William M. Chasanov, D.O.
Infectious Disease Physician · Lewes, DE
William M. Chasanov, D.O. is an infectious disease physician with a practice address in Lewes, Delaware, and NPI 1104028919, issued on Jun 4, 2007. Check the license (Delaware C7-0003733, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- William M. Chasanov
- Credential
- D.O.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License numbers
- C7-0003733 DE
C7-0003773 DE
25MB09331000 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 1535 Savannah RD, Lewes, DE 19958
- Phone
- (302) 645-3232
- Enumerated
- Jun 4, 2007
- Record last updated
- Feb 9, 2026
- Fax
- (302) 645-3198
- Medicare enrollment
- Enrolled (PECOS I20110323000408); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 2007
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 32 in Delaware → Look up another NPI →
Also registered at 1535 Savannah RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Victor BanzonPulmonary Disease Physician1225073547
- Steven Berlin, MDObstetrics & Gynecology Physician1932104320
- Jimmy Chua, M.D.Infectious Disease Physician1205939840
- Leo Eschbach, DOObstetrics & Gynecology Physician1194720581
- Clare Holmes, MSPASPhysician Assistant1558966614
- Anastasiia Israel, NPNurse Practitioner1104569201
Verify William M. Chasanov in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDelaware Board of Medical Licensure and Discipline
Search for license C7-0003733Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average infectious disease physician in 2024
80 Medicare Part D claims for 17 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 66% of claims.
Most prescribed
- Isentress12 claims
- Triumeq11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $53.25
3 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 3,895 providers of this specialty with any payment received $4,362.19 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Beebe Physician Network Inc.Lewes, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William M. Chasanov among 32 infectious disease physician records in Delaware
William M. Chasanov, D.O. is one of 32 infectious disease physician records with a practice address in Delaware. 91% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 47% of them.
- NPI issued2007 · 47% of these records are older, 44% newer
- In a Medicare fileYes · 91% of these records are
- In the CMS Doctors and Clinicians fileYes · 88% of these records are
- Graduated2007 · median 2002 among the 28 with a school on file
- Record last updated2026 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Delaware
There are 32 infectious disease physician records in Delaware.
All 32 in Delaware → Every provider in Lewes → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Jimmy Chua, M.D.Lewes, DE 199581205939840
- Matthew Jacob, MDLewes, DE 199581689373169
- Ala Muhanna, MDLewes, DE 199581578117545
- Scott Olewiler, M.D.Lewes, DE 199581205881893
- Ambreen Raza, MDMilford, DE 199631326398579
- Rafael Ruiz Gaviria, MDMilford, DE 199631679067334
- Dawn Roach, MDHarrington, DE 199521588226005
- Makondo Shimukowa, MDDelmar, DE 199401730389982
Common questions
What is William M. Chasanov, D.O.'s NPI number?
William M. Chasanov, D.O.'s National Provider Identifier (NPI) is 1104028919, issued on Jun 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William M. Chasanov, D.O. located?
The NPPES record lists a practice address at 1535 Savannah RD, Lewes, DE, 19958. Phone: (302) 645-3232. Providers update this record themselves, so call before visiting.
How can I verify William M. Chasanov, D.O.'s license?
NPPES lists Delaware license number C7-0003733, as entered by the provider. Search the Delaware Board of Medical Licensure and Discipline at https://delpros.delaware.gov/OH_VerifyLicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William M. Chasanov, D.O. prescribe under Medicare Part D?
In 2024, William M. Chasanov, D.O. had 80 Medicare Part D claims for 17 beneficiaries; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. 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.