Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mario Humberto Diaz, MD
Surgery Physician in Annapolis, MD · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1508803693
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Registry record
Entity type Individual (Type 1)
Name Mario Humberto Diaz
Credential MD
Sex Male
Practice address 2001 Medical Pkwy, Acp 4th Floor/Surgical Hospitalist Ste., Annapolis, MD, 21401
Phone (443) 481-1372
Fax (443) 481-1360
Enumeration date May 31, 2006
Last updated in NPPES Sep 17, 2010
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 4071161 | Other | - | AETNA PPO |
| 6718667 | Other | - | AETNA HMO |
| 89468104 | Other | - | CAREFIRST |
| K585007 | Other | - | CAREFIRST |
| 145726104 | Other | - | FEDERAL DEPT OF LABOR (WORKMAN'S COMP) |
| 112414 | Other | - | KAISER PERMANENTE |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Where does Mario Diaz practice?
The practice location on file with NPPES is in Annapolis, MD. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mario Diaz?
The National Provider Identifier (NPI) for Mario Diaz is 1508803693, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Karl Holschuh Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Annapolis, MD NPI 1548269343 Chang Choi Hospitalist Physician · Annapolis, MD NPI 1912907593 Nancy Snow Internal Medicine Physician · Annapolis, MD NPI 1295735975 Suzanne Sullivan Internal Medicine Physician · Annapolis, MD NPI 1992705578 Mohamed Moubarek Internal Medicine Physician · Annapolis, MD NPI 1194725648 Brown, Croft, Frazier, PA Diagnostic Radiology Physician · Annapolis, MD NPI 1902807324 Judy Joseph-Herbert Critical Care Medicine (Internal Medicine) Physician · Annapolis, MD NPI 1356342778 Okeowo Ibitoye Internal Medicine Physician · Annapolis, MD NPI 1154322352
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-09-17.