Dr. Nikolaos Zacharias, MD
- Medicare services, 2024
- 1,223
- Medicare patients, 2024
- 901
- Part D claims, 2024
- 28
- Hospital affiliations
- 4
- Industry payments
- $4,371
- Practice address
- 55 Fruit Street, Boston, MA 02114
- Practice phone
- Call (617) 726-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Zacharias' 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. Nikolaos Zacharias is a vascular surgeon in Boston, Massachusetts
Dr. Zacharias practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Zacharias' NPI, 1023251717, was assigned on April 12, 2009. Dr. Zacharias holds New Hampshire license 17544.
- NPI
- 1023251717NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032497151
- NPI enumeration date
- April 12, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (617) 726-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nikolaos Zacharias practices at Massachusetts General Hospital in Boston, Massachusetts
Dr. Zacharias' primary practice is Massachusetts General Hospital, at 55 Fruit Street, Boston, MA 02114 in Suffolk County. The practice phone is (617) 726-2000.
- Massachusetts General Hospital55 Fruit Street, Boston, MA 02114 · Suffolk CountyPhone(617) 726-2000
Source: Dmand AI Affiliation Data
Dr. Nikolaos Zacharias is affiliated with 6 sites of care and 6 medical groups
Dr. Zacharias' primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dr. Zacharias is also affiliated with Dartmouth Hitchcock Medical Center. The medical group on file is Massachusetts General Physicians Organization (MGPO). Dmand AI also links Dr. Zacharias to 2 more hospitals, 5 medical groups, 1 community health center and 1 home health agency, 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. Nikolaos Zacharias' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zacharias practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Massachusetts General Hospital | Available with a free account |
| +5 more sites and 5 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 Mass General Brigham and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Nikolaos Zacharias is one of 138 vascular surgeons in Massachusetts
Vascular surgery is Dr. Zacharias' primary specialty in the NPI Registry, under taxonomy code 2086S0129X. Dr. Zacharias is licensed in New Hampshire.
Specialties and state licenses
- Vascular surgery, New HampshirePrimary
Vascular surgeons near Dr. Zacharias
Counts of vascular surgeons 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. Nikolaos Zacharias billed Medicare for 1,223 services in 2024
CMS data shows 1,223 Medicare services from Dr. Zacharias across 23 procedure codes in 2024, for 901 Medicare patients. Medicare paid $67,307 for them.
Dr. Zacharias' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 6232024: 71915%
- Office and hospital visits
- 2023: 3932024: 392No change
- Imaging
- 2023: 792024: 7110%
- Surgery
- 2023: 02024: 41
Where Dr. Zacharias' Medicare services took place, 2024
- In an office32627%
- In a facility89773%
Dr. Zacharias compared with the Massachusetts median for vascular surgeons, 2024
- Dr. Zacharias
- Massachusetts median
- Medicare services
- 1,223vs 79853% above
- Medicare patients
- 901vs 50877% above
- Part D claims
- 30vs 4229% below
Medians across 137 vascular surgeons in Massachusetts with Dmand AI profiles that report each measure.
Dr. Zacharias' 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. Zacharias?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Zacharias and other vascular surgeons in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nikolaos Zacharias treated 901 Medicare patients in 2024, average age 75
CMS counts 901 Medicare patients who saw Dr. Zacharias in 2024. The largest group is 75 to 84, with 384 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 19% are also on Medicaid. Their average risk score is 2.19, 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. Zacharias' median patient age at 71, with 50% women.
Dr. Zacharias' Medicare patients by age, 2024
Dr. Zacharias' Medicare patients by sex, 2024
- Women41246%
- Men48954%
Chronic conditions among Dr. Zacharias' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis54%
- Ischemic heart disease54%
- Chronic kidney disease44%
- Diabetes41%
- Heart failure35%
- Anxiety33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Zacharias' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women50%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nikolaos Zacharias wrote 28 Medicare Part D claims in 2024
In 2024, Dr. Zacharias wrote 28 Medicare Part D claims for 21 patients. 100% of them were for generic drugs. They cover 2 drugs, with $9,371 in total drug cost. In 2021, CMS named 60 claims across 1 drug.
