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Dr. Keri Alissa Herzog, MD
NPI1427292614PAC ID7810289022
- Medicare services, 2024
- 368
- Medicare patients, 2024
- 218
- Part D claims, 2024
- 1,016
- Publications
- 5
- Hospital affiliations
- 3
- Practice address
- 687 Main Street, Branford, CT 06405
- Practice phone
- Call (203) 481-0315
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Branford Endoscopy Center
Surgery Center - Medicare-Certified · Branford, Connecticut
Find Dr. Herzog's professional email, personal email and mobile number
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Dr. Keri Alissa Herzog is a gastroenterologist in Branford, Connecticut
Dr. Herzog practices at Branford Endoscopy Center in Branford, Connecticut.
Dr. Herzog's NPI, 1427292614, was assigned on May 1, 2009. Dr. Herzog graduated from New York University Grossman School of Medicine in 2009. Dr. Herzog holds Connecticut license 54855.
NPI and contact details
- NPI
- 1427292614NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7810289022
- NPI enumeration date
- May 1, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (203) 481-0315
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 43
- Medical school graduation
- 2009
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Keri Alissa Herzog practices at Branford Endoscopy Center in Branford, Connecticut
Dr. Herzog's primary practice is Branford Endoscopy Center, at 687 Main Street, Branford, CT 06405. The practice phone is (203) 481-0315.
- Branford Endoscopy Center687 Main Street, Branford, CT 06405Phone(203) 481-0315
Source: Dmand AI Affiliation Data
Dr. Keri Alissa Herzog is affiliated with 6 sites of care and 2 medical groups
Dr. Herzog's primary practice is Branford Endoscopy Center in Branford, Connecticut. Dr. Herzog is also affiliated with Yale New Haven Hospital. The medical group on file is Digestive Disease Associates. Dmand AI also links Dr. Herzog to 2 more hospitals, 2 group practices and clinics and 1 medical group, each named with a free account.
Branford Endoscopy CenterPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Keri Alissa Herzog's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Herzog practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Branford Endoscopy Center | Available with a free account |
| +5 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Keri Alissa Herzog is one of 298 gastroenterologists in Connecticut
Gastroenterology is Dr. Herzog's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Herzog is licensed in Connecticut.
Specialties and state licenses
- Gastroenterology, ConnecticutPrimary
Gastroenterologists near Dr. Herzog
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
298gastroenterologists in Connecticut
6gastroenterologists in Branford
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Keri Alissa Herzog billed Medicare for 368 services in 2024
CMS data shows 368 Medicare services from Dr. Herzog across 8 procedure codes in 2024, for 218 Medicare patients. Medicare paid $40,941 for them.
Medicare services, 2024368
Medicare patients218
Paid by Medicare$40,941
Procedure codes8
Dr. Herzog's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2312024: 2233%
- Surgery
- 2023: 1092024: 14533%
- Tests and treatments
- 2023: 112024: 0100%
Where Dr. Herzog's Medicare services took place, 2024
- In an office22361%
- In a facility14539%
Dr. Herzog compared with the Connecticut median for gastroenterologists, 2024
- Dr. Herzog
- Connecticut median
- Medicare services
- 368vs 361Close to median
- Medicare patients
- 218vs 25314% below
- Part D claims
- 874vs 53862% above
Medians across 284 gastroenterologists in Connecticut with Dmand AI profiles that report each measure.
Dr. Herzog's 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. Herzog and other gastroenterologists in Connecticut.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Keri Alissa Herzog treated 218 Medicare patients in 2024, average age 74
CMS counts 218 Medicare patients who saw Dr. Herzog in 2024. The largest group is 65 to 74, with 91 patients. 75% of them have high cholesterol, and 72% have high blood pressure. 19% 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. Herzog's median patient age at 68, with 78% women.
Medicare patients, 2024218
Average age74
Average risk score1.27
Also on Medicaid19%
Dr. Herzog's Medicare patients by age, 2024
Dr. Herzog's Medicare patients by sex, 2024
- Women17580%
- Men4320%
Chronic conditions among Dr. Herzog's Medicare patients, 2024
- High cholesterol75%
- High blood pressure72%
- Arthritis47%
- Mood disorders33%
- Anxiety31%
- Depression30%
- Osteoporosis28%
- Ischemic heart disease26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Herzog's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women78%
- Men20%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Keri Alissa Herzog wrote 1,016 Medicare Part D claims in 2024
In 2024, Dr. Herzog wrote 1,016 Medicare Part D claims for 370 patients. 84% of them were for generic drugs. CMS names the drug for 874 of them, across 14 drugs with 11 or more claims each, at $187,608 in total drug cost. In 2023, CMS named 803 claims across 14 drugs.
