William Titley Diaz, MD
Student in an Organized Health Care Education/Training Program · Carolina, PR
William Titley Diaz, MD is a student in an organized health care education/training program with a practice address in Carolina, Puerto Rico, and NPI 1841747144, issued on Sep 2, 2016. Check the license (Puerto Rico 21541, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Titley Diaz
- Credential
- MD
- Primary taxonomy
- Student in an Organized Health Care Education/Training Program 390200000X
- License numbers
- 21541 PR
14929I PR
Self-reported in NPPES; status is on the state search - Practice location
- Hospital Upr Federico Trilla Ave 65 Infanteria, Carolina, PR 00984
- Phone
- (787) 769-4520
- Enumerated
- Sep 2, 2016
- Record last updated
- Jun 10, 2025
- Entity
- Type 1 · individual
Verify William Titley Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Puerto Rico board licenses this profession
Search for license 21541Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
61% fewer Medicare Part D claims than the average student in an organized health care education/training program in 2024
73 Medicare Part D claims for 27 beneficiaries, against an average of 185 among the 59,748 providers of this specialty who prescribed in Part D.
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.
49 student in an organized health care education/training program records list a practice address in Carolina
They are 49 of the 1,535 NPPES records with a practice address in Carolina, and 3,166 student in an organized health care education/training program records in Puerto Rico.
All 49 in Carolina → All 3,166 in Puerto Rico → Every provider in Carolina →
Other student in an organized health care education/training program records in Puerto Rico
- Gretchen AbarcaGuaynabo, PR1730751850
- Soraya Abdul-Hadi MartinezSan Juan, PR1114441607
- Pamella AbreuSan Juan, PR1073242434
- Pedro AbreuAguadilla, PR1336481126
- Bianca Abreu-CarloPonce, PR1558006304
- Alexander AcevedoSan Juan, PR1639972367
- Geovany AcevedoAguadilla, PR1063228385
- Jorge AcevedoCaguas, PR1447959309
- Paola AcevedoPonce, PR1689351157
- Alexandra Acevedo ArroyoToa Alta, PR1467109587
Common questions
What is William Titley Diaz, MD's NPI number?
William Titley Diaz, MD's National Provider Identifier (NPI) is 1841747144, issued on Sep 2, 2016. An NPI identifies a provider in billing; it is not a license.
Where is William Titley Diaz, MD located?
The NPPES record lists a practice address at Hospital Upr Federico Trilla Ave 65 Infanteria, Carolina, PR, 00984. Phone: (787) 769-4520. Providers update this record themselves, so call before visiting.
How can I verify William Titley Diaz, MD's license?
NPPES lists Puerto Rico license number 21541, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does William Titley Diaz, MD prescribe under Medicare Part D?
In 2024, William Titley Diaz, MD had 73 Medicare Part D claims for 27 beneficiaries; the average among student in an organized health care education/training program prescribers was 185. 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.