Dr. Julio J. Diaz, MD
- Medicare patients, 2024
- 18
- Part D claims, 2024
- 160
- Industry payments
- $7,775
- Affiliated sites
- 3
- Medical groups
- 3
- Practice address
- Isaac Gonzalez Martinez Hospital Centro Medico Area, Rio Piedras, PR 00935
- Practice phone
- Call (787) 754-0315
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Grupo Radioterapia Del Norte - Radiology & Imaging - Rio Piedras
Medical specialty practice · Rio Piedras, Puerto Rico
Find Dr. Diaz's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Julio J. Diaz is a radiation oncologist in Caguas, Puerto Rico
Dr. Diaz practices at Grupo Radioterapia Del Norte - Radiology & Imaging - Rio Piedras in Rio Piedras, Puerto Rico.
Dr. Diaz's NPI, 1366459596, was assigned on August 1, 2006. Dr. Diaz holds Puerto Rico license 10907.
- NPI
- 1366459596NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0143235218
- NPI enumeration date
- August 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (787) 754-0315
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Julio J. Diaz practices in Rio Piedras and Caguas
Dr. Diaz's primary practice is Grupo Radioterapia Del Norte - Radiology & Imaging - Rio Piedras, at Isaac Gonzalez Martinez Hospital Centro Medico Area, Rio Piedras, PR 00935. The practice phone is (787) 754-0315. The NPI Registry lists Dr. Diaz's practice address as 2 Cll 25, Caguas, PR 00727.
- Grupo Radioterapia Del Norte - Radiology & Imaging - Rio PiedrasPrimaryIsaac Gonzalez Martinez Hospital Centro Medico Area, Rio Piedras, PR 00935Phone(787) 754-0315
- NPI Registry address2 Cll 25, Caguas, PR 00727 · Caguas CountyPhone(787) 754-0315
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Julio J. Diaz is affiliated with 3 sites of care and 3 medical groups
Dr. Diaz's primary practice is Grupo Radioterapia Del Norte - Radiology & Imaging - Rio Piedras in Rio Piedras, Puerto Rico. The medical group on file is HIMA San Pablo Caguas Hospital. Dmand AI also links Dr. Diaz to 2 more group practices and clinics and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Julio J. Diaz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diaz practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Grupo Radioterapia Del Norte - Radiology & Imaging - Rio Piedras | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Julio J. Diaz is one of 20 radiation oncologists in Puerto Rico
Radiation oncology is Dr. Diaz's primary specialty in the NPI Registry, under taxonomy code 2085R0001X. Dr. Diaz is licensed in Puerto Rico.
Specialties and state licenses
- Radiation oncology, Puerto RicoPrimary
Radiation oncologists near Dr. Diaz
Counts of radiation oncologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Julio J. Diaz treated 18 Medicare patients in 2024, average age 77
CMS counts 18 Medicare patients who saw Dr. Diaz in 2024. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.84, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Chronic conditions among Dr. Diaz's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes61%
Share of Medicare patients with each condition. A patient can have several.
Source: Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Julio J. Diaz wrote 160 Medicare Part D claims in 2024
In 2024, Dr. Diaz wrote 160 Medicare Part D claims for 74 patients. 81% of them were for generic drugs. CMS names the drug for 66 of them, across 3 drugs with 11 or more claims each, at $1,926 in total drug cost. In 2023, CMS named 46 claims across 2 drugs.
Dr. Diaz's Part D claims by kind of drug, 2024
- Generic130 claims81%
- Brand-name and other30 claims19%
Dr. Diaz's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Diaz's Part D claims, 2024
- Opioids16%25 of 160 claims
- Antibiotics8%12 of 160 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 462024: 6643%
Drugs named by CMS: 3 in 2024, 2 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Julio J. Diaz takes part in Medicare
Dr. Diaz accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Julio J. Diaz received $7,775 in industry payments from 2016 to 2025
CMS Open Payments shows 96 general payments to Dr. Diaz from 20 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 54% of the total. Carl Zeiss Meditec USA, Inc. paid the most, $3,090.
General payments to Dr. Diaz by program year, 2016 to 2025
General payments to Dr. Diaz by kind, 2016 to 2025
- Food and beverage$4,17954%
- Travel and lodging$3,07540%
- Education$5217%
Companies that paid Dr. Diaz the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Julio J. Diaz's profile data
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Julio J. Diaz
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What is Dr. Julio J. Diaz's NPI number?
Dr. Julio J. Diaz's NPI number is 1366459596. It was assigned on August 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Julio J. Diaz?
Dr. Julio J. Diaz is a radiation oncologist in Caguas, Puerto Rico. The primary specialty in the NPI Registry is Radiation Oncology Physician (taxonomy code 2085R0001X).
Where does Dr. Julio J. Diaz practice?
Dr. Diaz practices at Isaac Gonzalez Martinez Hospital Centro Medico Area, Rio Piedras, PR 00935. Dr. Diaz also practices at 2 Cll 25, Caguas, PR 00727. Dr. Diaz's primary practice is Grupo Radioterapia Del Norte - Radiology & Imaging - Rio Piedras in Rio Piedras, Puerto Rico. Dmand AI also links Dr. Diaz to 2 group practices and clinics and 2 medical groups.
What is Dr. Julio J. Diaz's office phone number?
The practice phone on file for Dr. Diaz is (787) 754-0315.
What is Dr. Julio J. Diaz's medical license number?
Dr. Diaz holds Puerto Rico license 10907.
What medical group is Dr. Julio J. Diaz part of?
Dr. Diaz is linked to HIMA San Pablo Caguas Hospital. Dmand AI links Dr. Diaz to 2 more medical groups.
Does Dr. Julio J. Diaz accept Medicare?
Yes. CMS lists Dr. Diaz as accepting Medicare assignment.
How many Medicare patients does Dr. Julio J. Diaz see?
CMS counts 18 Medicare patients who saw Dr. Diaz in 2024, with an average age of 77.
What drugs does Dr. Julio J. Diaz prescribe most?
In 2024 Medicare Part D data, Dr. Diaz's most prescribed drugs by claims were Betamethasone Valerate, Dexamethasone and Oxycodone-Acetaminophen.
Has Dr. Julio J. Diaz received payments from drug or device companies?
CMS Open Payments shows $7,775 in general payments to Dr. Diaz from 20 companies from 2016 to 2025. The largest total came from Carl Zeiss Meditec USA, Inc.
How long has Dr. Julio J. Diaz been practicing?
Dr. Diaz's NPI was assigned in 2006.
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