Dr. David R. Marks, MD
- Medicare services, 2024
- 970
- Medicare patients, 2024
- 210
- Part D claims, 2024
- 6,856
- Hospital affiliations
- 1
- Industry payments
- $5,925
- Practice address
- 130 Division St, Derby, CT 06418
- Practice phone
- Call (203) 732-7500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Marks' professional email, personal email and mobile number
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Dr. David R. Marks is an internist in Derby, Connecticut
Dr. Marks practices at Griffin Hospital in Derby, Connecticut, part of Griffin Hospital.
Dr. Marks' NPI, 1841486149, was assigned on September 20, 2007. Dr. Marks graduated from Yale School of Medicine in 1989. Dr. Marks holds Connecticut license 032912.
- NPI
- 1841486149NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7315014719
- NPI enumeration date
- September 20, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (203) 732-7500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 68
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. David R. Marks practices at 2 locations in Derby, Connecticut
Dr. Marks' primary practice is Griffin Hospital, at 130 Division St, Derby, CT 06418 in New Haven County. The practice phone is (203) 732-7500. Dr. Marks also practices at Griffin Hospital, 144 Division St, Derby, CT 06418.
- Griffin HospitalPrimary130 Division St, Derby, CT 06418 · New Haven CountyPhone(203) 732-7500
- Griffin Hospital144 Division St, Derby, CT 06418 · Naugatuck Vly CountyPhone(203) 732-7360
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. David R. Marks is affiliated with 7 sites of care and 3 medical groups
Dr. Marks' primary practice is Griffin Hospital in Derby, Connecticut, part of Griffin Hospital. The medical group on file is Griffin Faculty Physicians. Dmand AI also links Dr. Marks to 3 more home health agencies, 2 group practices and clinics, 2 medical groups and 1 therapy and rehab clinic, 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. David R. Marks' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marks practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Griffin Hospital | Available with a free account |
| +6 more sites and 2 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 Griffin Hospital and 6.2K+ hospitals, with verified contacts in the same login.
Dr. David R. Marks is one of 2,189 internists in Connecticut
Internal medicine is Dr. Marks' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Marks is licensed in Connecticut.
Specialties and state licenses
- Internal medicine, ConnecticutPrimary
Internists near Dr. Marks
Counts of internists 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. David R. Marks billed Medicare for 970 services in 2024
CMS data shows 970 Medicare services from Dr. Marks across 15 procedure codes in 2024, for 210 Medicare patients. Medicare paid $58,877 for them. Every service was in an office.
Dr. Marks' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6012024: 54210%
- Other services
- 2023: 1732024: 33091%
- Surgery
- 2023: 522024: 6423%
- Tests and treatments
- 2023: 312024: 3410%
Dr. Marks compared with the Connecticut median for internists, 2024
- Dr. Marks
- Connecticut median
- Medicare services
- 970vs 3902.5 times
- Medicare patients
- 210vs 17222% above
- Part D claims
- 6,168vs 34318.0 times
Medians across 2,185 internists in Connecticut with Dmand AI profiles that report each measure.
Dr. Marks' 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marks and other internists in Connecticut.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. David R. Marks treated 210 Medicare patients in 2024, average age 72
CMS counts 210 Medicare patients who saw Dr. Marks in 2024. The largest group is 65 to 74, with 85 patients. 72% of them have high blood pressure, and 67% have high cholesterol. 37% are also on Medicaid. Their average risk score is 1.38, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Marks' median patient age at 59, with 48% women.
Dr. Marks' Medicare patients by age, 2024
Dr. Marks' Medicare patients by sex, 2024
- Women9445%
- Men11655%
Chronic conditions among Dr. Marks' Medicare patients, 2024
- High blood pressure72%
- High cholesterol67%
- Arthritis37%
- Diabetes32%
- Ischemic heart disease27%
- Anxiety26%
- COPD23%
- Mood disorders23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marks' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women48%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. David R. Marks wrote 6,856 Medicare Part D claims in 2024
In 2024, Dr. Marks wrote 6,856 Medicare Part D claims for 730 patients. 87% of them were for generic drugs. CMS names the drug for 6,168 of them, across 104 drugs with 11 or more claims each, at $575,210 in total drug cost. In 2023, CMS named 5,712 claims across 97 drugs.
Dr. Marks' Part D claims by kind of drug, 2024
- Generic5,953 claims87%
- Brand-name862 claims13%
- Other41 claims1%
Dr. Marks' 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. Marks' Part D claims, 2024
- Opioids0%24 of 6,856 claims
- Antibiotics1%58 of 6,856 claims
- Antipsychotics, patients 65 and over0%18 of 6,856 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 5,7122024: 6,1688%
Drugs named by CMS: 104 in 2024, 97 in 2023.
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
How Dr. David R. Marks takes part in Medicare
Dr. Marks 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. David R. Marks received $5,925 in industry payments from 2016 to 2025
CMS Open Payments shows 330 general payments to Dr. Marks from 33 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $1,402.
General payments to Dr. Marks by program year, 2016 to 2025
Companies that paid Dr. Marks the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. David R. Marks graduated from Yale School of Medicine
Dr. Marks graduated from Yale School of Medicine in 1989.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. David R. Marks'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 Affiliation DataDmand AI Practice 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) |
| 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. David R. Marks
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. David R. Marks' NPI number?
Dr. David R. Marks' NPI number is 1841486149. It was assigned on September 20, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. David R. Marks?
Dr. David R. Marks is an internist in Derby, Connecticut. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. David R. Marks practice?
Dr. Marks practices at 130 Division St, Derby, CT 06418. Dr. Marks also practices at 144 Division St, Derby, CT 06418. Dr. Marks' primary practice is Griffin Hospital in Derby, Connecticut, part of Griffin Hospital. Dmand AI also links Dr. Marks to 3 home health agencies, 2 group practices and clinics, 2 medical groups and 1 therapy and rehab clinic.
What is Dr. David R. Marks' office phone number?
The practice phone on file for Dr. Marks is (203) 732-7500.
What is Dr. David R. Marks' medical license number?
Dr. Marks holds Connecticut license 032912.
Which hospitals is Dr. David R. Marks affiliated with?
Dr. Marks practices at Griffin Hospital in Derby, Connecticut.
What medical group is Dr. David R. Marks part of?
Dr. Marks is linked to Griffin Faculty Physicians. Dmand AI links Dr. Marks to 2 more medical groups.
Does Dr. David R. Marks accept Medicare?
Yes. CMS data shows Dr. Marks billed Medicare for 970 services in 2024, and Dr. Marks accepts Medicare assignment.
How many Medicare patients does Dr. David R. Marks see?
CMS counts 210 Medicare patients who saw Dr. Marks in 2024, with an average age of 72.
What services does Dr. David R. Marks bill to Medicare?
In 2024, Dr. Marks' most billed Medicare services were care management and other visits (99490), office visit, established patient (99213) and medicare service (G2211).
Show 4 more questionsShow fewer questions
Where did Dr. David R. Marks go to medical school?
Dr. Marks graduated from Yale School of Medicine in 1989.
What drugs does Dr. David R. Marks prescribe most?
In 2024 Medicare Part D data, Dr. Marks' most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
Has Dr. David R. Marks received payments from drug or device companies?
CMS Open Payments shows $5,925 in general payments to Dr. Marks from 33 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. David R. Marks been practicing?
Dr. Marks graduated from medical school in 1989, 37 years ago.
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