Matthew Maximilian O'Brien, M.D.
Family Medicine Physician · Wilmington, DE
Matthew Maximilian O'Brien, M.D. is a family medicine physician with a practice address in Wilmington, Delaware, and NPI 1417996935, issued on Jun 6, 2006. Check the license (Delaware C10005808, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Matthew Maximilian O'Brien
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- C10005808 DE
Self-reported in NPPES; status is on the state search - Practice location
- 1401 Foulk RD, Wilmington, DE 19803
- Phone
- (302) 478-5650
- Enumerated
- Jun 6, 2006
- Record last updated
- Jul 24, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (302) 477-0455
- Medicare enrollment
- Enrolled (PECOS I20040227000185); accepts Medicare assignment
- Medical or professional school
- Jefferson Medical College Of Thomas Jefferson University, 1997
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 518 in Delaware → Look up another NPI →
Also registered at 1401 Foulk RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Bercaw, MDFamily Medicine Physician1205814241
- Heather Bittner-Fagan, MDFamily Medicine Physician1013995059
- Mary Lou Galantino, PTPhysical Therapist1689863003
- Michele GouldPhysical Therapist1851322374
- Alyssa Hancock, NPNurse Practitioner1487102646
- Deborah Hoffman, NPAdult Health Nurse Practitioner1043423049
Verify Matthew Maximilian O'Brien 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 C10005808Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% more Medicare Part D claims than the average family medicine physician in 2024
3,574 Medicare Part D claims for 235 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 158 claims were for opioids.
Most prescribed
- Atorvastatin Calcium192 claims
- Levothyroxine Sodium155 claims
- Alprazolam131 claims
- Lisinopril106 claims
- Losartan Potassium90 claims
- Metoprolol Succinate81 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.
Matthew Maximilian O'Brien among 518 family medicine physician records in Delaware
Matthew Maximilian O'Brien, M.D. is one of 518 family medicine physician records with a practice address in Delaware. 80% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 49% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1997 · median 2002 among the 323 with a school on file
- Record last updated2013 · 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 207Q00000X and a Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
163 family medicine physician records list a practice address in Wilmington
They are 163 of the 6,291 NPPES records with a practice address in Wilmington, and 518 family medicine physician records in Delaware.
All 518 in Delaware → Every provider in Wilmington → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- David Bercaw, MDWilmington, DE 198031205814241
- Heather Bittner-Fagan, MDWilmington, DE 198031013995059
- David Estock, M.D.Wilmington, DE 198031275533135
- Lawrence Markman, MDWilmington, DE 198031154313179
- Lisa Maxwell, MDWilmington, DE 198031316978786
- M Metzger, M.D.Wilmington, DE 198031275564957
- James Salva, M.D.Wilmington, DE 198031538104856
- Cathryn Savoca, MDWilmington, DE 198031528033727
Common questions
What is Matthew Maximilian O'Brien, M.D.'s NPI number?
Matthew Maximilian O'Brien, M.D.'s National Provider Identifier (NPI) is 1417996935, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Matthew Maximilian O'Brien, M.D. located?
The NPPES record lists a practice address at 1401 Foulk RD, Wilmington, DE, 19803. Phone: (302) 478-5650. Providers update this record themselves, so call before visiting.
How can I verify Matthew Maximilian O'Brien, M.D.'s license?
NPPES lists Delaware license number C10005808, 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 Matthew Maximilian O'Brien, M.D. prescribe under Medicare Part D?
In 2024, Matthew Maximilian O'Brien, M.D. had 3,574 Medicare Part D claims for 235 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.