Julio J. Diaz, M.D.
Radiation Oncology Physician · Rio Piedras, PR
Julio J. Diaz, M.D. is a radiation oncology physician with a practice address in Rio Piedras, Puerto Rico, and NPI 1366459596, issued on Aug 1, 2006. Check the license (Puerto Rico 10907, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Julio J. Diaz
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 10907 PR
Self-reported in NPPES; status is on the state search - Practice location
- Isaac Gonzalez Martinez Hospital Centro Medico Area, Rio Piedras, PR 00935
- Phone
- (787) 754-0315
- Enumerated
- Aug 1, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (787) 763-8593
- Medicare enrollment
- Enrolled (PECOS I20090423000264); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 20 in Puerto Rico → Look up another NPI →
Also registered at Isaac Gonzalez Martinez Hospital Centro Medico Area
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Carlos Chevere, M.D.Radiation Oncology Physician1023025285
Verify Julio J. 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 10907Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% more Medicare Part D claims than the average radiation oncology physician in 2024
160 Medicare Part D claims for 74 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. 25 claims were for opioids.
Most prescribed
- Betamethasone Valerate22 claims
- Dexamethasone22 claims
- Oxycodone-Acetaminophen22 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.
Industry payments in 2024: $206.11
7 payments; by number, the most common kind was food and beverage; the largest payer was Pbg Puerto Rico LLC. The 3,275 providers of this specialty with any payment received $1,897.85 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 2 group practices
- Centro DE Cancer DE LA UniversidadSan Juan, PR
- Grupo Radioterapia Del NorteManati, PR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Julio J. Diaz among 20 radiation oncology physician records in Puerto Rico
Julio J. Diaz, M.D. is one of 20 radiation oncology physician records with a practice address in Puerto Rico. 90% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 50% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 75% of these records are
- Graduated1990 · median 1991 among the 15 with a school on file
- Record last updated2007 · 85% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Puerto Rico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Puerto Rico
There are 20 radiation oncology physician records in Puerto Rico.
All 20 in Puerto Rico → Every provider in Rio Piedras → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Carlos Chevere, M.D.Rio Piedras, PR 009351023025285
- Pedro Morales-Hernandez, MDSan Juan, PR 009261508843764
- Betty Gil-Munoz, M.D.San Juan, PR 009211972587293
- Marisol Rodriguez-Hernandez, M.D.San Juan, PR 009211639153679
- Joshua Rodriguez-Lopez, M.D.San Juan, PR 009211114473097
- Benjamin Weinberg, M.D., M.A., FACRSan Juan, PR 009211295052264
- Ruben Cruz Chamorro, MD, MSSan Juan, PR 009191740832062
- Winston Imbert De Iturrondo, MDSan Juan, PR 009181255416301
Common questions
What is Julio J. Diaz, M.D.'s NPI number?
Julio J. Diaz, M.D.'s National Provider Identifier (NPI) is 1366459596, issued on Aug 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Julio J. Diaz, M.D. located?
The NPPES record lists a practice address at Isaac Gonzalez Martinez Hospital Centro Medico Area, Rio Piedras, PR, 00935. Phone: (787) 754-0315. Providers update this record themselves, so call before visiting.
How can I verify Julio J. Diaz, M.D.'s license?
NPPES lists Puerto Rico license number 10907, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does Julio J. Diaz, M.D. prescribe under Medicare Part D?
In 2024, Julio J. Diaz, M.D. had 160 Medicare Part D claims for 74 beneficiaries; the average among radiation oncology physician prescribers was 134. 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.