Ronald Brandt Mercer, DO MPH
Family Medicine Physician · Wilmington, DE
Ronald Brandt Mercer, DO MPH is a family medicine physician with a practice address in Wilmington, Delaware, and NPI 1770605404, issued on Apr 4, 2007. Check the license (Delaware C20002147, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Ronald Brandt Mercer
- Credential
- DO MPH
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- C20002147 DE
Self-reported in NPPES; status is on the state search - Practice location
- Route 141, Wilmington, DE 19880
- Phone
- (302) 999-2267
- Enumerated
- Apr 4, 2007
- Record last updated
- Sep 11, 2025
- Fax
- (302) 999-3665
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 518 in Delaware → Look up another NPI →
Verify Ronald Brandt Mercer 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 C20002147Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average family medicine physician in 2024
12 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Ronald Brandt Mercer among 518 family medicine physician records in Delaware
Ronald Brandt Mercer, DO MPH 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 2007, is newer than 51% of them.
- NPI issued2007 · 51% of these records are older, 40% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2025 · 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
- Munirah Bomani, MDDover, DE 199011295239861
- Rhea D'SouzaDover, DE 199011861914277
- Angela Debo, D.O.Dover, DE 199011962852368
- John Fink, M.D.Dover, DE 199011275683310
- Nadiene Haynes, MDDover, DE 199011508874793
- Lawrence Lewandowski, MDDover, DE 199011134191422
- Roshan Prabhu, MDDover, DE 199011568899474
- Matthew Reetz, DODover, DE 199011306028048
Common questions
What is Ronald Brandt Mercer, DO MPH's NPI number?
Ronald Brandt Mercer, DO MPH's National Provider Identifier (NPI) is 1770605404, issued on Apr 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Brandt Mercer, DO MPH located?
The NPPES record lists a practice address at Route 141, Wilmington, DE, 19880. Phone: (302) 999-2267. Providers update this record themselves, so call before visiting.
How can I verify Ronald Brandt Mercer, DO MPH's license?
NPPES lists Delaware license number C20002147, 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 Ronald Brandt Mercer, DO MPH prescribe under Medicare Part D?
In 2024, Ronald Brandt Mercer, DO MPH had 12 Medicare Part D claims; 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.