Dr. Nicolas Demetrios Prionas, MD, PhD
- Medicare services, 2024
- 999
- Medicare patients, 2024
- 145
- Part D claims, 2024
- 12
- Publications
- 18
- MIPS score, 2024
- 87
- Practice address
- 505 Parnassus Ave, Box 0296, San Francisco, CA 94143
- Practice phone
- Call (415) 353-2733
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Prionas' 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. Nicolas Demetrios Prionas is a radiation oncologist in San Francisco, California
Dr. Prionas practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health.
Dr. Prionas' NPI, 1972840361, was assigned on January 7, 2013. Dr. Prionas graduated from University of California, Davis School of Medicine in 2014. Dr. Prionas holds California license A138608.
- NPI
- 1972840361NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8921339375
- NPI enumeration date
- January 7, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (415) 353-2733
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nicolas Demetrios Prionas practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California
Dr. Prionas' primary practice is UCSF Helen Diller Medical Center at Parnassus Heights, at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143 in San Francisco County. The practice phone is (415) 353-2733.
- UCSF Helen Diller Medical Center at Parnassus Heights505 Parnassus Ave, Box 0296, San Francisco, CA 94143 · San Francisco CountyPhone(415) 353-2733
Source: Dmand AI Affiliation Data
Dr. Nicolas Demetrios Prionas is affiliated with 3 sites of care and 3 medical groups
Dr. Prionas' primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. The medical group on file is UCSF Pediatrics. Dmand AI also links Dr. Prionas to 2 more group practices and clinics and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nicolas Demetrios Prionas' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Prionas practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UCSF Helen Diller Medical Center at Parnassus Heights | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across University of California Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Nicolas Demetrios Prionas is one of 685 radiation oncologists in California
Radiation oncology is Dr. Prionas' primary specialty in the NPI Registry, under taxonomy code 2085R0001X. Dr. Prionas is licensed in California.
Specialties and state licenses
- Radiation oncology, CaliforniaPrimary
Radiation oncologists near Dr. Prionas
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. Nicolas Demetrios Prionas billed Medicare for 999 services in 2024
CMS data shows 999 Medicare services from Dr. Prionas across 16 procedure codes in 2024, for 145 Medicare patients. Medicare paid $90,488 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Prionas' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 6502024: 84330%
- Office and hospital visits
- 2023: 632024: 8738%
- Other services
- 2023: 702024: 691%
Dr. Prionas compared with the California median for radiation oncologists, 2024
- Dr. Prionas
- California median
- Medicare services
- 999vs 1,44431% below
- Medicare patients
- 145vs 16412% below
Medians across 633 radiation oncologists in California with Dmand AI profiles that report each measure.
Dr. Prionas' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Prionas?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Prionas and other radiation oncologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nicolas Demetrios Prionas treated 145 Medicare patients in 2024, average age 73
CMS counts 145 Medicare patients who saw Dr. Prionas in 2024. The largest group is 65 to 74, with 78 patients. 75% of them have cancer, and 63% have high cholesterol. 28% are also on Medicaid. Their average risk score is 1.47, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Prionas' median patient age at 66, with 89% women.
Dr. Prionas' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Prionas' Medicare patients by sex, 2024
- Women11277%
- Men3323%
Chronic conditions among Dr. Prionas' Medicare patients, 2024
- Cancer75%
- High cholesterol63%
- High blood pressure53%
- Arthritis34%
- Osteoporosis30%
- Mood disorders24%
- Chronic kidney disease21%
- Diabetes20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Prionas' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women89%
- Men9%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nicolas Demetrios Prionas wrote 12 Medicare Part D claims in 2024
In 2024, Dr. Prionas wrote 12 Medicare Part D claims for 12 patients. 100% of them were for generic drugs.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Nicolas Demetrios Prionas scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Prionas for performance year 2024, reported as part of a group. Dr. Prionas accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Prionas as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Prionas' MIPS scores, performance year 2024
- 87of 100Final score
- 86.8of 100Quality
- 40of 100Improvement Activities
- 70of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Nicolas Demetrios Prionas has 18 publications on record
Dmand AI links 18 papers to Dr. Prionas, published from 2011 to 2025. 2012 was the busiest year, with 2. The most frequent topics are Breast Neoplasms, Mastectomy and Mastectomy, Segmental. Dr. Prionas has published most often in Int J Radiat Oncol Biol Phys. Dr. Prionas' most frequent co-authors are Mark K. Buyyounouski, MD, Daniel Tandel Chang, MD and Michael F. Gensheimer, MD.
