Maria C. Diaz, M.D.
Specialist · Baltimore, MD
Maria C. Diaz, M.D. is a specialist with a practice address in Baltimore, Maryland, and NPI 1437127966, issued on Mar 10, 2006. Check the license (Maryland D30153, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Maria C. Diaz
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- D30153 MD
Self-reported in NPPES; status is on the state search - Practice location
- 6 Volz Ave, Baltimore, MD 21220
- Phone
- (410) 687-2118
- Enumerated
- Mar 10, 2006
- Record last updated
- Jul 2, 2010 (not updated in 16 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest specialist records → All 938 in Maryland → Look up another NPI →
Verify Maria C. Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license D30153Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average specialist in 2024
218 Medicare Part D claims, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Escitalopram Oxalate18 claims
- Carvedilol15 claims
- Omeprazole15 claims
- Autoshield Duo Pen Needle14 claims
- Losartan Potassium13 claims
- Olanzapine13 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.
Maria C. Diaz among 938 specialist records in Maryland
Maria C. Diaz, M.D. is one of 938 specialist records with a practice address in Maryland. 36% 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 17% of them.
- NPI issued2006 · 17% of these records are older, 39% newer
- In a Medicare fileYes · 36% of these records are
- In the CMS Doctors and Clinicians fileNo · 23% of these records are
- Record last updated2010 · 72% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in Maryland
There are 938 specialist records in Maryland.
All 938 in Maryland → Every provider in Baltimore → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Yvonne JacksonMiddle River, MD 212201245183714
- Miguel Reyes, PH.D.Baltimore, MD 212201144645862
- Andrea Amrhein, CMTBaltimore, MD 212211871718239
- Edward SibelBaltimore, MD 212211356313886
- Edward Cohen, M.D.Baltimore, MD 212181497748925
- June Compton, CRNPBaltimore, MD 212181265525364
- Satpal DangBaltimore, MD 212221477524262
- Gary Pushkin, M.D.Baltimore, MD 212181871587212
Common questions
What is Maria C. Diaz, M.D.'s NPI number?
Maria C. Diaz, M.D.'s National Provider Identifier (NPI) is 1437127966, issued on Mar 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Maria C. Diaz, M.D. located?
The NPPES record lists a practice address at 6 Volz Ave, Baltimore, MD, 21220. Phone: (410) 687-2118. Providers update this record themselves, so call before visiting.
How can I verify Maria C. Diaz, M.D.'s license?
NPPES lists Maryland license number D30153, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
How much does Maria C. Diaz, M.D. prescribe under Medicare Part D?
In 2024, Maria C. Diaz, M.D. had 218 Medicare Part D claims; the average among specialist prescribers was 1,380. 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.