Dr. Nektarios George Mastoris, MD
- Medicare patients, 2024
- 30
- Part D claims, 2023
- 16
- Hospital affiliations
- 2
- Industry payments
- $633
- Medical group
- 1
- Practice address
- 2233 W Division St, Chicago, IL 60622
- Practice phone
- Call (312) 770-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mastoris' 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. Nektarios George Mastoris is an anesthesiologist in Chicago, Illinois
Dr. Mastoris practices at Saint Mary of Nazareth Hospital in Chicago, Illinois, part of Prime Healthcare Services.
Dr. Mastoris' NPI, 1437712379, was assigned on April 16, 2019. Dr. Mastoris holds Illinois license 036165374.
- NPI
- 1437712379NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5597290619
- NPI enumeration date
- April 16, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (312) 770-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nektarios George Mastoris practices at Saint Mary of Nazareth Hospital in Chicago, Illinois
Dr. Mastoris' primary practice is Saint Mary of Nazareth Hospital, at 2233 W Division St, Chicago, IL 60622 in Cook County. The practice phone is (312) 770-2000.
- Saint Mary of Nazareth Hospital2233 W Division St, Chicago, IL 60622 · Cook CountyPhone(312) 770-2000
Source: Dmand AI Affiliation Data
Dr. Nektarios George Mastoris is affiliated with 2 sites of care and 1 medical group
Dr. Mastoris' primary practice is Saint Mary of Nazareth Hospital in Chicago, Illinois, part of Prime Healthcare Services. Dr. Mastoris is also affiliated with Resurrection Medical Center. The medical group on file is Northstar Anesthesia.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nektarios George Mastoris' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mastoris practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Saint Mary of Nazareth Hospital | Available with a free account |
| +1 more affiliated site | 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 Prime Healthcare Services and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Nektarios George Mastoris is one of 1,887 anesthesiologists in Illinois
Anesthesiology is Dr. Mastoris' primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Mastoris is licensed in Illinois.
Specialties and state licenses
- Anesthesiology, IllinoisPrimary
Anesthesiologists near Dr. Mastoris
Counts of anesthesiologists 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. Nektarios George Mastoris treated 30 Medicare patients in 2024, average age 70
CMS counts 30 Medicare patients who saw Dr. Mastoris in 2024. The largest group is 65 to 74, with 14 patients. 75% of them have high blood pressure, and 70% have high cholesterol. Their average risk score is 1.74, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Mastoris' median patient age at 69, with 46% women.
Dr. Mastoris' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Mastoris' Medicare patients by sex, 2024
- Women1447%
- Men1653%
Chronic conditions among Dr. Mastoris' Medicare patients, 2024
- High blood pressure75%
- High cholesterol70%
- Arthritis67%
- Diabetes57%
- Mood disorders37%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mastoris' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women46%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nektarios George Mastoris wrote 16 Medicare Part D claims in 2023
In 2023, Dr. Mastoris wrote 16 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $197 in total drug cost.
Dr. Mastoris' most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. Nektarios George Mastoris takes part in Medicare
Dr. Mastoris 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. Nektarios George Mastoris received $633 in industry payments from 2024 to 2025
CMS Open Payments shows 6 general payments to Dr. Mastoris from 3 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. Spinefrontier, Inc. paid the most, $356.
General payments to Dr. Mastoris by program year, 2024 to 2025
Companies that paid Dr. Mastoris the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Nektarios George Mastoris'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 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 and Drug (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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Nektarios George Mastoris
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. Nektarios George Mastoris' NPI number?
Dr. Nektarios George Mastoris' NPI number is 1437712379. It was assigned on April 16, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Nektarios George Mastoris?
Dr. Nektarios George Mastoris is an anesthesiologist in Chicago, Illinois. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. Nektarios George Mastoris practice?
Dr. Mastoris practices at 2233 W Division St, Chicago, IL 60622. Dr. Mastoris' primary practice is Saint Mary of Nazareth Hospital in Chicago, Illinois, part of Prime Healthcare Services.
What is Dr. Nektarios George Mastoris' office phone number?
The practice phone on file for Dr. Mastoris is (312) 770-2000.
What is Dr. Nektarios George Mastoris' medical license number?
Dr. Mastoris holds Illinois license 036165374.
Which hospitals is Dr. Nektarios George Mastoris affiliated with?
Dr. Mastoris practices at Saint Mary of Nazareth Hospital in Chicago, Illinois. Dr. Mastoris is also affiliated with Resurrection Medical Center.
What medical group is Dr. Nektarios George Mastoris part of?
Dr. Mastoris is linked to Northstar Anesthesia.
Does Dr. Nektarios George Mastoris accept Medicare?
Yes. CMS lists Dr. Mastoris as accepting Medicare assignment.
How many Medicare patients does Dr. Nektarios George Mastoris see?
CMS counts 30 Medicare patients who saw Dr. Mastoris in 2024, with an average age of 70.
What drugs does Dr. Nektarios George Mastoris prescribe most?
In 2023 Medicare Part D data, Dr. Mastoris' most prescribed drugs by claims were Gabapentin.
Has Dr. Nektarios George Mastoris received payments from drug or device companies?
CMS Open Payments shows $633 in general payments to Dr. Mastoris from 3 companies from 2024 to 2025. The largest total came from Spinefrontier, Inc.
How long has Dr. Nektarios George Mastoris been practicing?
Dr. Mastoris graduated from medical school in 2018, 8 years ago.
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