Dr. Nicholas W. Gemma, MD
- Medicare services, 2021
- 155,461
- Part D claims, 2022
- 102
- Publications
- 2
- Hospital affiliations
- 1
- Industry payments
- $950
- Practice address
- 667 Eastland Ave SE, Warren, OH 44484
- Practice phone
- Call (330) 841-4016
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Gemma's professional email, personal email and mobile number
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Dr. Nicholas W. Gemma is a hematologist and oncologist in Warren, Ohio
Dr. Gemma practices at Mercy Health - St. Joseph Warren Hospital in Warren, Ohio, part of Bon Secours Mercy Health.
Dr. Gemma's NPI, 1346284098, was assigned on June 15, 2006. Dr. Gemma graduated from University of Virginia School of Medicine in 1985. Dr. Gemma holds Virginia license 0101041458.
- NPI
- 1346284098NPI Registry (opens in a new tab)
- NPI enumeration date
- June 15, 2006
- NPI status
- Active
- Practice phone
- (330) 841-4016
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Nicholas W. Gemma practices at Mercy Health - St. Joseph Warren Hospital in Warren, Ohio
Dr. Gemma's primary practice is Mercy Health - St. Joseph Warren Hospital, at 667 Eastland Ave SE, Warren, OH 44484 in Trumbull County. The practice phone is (330) 841-4016.
- Mercy Health - St. Joseph Warren Hospital667 Eastland Ave SE, Warren, OH 44484 · Trumbull CountyPhone(330) 841-4016
Source: Dmand AI Affiliation Data
Dr. Nicholas W. Gemma is affiliated with 2 sites of care
Dr. Gemma's primary practice is Mercy Health - St. Joseph Warren Hospital in Warren, Ohio, part of Bon Secours Mercy Health. Dmand AI also links Dr. Gemma to 1 hospital outpatient department, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nicholas W. Gemma's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gemma practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mercy Health - St. Joseph Warren 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 Bon Secours Mercy Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Nicholas W. Gemma is one of 460 hematologists and oncologists in Ohio
Hematology and oncology is Dr. Gemma's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Gemma is licensed in Virginia.
Specialties and state licenses
- Hematology and oncology, VirginiaPrimary
Hematologists and oncologists near Dr. Gemma
Counts of hematologists and 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. Nicholas W. Gemma billed Medicare for 155,461 services in 2021
CMS data shows 155,461 Medicare services from Dr. Gemma across 71 procedure codes in 2021. Medicare paid $1,878,287 for them.
Dr. Gemma's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Drugs given in the office
- 2020: 144,2372021: 138,8274%
- Other services
- 2020: 3,6022021: 8,713142%
- Tests and treatments
- 2020: 3,4772021: 3,5472%
- Lab and pathology
- 2020: 2,6362021: 2,7595%
- Office and hospital visits
- 2020: 1,2922021: 1,14212%
- Surgery
- 2020: 3412021: 47339%
Where Dr. Gemma's Medicare services took place, 2021
- In an office155,407100%
- In a facility540%
Dr. Gemma compared with the Ohio median for hematologists and oncologists, 2021
- Dr. Gemma
- Ohio median
- Medicare services
- 155,461vs 626248.3 times
- Part D claims
- 102vs 47879% below
Medians across 452 hematologists and oncologists in Ohio with Dmand AI profiles that report each measure.
Dr. Gemma's most billed Medicare procedure codes, 2021
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. Gemma?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gemma and other hematologists and oncologists in Ohio.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nicholas W. Gemma's patients have a median age of 79
Across all payers, Dmand AI patient panel data puts Dr. Gemma's median patient age at 79, with 67% women.
Dr. Gemma's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 79
Patient panel by sex, all payers
- Women67%
- Men33%
Source: Dmand AI Patient Panel Data
Dr. Nicholas W. Gemma wrote 102 Medicare Part D claims in 2022
In 2022, Dr. Gemma wrote 102 Medicare Part D claims. They cover 4 drugs, with $24,432 in total drug cost. In 2021, CMS named 963 claims across 30 drugs.
Dr. Gemma's 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: 9632022: 10289%
Drugs named by CMS: 4 in 2022, 30 in 2021.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Nicholas W. Gemma has 2 publications on record
Dmand AI links 2 papers to Dr. Gemma in 2024. Dr. Gemma's most frequent co-authors are Erica Lee Laipply, MD and Truong Ma, MD.
Dr. Gemma's most frequent co-authors
Recent publications by Dr. Gemma
See who Dr. Gemma researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Gemma works with, so you can find a warm path to the right hematologists and oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Nicholas W. Gemma received $950 in industry payments from 2016 to 2024
CMS Open Payments shows 36 general payments to Dr. Gemma from 15 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 81% of the total. Bristol-Myers Squibb Company paid the most, $298.
General payments to Dr. Gemma by program year, 2016 to 2024
General payments to Dr. Gemma by kind, 2016 to 2024
- Food and beverage$76781%
- Education$18319%
Companies that paid Dr. Gemma the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Nicholas W. Gemma graduated from University of Virginia School of Medicine
Dr. Gemma graduated from University of Virginia School of Medicine in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Nicholas W. Gemma'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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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) |
| 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. Nicholas W. Gemma
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 W. Gemma's NPI number?
Dr. Nicholas W. Gemma's NPI number is 1346284098. It was assigned on June 15, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Nicholas W. Gemma?
Dr. Nicholas W. Gemma is a hematologist and oncologist in Warren, Ohio. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Dr. Nicholas W. Gemma practice?
Dr. Gemma practices at 667 Eastland Ave SE, Warren, OH 44484. Dr. Gemma's primary practice is Mercy Health - St. Joseph Warren Hospital in Warren, Ohio, part of Bon Secours Mercy Health. Dmand AI also links Dr. Gemma to 1 hospital outpatient department.
What is Dr. Nicholas W. Gemma's office phone number?
The practice phone on file for Dr. Gemma is (330) 841-4016.
What is Dr. Nicholas W. Gemma's medical license number?
Dr. Gemma holds Virginia license 0101041458.
Which hospitals is Dr. Nicholas W. Gemma affiliated with?
Dr. Gemma practices at Mercy Health - St. Joseph Warren Hospital in Warren, Ohio.
Does Dr. Nicholas W. Gemma accept Medicare?
Yes. CMS data shows Dr. Gemma billed Medicare for 155,461 services in 2021.
What services does Dr. Nicholas W. Gemma bill to Medicare?
In 2021, Dr. Gemma's most billed Medicare services were injected or infused drug (J1439), injected or infused drug (J1453) and injected or infused drug (J0881).
Where did Dr. Nicholas W. Gemma go to medical school?
Dr. Gemma graduated from University of Virginia School of Medicine in 1985.
What drugs does Dr. Nicholas W. Gemma prescribe most?
In 2022 Medicare Part D data, Dr. Gemma's most prescribed drugs by claims were Letrozole, Xarelto and Anastrozole.
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Has Dr. Nicholas W. Gemma received payments from drug or device companies?
CMS Open Payments shows $950 in general payments to Dr. Gemma from 15 companies from 2016 to 2024. The largest total came from Bristol-Myers Squibb Company.
How long has Dr. Nicholas W. Gemma been practicing?
Dr. Gemma graduated from medical school in 1985, 41 years ago.
Does Dr. Nicholas W. Gemma do research?
Dmand AI links 2 publications to Dr. Gemma.
Who does Dr. Nicholas W. Gemma publish with?
Dr. Gemma's most frequent co-authors are Erica Lee Laipply, MD (2 shared papers) and Truong Ma, MD (1 shared paper).
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