Dr. Nicholas J. Zarkadis, DO
- Medicare patients, 2024
- 73
- Part D claims, 2024
- 247
- Publications
- 12
- Hospital affiliations
- 5
- Industry payments
- $26,694
- Practice address
- 114 Piper Hill Dr, Saint Peters, MO 63376
- Practice phone
- Call (636) 928-1670
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
St Peters Ambulatory Surgery Center
Saint Peters, Missouri
Find Dr. Zarkadis' 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. Nicholas J. Zarkadis is an orthopedic surgeon in Saint Peters, Missouri
Dr. Zarkadis practices at St Peters Ambulatory Surgery Center in Saint Peters, Missouri.
Dr. Zarkadis' NPI, 1033558259, was assigned on June 20, 2013. Dr. Zarkadis holds Missouri license 2019016580.
- NPI
- 1033558259NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3375957970
- NPI enumeration date
- June 20, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (636) 928-1670
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nicholas J. Zarkadis practices at St Peters Ambulatory Surgery Center in Saint Peters, Missouri
Dr. Zarkadis' primary practice is St Peters Ambulatory Surgery Center, at 114 Piper Hill Dr, Saint Peters, MO 63376 in Saint Charles County. The practice phone is (636) 928-1670.
- St Peters Ambulatory Surgery Center114 Piper Hill Dr, Saint Peters, MO 63376 · Saint Charles CountyPhone(636) 928-1670
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Nicholas J. Zarkadis is affiliated with 8 sites of care and 2 medical groups
Dr. Zarkadis' primary practice is St Peters Ambulatory Surgery Center in Saint Peters, Missouri. Dr. Zarkadis is also affiliated with Barnes-Jewish St. Peters Hospital. The medical group on file is Advanced Bone & Joint. Dmand AI also links Dr. Zarkadis to 4 more hospitals, 2 group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Nicholas J. Zarkadis' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zarkadis practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St Peters Ambulatory Surgery Center | Available with a free account |
| +7 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nicholas J. Zarkadis is one of 417 orthopedic surgeons in Missouri
Orthopaedic surgery is Dr. Zarkadis' primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dmand AI has Dr. Zarkadis' licenses on file in 2 states: Missouri and Nebraska.
Specialties and state licenses
- Orthopaedic surgery, MissouriPrimary
- Nebraska license
Orthopedic surgeons near Dr. Zarkadis
Counts of orthopedic 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. Nicholas J. Zarkadis treated 73 Medicare patients in 2024, average age 75
CMS counts 73 Medicare patients who saw Dr. Zarkadis in 2024. The largest group is 65 to 74, with 35 patients. 75% of them have arthritis, and 75% have high blood pressure. 15% are also on Medicaid. Their average risk score is 1.27, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Zarkadis' median patient age at 64, with 61% women.
Dr. Zarkadis' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Zarkadis' Medicare patients by sex, 2024
- Women5170%
- Men2230%
Chronic conditions among Dr. Zarkadis' Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
- Diabetes38%
- Anxiety30%
- Depression30%
- Mood disorders29%
- Chronic kidney disease26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Zarkadis' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women61%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nicholas J. Zarkadis wrote 247 Medicare Part D claims in 2024
In 2024, Dr. Zarkadis wrote 247 Medicare Part D claims for 63 patients. 97% of them were for generic drugs. CMS names the drug for 214 of them, across 5 drugs with 11 or more claims each, at $855 in total drug cost.
Dr. Zarkadis' Part D claims by kind of drug, 2024
- Generic239 claims97%
- Brand-name and other8 claims3%
Dr. Zarkadis' 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. Zarkadis' Part D claims, 2024
- Opioids41%102 of 247 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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. Nicholas J. Zarkadis ranks in the 59th percentile for hip replacement in Medicare
Dr. Zarkadis accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 15 procedures of hip replacement by Dr. Zarkadis, more than 59% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Zarkadis ranks in Medicare procedure volume
- Hip replacement
- 59th percentile15 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Knee replacement: 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)
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Dr. Nicholas J. Zarkadis has 12 publications on record
Dmand AI links 12 papers to Dr. Zarkadis, published from 2013 to 2024. 2017 was the busiest year, with 3. Dr. Zarkadis has published most often in J Orthop. Dr. Zarkadis' most frequent co-authors are Nicholas Anthony Kusnezov, MD, Mark Peter Pallis, DO and Gautham Sivaraj Prabhakar, MD.
