Mark C. Thomas
- Medicare patients, 2024
- 120
- Part D claims, 2024
- 86
- MIPS score, 2024
- 88
- Hospital affiliations
- 2
- Industry payments
- $26
- Practice address
- 50 Route 25A, Smithtown, NY 11787
- Practice phone
- Call (631) 862-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Mark Thomas' 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.
Mark C. Thomas is a family nurse practitioner in Smithtown, New York
Mark Thomas practices at St. Catherine of Siena Hospital in Smithtown, New York, part of Diocese of Rockville Centre.
Mark Thomas' NPI, 1649959487, was assigned on July 17, 2023. Mark Thomas holds New York license F352368-01.
- NPI
- 1649959487NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3072977651
- NPI enumeration date
- July 17, 2023
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (631) 862-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 29
- Medical school graduation
- 2023
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Mark C. Thomas practices at St. Catherine of Siena Hospital in Smithtown, New York
Mark Thomas' primary practice is St. Catherine of Siena Hospital, at 50 Route 25A, Smithtown, NY 11787 in Suffolk County. The practice phone is (631) 862-3000.
- St. Catherine of Siena Hospital50 Route 25A, Smithtown, NY 11787 · Suffolk CountyPhone(631) 862-3000
Source: Dmand AI Affiliation Data
Mark C. Thomas is affiliated with 4 sites of care and 4 medical groups
Mark Thomas' primary practice is St. Catherine of Siena Hospital in Smithtown, New York, part of Diocese of Rockville Centre. Mark Thomas is also affiliated with Good Samaritan University Hospital. The medical group on file is Melville Medical Care. Dmand AI also links Mark Thomas to 3 more medical groups and 2 group practices and clinics, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Mark C. Thomas' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Mark Thomas practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Catherine of Siena Hospital | Available with a free account |
| +3 more sites and 3 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 Diocese of Rockville Centre and 6.2K+ hospitals, with verified contacts in the same login.
Mark C. Thomas is one of 10,214 family nurse practitioners in New York
Family is Mark Thomas' primary specialty in the NPI Registry, under taxonomy code 363LF0000X. Mark Thomas is licensed in New York.
Specialties and state licenses
- Family nurse practitioner, New YorkPrimary
Family nurse practitioners near Mark Thomas
Counts of family nurse practitioners 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
Mark C. Thomas treated 120 Medicare patients in 2024, average age 67
CMS counts 120 Medicare patients who saw Mark Thomas in 2024. The largest group is under 65, with 47 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 54% are also on Medicaid. Their average risk score is 2.63, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Mark Thomas' median patient age at 63, with 63% women.
Mark Thomas' Medicare patients by age, 2024
Mark Thomas' Medicare patients by sex, 2024
- Women6957%
- Men5143%
Chronic conditions among Mark Thomas' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Mood disorders75%
- Anxiety72%
- Depression68%
- Arthritis62%
- Ischemic heart disease53%
- Chronic kidney disease44%
Share of Medicare patients with each condition. A patient can have several.
Mark Thomas' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women63%
- Men37%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Mark C. Thomas wrote 86 Medicare Part D claims in 2024
In 2024, Mark Thomas wrote 86 Medicare Part D claims for 45 patients. 90% of them were for generic drugs.
Mark Thomas' Part D claims by kind of drug, 2024
- Generic77 claims90%
- Brand-name and other9 claims10%
Drug classes CMS tracks in Mark Thomas' Part D claims, 2024
- Antibiotics38%33 of 86 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Mark C. Thomas scored 88 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 88 out of 100 for Mark Thomas for performance year 2024, reported as part of a group. Mark Thomas accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Mark Thomas' MIPS scores, performance year 2024
- 88of 100Final score
- 76.1of 100Quality
- 40of 100Improvement Activities
- 69of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Mark C. Thomas received $26 in industry payments in 2025
CMS Open Payments shows 1 general payment to Mark Thomas from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Melinta Therapeutics, Inc. paid the most, $26.
Companies that paid Mark Thomas the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Mark C. Thomas'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 (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)Clinician Public Reporting: Overall MIPS Performance (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 Mark C. Thomas
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Mark C. Thomas' NPI number?
Mark C. Thomas' NPI number is 1649959487. It was assigned on July 17, 2023, and it is active in the NPI Registry.
What does Mark C. Thomas specialize in?
Mark C. Thomas is a family nurse practitioner in Smithtown, New York. The primary specialty in the NPI Registry is Family Nurse Practitioner (taxonomy code 363LF0000X).
Where does Mark C. Thomas practice?
Mark Thomas practices at 50 Route 25A, Smithtown, NY 11787. Mark Thomas' primary practice is St. Catherine of Siena Hospital in Smithtown, New York, part of Diocese of Rockville Centre. Dmand AI also links Mark Thomas to 3 medical groups and 2 group practices and clinics.
What is Mark C. Thomas' office phone number?
The practice phone on file for Mark Thomas is (631) 862-3000.
What is Mark C. Thomas' medical license number?
Mark Thomas holds New York license F352368-01.
Which hospitals is Mark C. Thomas affiliated with?
Mark Thomas practices at St. Catherine of Siena Hospital in Smithtown, New York. Mark Thomas is also affiliated with Good Samaritan University Hospital.
What medical group is Mark C. Thomas part of?
Mark Thomas is linked to Melville Medical Care. Dmand AI links Mark Thomas to 3 more medical groups.
Does Mark C. Thomas accept Medicare?
Yes. CMS lists Mark Thomas as accepting Medicare assignment.
What is Mark C. Thomas' MIPS score?
Mark Thomas' MIPS final score for performance year 2024 is 88 out of 100, reported as part of a group.
How many Medicare patients does Mark C. Thomas see?
CMS counts 120 Medicare patients who saw Mark Thomas in 2024, with an average age of 67.
Has Mark C. Thomas received payments from drug or device companies?
CMS Open Payments shows $26 in general payments to Mark Thomas from 1 company from 2025 to 2025. The largest total came from Melinta Therapeutics, Inc.
How long has Mark C. Thomas been practicing?
Mark Thomas graduated from medical school in 2023, 3 years ago.
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