Cesar Diaz-Marquez, M.D.
Internal Medicine Physician · Milford, DE
Cesar Diaz-Marquez, M.D. is an internal medicine physician with a practice address in Milford, Delaware, and NPI 1699208694, issued on Apr 6, 2017. Check the license (Delaware C1-0025546, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Cesar Diaz-Marquez
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C1-0025546 DE
Self-reported in NPPES; status is on the state search - Practice location
- 100 Wellness Way, Milford, DE 19963
- Phone
- (302) 422-3311
- Enumerated
- Apr 6, 2017
- Record last updated
- Dec 9, 2022
- Medicare enrollment
- Enrolled (PECOS I20230105001038); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 600 in Delaware → Look up another NPI →
Also registered at 100 Wellness Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Argo, PAPhysician Assistant1548154594
- Mohammad Arsalan, M.DHospitalist Physician1063965630
- Emmanuel AsarePharmacist1255113320
- Immad Attique, MDInternal Medicine Physician1780246728
- Anupam Baral, MDInternal Medicine Physician1679102123
- Andrea Bishop, PA-CPhysician Assistant1861048274
Verify Cesar Diaz-Marquez 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 C1-0025546Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
282 Medicare Part D claims for 104 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Amlodipine Besylate15 claims
- Furosemide13 claims
- Prednisone13 claims
- Pantoprazole Sodium11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 78.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $179.78
3 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Apogee Medical Group Delaware IncMilford, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cesar Diaz-Marquez among 600 internal medicine physician records in Delaware
Cesar Diaz-Marquez, 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 2017, is newer than 66% of them.
- NPI issued2017 · 66% of these records are older, 30% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2004 · median 2008 among the 414 with a school on file
- Record last updated2022 · 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).
76 internal medicine physician records list a practice address in Milford
They are 76 of the 713 NPPES records with a practice address in Milford, and 600 internal medicine physician records in Delaware.
All 600 in Delaware → Every provider in Milford → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ben Hur Aguilar, M.D.Milford, DE 199631740475649
- Joseph Deutsch, M.D.Milford, DE 199631568596039
- Martin Golding, M.D.Milford, DE 199631558366633
- Joshua McAfee, M.DMilford, DE 199631972856250
- Adrian Morris, MDMilford, DE 199631447326327
- Robert Rolfes, M.D.Milford, DE 199631306864764
- Muhammad Tahir, MDMilford, DE 199631699146928
- Patrick Titus, M.D.Milford, DE 199631437198033
Common questions
What is Cesar Diaz-Marquez, M.D.'s NPI number?
Cesar Diaz-Marquez, M.D.'s National Provider Identifier (NPI) is 1699208694, issued on Apr 6, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Cesar Diaz-Marquez, M.D. located?
The NPPES record lists a practice address at 100 Wellness Way, Milford, DE, 19963. Phone: (302) 422-3311. Providers update this record themselves, so call before visiting.
How can I verify Cesar Diaz-Marquez, M.D.'s license?
NPPES lists Delaware license number C1-0025546, 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 Cesar Diaz-Marquez, M.D. prescribe under Medicare Part D?
In 2024, Cesar Diaz-Marquez, M.D. had 282 Medicare Part D claims for 104 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Cesar Diaz-Marquez, M.D.'s MIPS final score?
The 2023 MIPS final score is 78.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.