Dr. Zarkadis' papers by year, 2013 to 2024
Dr. Zarkadis' most frequent co-authors
- Nicholas Anthony Kusnezov, MD6 shared papers
- Mark Peter Pallis, DO3 shared papers
- Gautham Sivaraj Prabhakar, MD3 shared papers
Recent publications by Dr. Zarkadis
JBJS Case Connect
See who Dr. Zarkadis researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Zarkadis works with, so you can find a warm path to the right orthopedic surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Nicholas J. Zarkadis received $26,694 in industry payments from 2017 to 2025
CMS Open Payments shows 86 general payments to Dr. Zarkadis from 11 drug and device companies from 2017 to 2025. Grants make up the largest share, 56% of the total. Smith & Nephew, Inc. paid the most, $15,893.
General payments to Dr. Zarkadis by program year, 2017 to 2025
General payments to Dr. Zarkadis by kind, 2017 to 2025
- Grants$15,00056%
- Education$4,51117%
- Food and beverage$4,39316%
- Travel and lodging$2,79010%
Companies that paid Dr. Zarkadis the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Nicholas J. Zarkadis'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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)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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Nicholas J. Zarkadis
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. Nicholas J. Zarkadis' NPI number?
Dr. Nicholas J. Zarkadis' NPI number is 1033558259. It was assigned on June 20, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. Nicholas J. Zarkadis?
Dr. Nicholas J. Zarkadis is an orthopedic surgeon in Saint Peters, Missouri. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Nicholas J. Zarkadis practice?
Dr. Zarkadis practices at 114 Piper Hill Dr, Saint Peters, MO 63376. Dr. Zarkadis' primary practice is St Peters Ambulatory Surgery Center in Saint Peters, Missouri. Dmand AI also links Dr. Zarkadis to 4 hospitals, 2 group practices and clinics and 1 medical group.
What is Dr. Nicholas J. Zarkadis' office phone number?
The practice phone on file for Dr. Zarkadis is (636) 928-1670.
What is Dr. Nicholas J. Zarkadis' medical license number?
Dr. Zarkadis holds Missouri license 2019016580, one of the licenses on file in 2 states.
Which states has Dr. Nicholas J. Zarkadis been licensed in?
Dmand AI has state licenses on file for Dr. Zarkadis in Missouri and Nebraska.
Which hospitals is Dr. Nicholas J. Zarkadis affiliated with?
Dr. Zarkadis is affiliated with Barnes-Jewish St. Peters Hospital. Dmand AI links Dr. Zarkadis to 4 more hospitals.
What medical group is Dr. Nicholas J. Zarkadis part of?
Dr. Zarkadis is linked to Advanced Bone & Joint. Dmand AI links Dr. Zarkadis to 1 more medical group.
Does Dr. Nicholas J. Zarkadis accept Medicare?
Yes. CMS lists Dr. Zarkadis as accepting Medicare assignment.
How many Medicare patients does Dr. Nicholas J. Zarkadis see?
CMS counts 73 Medicare patients who saw Dr. Zarkadis in 2024, with an average age of 75.
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What drugs does Dr. Nicholas J. Zarkadis prescribe most?
In 2024 Medicare Part D data, Dr. Zarkadis' most prescribed drugs by claims were Oxycodone HCl, Pantoprazole Sodium and Tramadol HCl.
Has Dr. Nicholas J. Zarkadis received payments from drug or device companies?
CMS Open Payments shows $26,694 in general payments to Dr. Zarkadis from 11 companies from 2017 to 2025. The largest total came from Smith & Nephew, Inc.
How long has Dr. Nicholas J. Zarkadis been practicing?
Dr. Zarkadis graduated from medical school in 2013, 13 years ago.
Does Dr. Nicholas J. Zarkadis do research?
Dmand AI links 12 publications to Dr. Zarkadis, published from 2013 to 2024.
Who does Dr. Nicholas J. Zarkadis publish with?
Dr. Zarkadis' most frequent co-authors are Nicholas Anthony Kusnezov, MD (6 shared papers), Mark Peter Pallis, DO (3 shared papers) and Gautham Sivaraj Prabhakar, MD (3 shared papers).
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