Dr. Prionas' papers by year, 2011 to 2025
Topics Dr. Prionas writes about most
- Breast Neoplasms
- Mastectomy
- Mastectomy, Segmental
- Radiotherapy Planning, Computer-Assisted
- Breast
- Mammography
- Monte Carlo Method
- Phantoms, Imaging
Dr. Prionas' most frequent co-authors
- Mark K. Buyyounouski, MD2 shared papers
- Daniel Tandel Chang, MD2 shared papers
- Michael F. Gensheimer, MD2 shared papers
Recent publications by Dr. Prionas
A Couch Mounted Smartphone-based Motion Monitoring System for Radiation Therapy (opens in a new tab)
Pract Radiat Oncol
Plast Reconstr Surg
See who Dr. Prionas researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Prionas works with, so you can find a warm path to the right radiation oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Nicolas Demetrios Prionas graduated from University of California, Davis School of Medicine
Dr. Prionas graduated from University of California, Davis School of Medicine in 2014.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Nicolas Demetrios Prionas's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Nicolas Demetrios Prionas
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Nicolas Demetrios Prionas' NPI number?
Dr. Nicolas Demetrios Prionas' NPI number is 1972840361. It was assigned on January 7, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. Nicolas Demetrios Prionas?
Dr. Nicolas Demetrios Prionas is a radiation oncologist in San Francisco, California. The primary specialty in the NPI Registry is Radiation Oncology Physician (taxonomy code 2085R0001X).
Where does Dr. Nicolas Demetrios Prionas practice?
Dr. Prionas practices at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143. Dr. Prionas' primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. Dmand AI also links Dr. Prionas to 2 group practices and clinics and 2 medical groups.
What is Dr. Nicolas Demetrios Prionas' office phone number?
The practice phone on file for Dr. Prionas is (415) 353-2733.
What is Dr. Nicolas Demetrios Prionas' medical license number?
Dr. Prionas holds California license A138608.
Which hospitals is Dr. Nicolas Demetrios Prionas affiliated with?
Dr. Prionas practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California.
What medical group is Dr. Nicolas Demetrios Prionas part of?
Dr. Prionas is linked to UCSF Pediatrics. Dmand AI links Dr. Prionas to 2 more medical groups.
Does Dr. Nicolas Demetrios Prionas accept Medicare?
Yes. CMS data shows Dr. Prionas billed Medicare for 999 services in 2024, and Dr. Prionas accepts Medicare assignment.
Does Dr. Nicolas Demetrios Prionas offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Prionas as offering telehealth services.
What is Dr. Nicolas Demetrios Prionas' MIPS score?
Dr. Prionas' MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
Show 6 more questionsShow fewer questions
How many Medicare patients does Dr. Nicolas Demetrios Prionas see?
CMS counts 145 Medicare patients who saw Dr. Prionas in 2024, with an average age of 73.
What services does Dr. Nicolas Demetrios Prionas bill to Medicare?
In 2024, Dr. Prionas' most billed Medicare services were radiation oncology (77014), radiation oncology (77300) and radiation oncology (77427).
Where did Dr. Nicolas Demetrios Prionas go to medical school?
Dr. Prionas graduated from University of California, Davis School of Medicine in 2014.
How long has Dr. Nicolas Demetrios Prionas been practicing?
Dr. Prionas graduated from medical school in 2014, 12 years ago.
Does Dr. Nicolas Demetrios Prionas do research?
Dmand AI links 18 publications to Dr. Prionas, published from 2011 to 2025.
Who does Dr. Nicolas Demetrios Prionas publish with?
Dr. Prionas' most frequent co-authors are Mark K. Buyyounouski, MD (2 shared papers), Daniel Tandel Chang, MD (2 shared papers) and Michael F. Gensheimer, MD (2 shared papers).
Selling to radiation oncology practices?
See radiation oncologists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card