Timothy Hennessy, M.D.
Internal Medicine Physician · Wilmington, DE
Timothy Hennessy, M.D. is an internal medicine physician with a practice address in Wilmington, Delaware, and NPI 1528045119, issued on Dec 27, 2005. Check the license (Delaware C10005039, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Timothy Hennessy
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C10005039 DE
Self-reported in NPPES; status is on the state search - Practice location
- 3411 Silverside RD, Wilmington, DE 19810
- Phone
- (302) 479-8464
- Enumerated
- Dec 27, 2005
- Record last updated
- Apr 4, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (302) 479-8463
- Medicare enrollment
- Enrolled (PECOS I20080319000317); accepts Medicare assignment
- Medical or professional school
- Jefferson Medical College Of Thomas Jefferson University, 1994
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 600 in Delaware → Look up another NPI →
Also registered at 3411 Silverside RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amanda Anderson, PSY.D.Clinical Psychologist1902591985
- Janet Azran, LCSWClinical Social Worker1194781740
- Abby Bugbee, PSYDClinical Psychologist1588309082
- Holly Catalano, PTPhysical Therapist1033264684
- Robert Catalano, MA,PT,CERT.MDTPhysical Therapist1700931581
- Margaret Conte, MDFamily Medicine Physician1265421028
Verify Timothy Hennessy 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 C10005039Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
24 Medicare Part D claims for 22 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Mupirocin16 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.
Bills Medicare through one group practice
- Christiana Care Health Services IncNewark, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Timothy Hennessy among 600 internal medicine physician records in Delaware
Timothy Hennessy, M.D. is one of 600 internal medicine physician records with a practice address in Delaware. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 92% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1994 · median 2008 among the 414 with a school on file
- Record last updated2008 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
107 internal medicine physician records list a practice address in Wilmington
They are 107 of the 6,291 NPPES records with a practice address in Wilmington, and 600 internal medicine physician records in Delaware.
All 600 in Delaware → Every provider in Wilmington → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Armand Desanctis, MDWilmington, DE 198101558463299
- David Donohue, M.D.Wilmington, DE 198101437112182
- Leslie Donohue, D.O.Wilmington, DE 198101063635589
- M Gilani, MDWilmington, DE 198101780618702
- Sidney Grobman, D.O.Wilmington, DE 198101982920294
- Joseph Loughran, M.D.Wilmington, DE 198101659358232
- James Loughran, M.D.Wilmington, DE 198101932186525
- Alexis Saunders, MDWilmington, DE 198101245818434
Common questions
What is Timothy Hennessy, M.D.'s NPI number?
Timothy Hennessy, M.D.'s National Provider Identifier (NPI) is 1528045119, issued on Dec 27, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Timothy Hennessy, M.D. located?
The NPPES record lists a practice address at 3411 Silverside RD, Wilmington, DE, 19810. Phone: (302) 479-8464. Providers update this record themselves, so call before visiting.
How can I verify Timothy Hennessy, M.D.'s license?
NPPES lists Delaware license number C10005039, 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 Timothy Hennessy, M.D. prescribe under Medicare Part D?
In 2024, Timothy Hennessy, M.D. had 24 Medicare Part D claims for 22 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.