Erik Underhill, M.D.
Internal Medicine Physician · Wilmington, DE
Erik Underhill, M.D. is an internal medicine physician with a practice address in Wilmington, Delaware, and NPI 1881767382, issued on Nov 15, 2006. Check the license (Delaware C1-0006425, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Erik Underhill
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C1-0006425 DE
Self-reported in NPPES; status is on the state search - Practice location
- 1806 N Van Buren Street, Wilmington, DE 19802
- Phone
- (302) 652-3771
- Enumerated
- Nov 15, 2006
- Record last updated
- Apr 4, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (302) 652-3773
- Medicaid ID
- 1000033583 DE
- Medicare enrollment
- Enrolled (PECOS I20080423000440); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 600 in Delaware → Look up another NPI →
Verify Erik Underhill 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 C1-0006425Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,011 Medicare Part D claims for 208 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 15 claims were for opioids.
Most prescribed
- Atorvastatin Calcium269 claims
- Amlodipine Besylate148 claims
- Levothyroxine Sodium129 claims
- Rosuvastatin Calcium99 claims
- Lisinopril53 claims
- Omeprazole49 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
- Value IN Prevention OF Delaware LLCWilmington, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Erik Underhill among 600 internal medicine physician records in Delaware
Erik Underhill, 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
- Graduated1996 · 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
- John Decarli, D.O.Wilmington, DE 198021063404044
- Mikelle Phillips, MDWilmington, DE 198021184686958
- Beenish Ahmed, MDWilmington, DE 198011346636172
- Jessica An, MDWilmington, DE 198011740867035
- Justin Eldridge, M.D.Wilmington, DE 198011295937365
- Neal Emery, MDWilmington, DE 198011316434665
- Christine Gallati, MDWilmington, DE 198011215270665
- Jerry Gluckman, MDWilmington, DE 198031629070370
Common questions
What is Erik Underhill, M.D.'s NPI number?
Erik Underhill, M.D.'s National Provider Identifier (NPI) is 1881767382, issued on Nov 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Erik Underhill, M.D. located?
The NPPES record lists a practice address at 1806 N Van Buren Street, Wilmington, DE, 19802. Phone: (302) 652-3771. Providers update this record themselves, so call before visiting.
How can I verify Erik Underhill, M.D.'s license?
NPPES lists Delaware license number C1-0006425, 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 Erik Underhill, M.D. prescribe under Medicare Part D?
In 2024, Erik Underhill, M.D. had 2,011 Medicare Part D claims for 208 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.