Dr. Zacharias' most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 602022: 3050%
Drugs named by CMS: 2 in 2022, 1 in 2021.
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
Dr. Nikolaos Zacharias ranks in the 81st percentile for leg revascularization (restoring blood flow) in Medicare
Dr. Zacharias accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Zacharias as offering telehealth. CMS counts 21 procedures of leg revascularization (restoring blood flow) by Dr. Zacharias, more than 81% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Zacharias ranks in Medicare procedure volume
- Leg revascularization (restoring blood flow)
- 81st percentile21 procedures
- Removal of tissue
- 66th percentile15 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Varicose vein removal: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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. Nikolaos Zacharias received $4,371 in industry payments from 2016 to 2025
CMS Open Payments shows 44 general payments to Dr. Zacharias from 9 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 45% of the total. W. L. Gore & Associates, Inc. paid the most, $2,455.
General payments to Dr. Zacharias by program year, 2016 to 2025
General payments to Dr. Zacharias by kind, 2016 to 2025
- Travel and lodging$1,94845%
- Food and beverage$1,71539%
- Education$70816%
Companies that paid Dr. Zacharias 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. Nikolaos Zacharias'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 and Drug (CMS) (opens in a new tab)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)Doctors and Clinicians Utilization Data (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. Nikolaos Zacharias
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. Nikolaos Zacharias' NPI number?
Dr. Nikolaos Zacharias' NPI number is 1023251717. It was assigned on April 12, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Nikolaos Zacharias?
Dr. Nikolaos Zacharias is a vascular surgeon in Boston, Massachusetts. The primary specialty in the NPI Registry is Vascular Surgery Physician (taxonomy code 2086S0129X).
Where does Dr. Nikolaos Zacharias practice?
Dr. Zacharias practices at 55 Fruit Street, Boston, MA 02114. Dr. Zacharias' primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Zacharias to 2 hospitals, 5 medical groups, 1 community health center and 1 home health agency.
What is Dr. Nikolaos Zacharias' office phone number?
The practice phone on file for Dr. Zacharias is (617) 726-2000.
What is Dr. Nikolaos Zacharias' medical license number?
Dr. Zacharias holds New Hampshire license 17544.
Which hospitals is Dr. Nikolaos Zacharias affiliated with?
Dr. Zacharias practices at Massachusetts General Hospital in Boston, Massachusetts. Dr. Zacharias is also affiliated with Dartmouth Hitchcock Medical Center. Dmand AI links Dr. Zacharias to 2 more hospitals.
What medical group is Dr. Nikolaos Zacharias part of?
Dr. Zacharias is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Zacharias to 5 more medical groups.
Does Dr. Nikolaos Zacharias accept Medicare?
Yes. CMS data shows Dr. Zacharias billed Medicare for 1,223 services in 2024, and Dr. Zacharias accepts Medicare assignment.
Does Dr. Nikolaos Zacharias offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Zacharias as offering telehealth services.
How many Medicare patients does Dr. Nikolaos Zacharias see?
CMS counts 901 Medicare patients who saw Dr. Zacharias in 2024, with an average age of 75.
Show 4 more questionsShow fewer questions
What services does Dr. Nikolaos Zacharias bill to Medicare?
In 2024, Dr. Zacharias' most billed Medicare services were office visit, established patient (99214), blood vessel study (93923) and blood vessel study (93880).
What drugs does Dr. Nikolaos Zacharias prescribe most?
In 2022 Medicare Part D data, Dr. Zacharias' most prescribed drugs by claims were Eliquis and Clopidogrel.
Has Dr. Nikolaos Zacharias received payments from drug or device companies?
CMS Open Payments shows $4,371 in general payments to Dr. Zacharias from 9 companies from 2016 to 2025. The largest total came from W. L. Gore & Associates, Inc.
How long has Dr. Nikolaos Zacharias been practicing?
Dr. Zacharias graduated from medical school in 2002, 24 years ago.
Selling to vascular surgery practices?
See vascular surgeons in Massachusetts 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