Part D claims, 20241,016
Drugs named by CMS14
Total drug cost$187,608
Part D patients370
Dr. Herzog's Part D claims by kind of drug, 2024
- Generic858 claims84%
- Brand-name and other158 claims16%
Dr. Herzog's 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. Herzog's Part D claims, 2024
- Antibiotics2%24 of 1,016 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: 8032024: 8749%
Drugs named by CMS: 14 in 2024, 14 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
Dr. Keri Alissa Herzog ranks in the 68th percentile for colonoscopy in Medicare
Dr. Herzog accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 61 procedures of colonoscopy by Dr. Herzog, more than 68% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Herzog ranks in Medicare procedure volume
- Colonoscopy
- 68th percentile61 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 62nd percentile46 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Keri Alissa Herzog has 5 publications on record
Dmand AI links 5 papers to Dr. Herzog, published from 2014 to 2022. Dr. Herzog's most frequent co-authors are Arnold J. Markowitz, MD, Moshe Shike, MD and Peter J. Allen, MD.
Papers5
Years published2014 to 2022
Dr. Herzog's papers by year, 2014 to 2022
Dr. Herzog's most frequent co-authors
- Arnold J. Markowitz, MD2 shared papers
- Moshe Shike, MD2 shared papers
- Peter J. Allen, MD1 shared paper
Recent publications by Dr. Herzog
Family PracticeHealth Knowledge, Attitudes, PracticeHepatitis A
Pancreas
DepressionDiabetes MellitusFatigue
See who Dr. Herzog researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Herzog works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Keri Alissa Herzog received $4,534 in industry payments from 2016 to 2025
CMS Open Payments shows 258 general payments to Dr. Herzog from 34 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 95% of the total. Abbvie Inc. paid the most, $1,215.
General payments to Dr. Herzog by program year, 2016 to 2025
General payments to Dr. Herzog by kind, 2016 to 2025
$4.5Kin total
- Food and beverage$4,28595%
- Gifts$2045%
- Education$301%
- Consulting fees$140%
Companies that paid Dr. Herzog 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. Keri Alissa Herzog graduated from New York University Grossman School of Medicine
Dr. Herzog graduated from New York University Grossman School of Medicine in 2009.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Keri Alissa Herzog'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) |
| 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. Keri Alissa Herzog
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. Keri Alissa Herzog's NPI number?
Dr. Keri Alissa Herzog's NPI number is 1427292614. It was assigned on May 1, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Keri Alissa Herzog?
Dr. Keri Alissa Herzog is a gastroenterologist in Branford, Connecticut. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Keri Alissa Herzog practice?
Dr. Herzog practices at 687 Main Street, Branford, CT 06405. Dr. Herzog's primary practice is Branford Endoscopy Center in Branford, Connecticut. Dmand AI also links Dr. Herzog to 2 hospitals, 2 group practices and clinics and 1 medical group.
What is Dr. Keri Alissa Herzog's office phone number?
The practice phone on file for Dr. Herzog is (203) 481-0315.
What is Dr. Keri Alissa Herzog's medical license number?
Dr. Herzog holds Connecticut license 54855.
Which hospitals is Dr. Keri Alissa Herzog affiliated with?
Dr. Herzog is affiliated with Yale New Haven Hospital. Dmand AI links Dr. Herzog to 2 more hospitals.
What medical group is Dr. Keri Alissa Herzog part of?
Dr. Herzog is linked to Digestive Disease Associates. Dmand AI links Dr. Herzog to 1 more medical group.
Does Dr. Keri Alissa Herzog accept Medicare?
Yes. CMS data shows Dr. Herzog billed Medicare for 368 services in 2024, and Dr. Herzog accepts Medicare assignment.
How many Medicare patients does Dr. Keri Alissa Herzog see?
CMS counts 218 Medicare patients who saw Dr. Herzog in 2024, with an average age of 74.
What services does Dr. Keri Alissa Herzog bill to Medicare?
In 2024, Dr. Herzog's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and surgery: digestive system (43239).
Show 6 more questionsShow fewer questions
Where did Dr. Keri Alissa Herzog go to medical school?
Dr. Herzog graduated from New York University Grossman School of Medicine in 2009.
What drugs does Dr. Keri Alissa Herzog prescribe most?
In 2024 Medicare Part D data, Dr. Herzog's most prescribed drugs by claims were Pantoprazole Sodium, Omeprazole and Sod Sulf-Potass Sulf-Mag Sulf.
Has Dr. Keri Alissa Herzog received payments from drug or device companies?
CMS Open Payments shows $4,534 in general payments to Dr. Herzog from 34 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Keri Alissa Herzog been practicing?
Dr. Herzog graduated from medical school in 2009, 17 years ago.
Does Dr. Keri Alissa Herzog do research?
Dmand AI links 5 publications to Dr. Herzog, published from 2014 to 2022.
Who does Dr. Keri Alissa Herzog publish with?
Dr. Herzog's most frequent co-authors are Arnold J. Markowitz, MD (2 shared papers), Moshe Shike, MD (2 shared papers) and Peter J. Allen, MD (1 shared paper).
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