Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Demetrius Peter Rizos, DO

Individual provider Internal Medicine Physician · NPI 1063491397

Demetrius Peter Rizos, DO practises Nephrology in Brookline, Massachusetts. Graduated from Nova Southeastern College of Osteo Medicine in 1998, 28 years ago. Practices with Cogent Healthcare of Montana P C, a 82-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
28
Trained at
Nova Southeastern College of Osteo Medicine
Licensed in
MA
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

637 Washington St Ste 100
Brookline, MA 02446-4579
Phone: (617) 798-1600
Fax: (617) 798-1900
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 212775 (MA)
Nephrology Physician Taxonomy 207RN0300X · Licence 212775 (MA)

Record details

NPI number1063491397
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJanuary 13, 2006
Last updated in NPPESSeptember 30, 2026
Certification dateSeptember 30, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNEPHROLOGY
Also practisesHOSPITALIST
Medical schoolNOVA SOUTHEASTERN COLLEGE OF OSTEO MEDICINE
Graduated 1998 (28 years in practice)
Group practice Cogent Healthcare Of Montana P C — 82 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients153
Services billed 191 a service is one billed item, such as a visit, a test or a procedure
Average patient age86

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $22 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Cogent Healthcare of Montana P C

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 82 clinicians in the practice; 12 are shown here.

Other providers in Brookline