylvania
They are 10 of the 881 NPPES records with a practice address in Sylvania, and 513 hematology & oncology physician records in Ohio. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 513 in Ohio → Every provider in Sylvania → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Kimberly Bruhl, RN, MSN, NP-CSylvania, OH 435601609053602
- Feng Jiang, M.D.Sylvania, OH 435601457640807
- Kenneth Krupp, MDSylvania, OH 435601508863747
- Qunfang Li, MDSylvania, OH 435601013395425
- David Macari, M.D.Sylvania, OH 435601992116123
- Jeffrey Muler, MDSylvania, OH 435601285631739
- George Pipoly, MDSylvania, OH 435601689671919
- Abhijit SasteSylvania, OH 435601639361850
Common questions
What is William L. Horvath, MD's NPI number?
William L. Horvath, MD's National Provider Identifier (NPI) is 1023015351, issued on Jul 1, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William L. Horvath, MD located?
The NPPES record lists a practice address at 5308 Harroun RD, Sylvania, OH, 43560. Phone: (419) 824-6599. Providers update this record themselves, so call before visiting.
How can I verify William L. Horvath, MD's license?
NPPES lists Ohio license number 35038120, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.