Thomas A. Neef, M.D.
Internal Medicine Physician · Wilmington, DE
Thomas A. Neef, M.D. is an internal medicine physician with a practice address in Wilmington, Delaware, and NPI 1568550309, issued on Oct 10, 2006. Check the license (Delaware C1-1941, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Thomas A. Neef
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C1-1941 DE
Self-reported in NPPES; status is on the state search - Practice location
- 1301 Milltown RD, Wilmington, DE 19808
- Phone
- (302) 994-8474
- Enumerated
- Oct 10, 2006
- Record last updated
- Feb 24, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (302) 995-9524
- Medicare enrollment
- Enrolled (PECOS I20100622000013); accepts Medicare assignment
- Medical or professional school
- Georgetown University School Of Medicine, 1975
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 600 in Delaware → Look up another NPI →
Verify Thomas A. Neef 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 C1-1941Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% more Medicare Part D claims than the average internal medicine physician in 2024
5,408 Medicare Part D claims for 303 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 312 claims were for opioids.
Most prescribed
- Atorvastatin Calcium376 claims
- Losartan Potassium307 claims
- Amlodipine Besylate294 claims
- Hydrochlorothiazide255 claims
- Levothyroxine Sodium154 claims
- Alprazolam146 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.
Thomas A. Neef among 600 internal medicine physician records in Delaware
Thomas A. Neef, 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 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 68% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1975 · median 2008 among the 414 with a school on file
- Record last updated2012 · 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
- Mart Amick, MDWilmington, DE 198081942209143
- Franklin Ampadu, M.D.Wilmington, DE 198081245236843
- James Damour, M.D.Wilmington, DE 198081700884061
- Stuart Felzer, MDWilmington, DE 198081508804402
- Robert Kopecki, DOWilmington, DE 198081326047796
- David Maged, MDWilmington, DE 198081124028808
- Victoria Mawn, MDWilmington, DE 198081932108305
- Andrew Myers, MDWilmington, DE 198081477566446
Common questions
What is Thomas A. Neef, M.D.'s NPI number?
Thomas A. Neef, M.D.'s National Provider Identifier (NPI) is 1568550309, issued on Oct 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas A. Neef, M.D. located?
The NPPES record lists a practice address at 1301 Milltown RD, Wilmington, DE, 19808. Phone: (302) 994-8474. Providers update this record themselves, so call before visiting.
How can I verify Thomas A. Neef, M.D.'s license?
NPPES lists Delaware license number C1-1941, 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 Thomas A. Neef, M.D. prescribe under Medicare Part D?
In 2024, Thomas A. Neef, M.D. had 5,408 Medicare Part D claims for 303 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.