Dig Dis Sci
AdenomaColonic PolypsColonoscopy
Dr. Karthik Ragunathan, MD
NPI1497195457PAC ID1759693724
- Medicare services, 2024
- 1,264
- Medicare patients, 2024
- 377
- Part D claims, 2024
- 298
- Publications
- 7
- Hospital affiliations
- 2
- Practice address
- 5016 S Us Highway 75, Denison, TX 75020
- Practice phone
- Call (903) 416-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Ragunathan's 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. Karthik Ragunathan is a gastroenterologist in Denison, Texas
Dr. Ragunathan practices at Texoma Medical Center in Denison, Texas, part of Universal Health Services.
Dr. Ragunathan's NPI, 1497195457, was assigned on July 4, 2013. Dr. Ragunathan holds Kansas license 04-41687.
NPI and contact details
- NPI
- 1497195457NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1759693724
- NPI enumeration date
- July 4, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (903) 416-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Karthik Ragunathan practices at Texoma Medical Center in Denison, Texas
Dr. Ragunathan's primary practice is Texoma Medical Center, at 5016 S Us Highway 75, Denison, TX 75020 in Grayson County. The practice phone is (903) 416-4000.
- Texoma Medical Center5016 S Us Highway 75, Denison, TX 75020 · Grayson CountyPhone(903) 416-4000
Source: Dmand AI Affiliation Data
Dr. Karthik Ragunathan is affiliated with 4 sites of care and 3 medical groups
Dr. Ragunathan's primary practice is Texoma Medical Center in Denison, Texas, part of Universal Health Services. Dr. Ragunathan is also affiliated with TMC Bonham Hospital. The medical group on file is TexomaCare. Dmand AI also links Dr. Ragunathan to 2 more group practices and clinics and 2 medical groups, each named with a free account.
TMC Bonham HospitalTexomaCare2 group practices and clinicsNames with a free account2 medical groupsNames with a free account
See all 7 affiliations for Dr. RagunathanSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Karthik Ragunathan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ragunathan practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Texoma Medical Center | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Karthik Ragunathan is one of 1,341 gastroenterologists in Texas
Gastroenterology is Dr. Ragunathan's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Ragunathan is licensed in Kansas.
Specialties and state licenses
- Gastroenterology, KansasPrimary
Gastroenterologists near Dr. Ragunathan
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
1,341gastroenterologists in Texas
4gastroenterologists in Denison
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Karthik Ragunathan billed Medicare for 1,264 services in 2024
CMS data shows 1,264 Medicare services from Dr. Ragunathan across 17 procedure codes in 2024, for 377 Medicare patients. Medicare paid $108,425 for them.
Medicare services, 20241,264
Medicare patients377
Paid by Medicare$108,425
Procedure codes17
Dr. Ragunathan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2862024: 770169%
- Surgery
- 2023: 8952024: 49445%
- Other services
- 2023: 262024: 0100%
Where Dr. Ragunathan's Medicare services took place, 2024
- In an office30224%
- In a facility96276%
Dr. Ragunathan compared with the Texas median for gastroenterologists, 2024
- Dr. Ragunathan
- Texas median
- Medicare services
- 1,264vs 5052.5 times
- Medicare patients
- 377vs 28433% above
- Part D claims
- 220vs 49355% below
Medians across 1,281 gastroenterologists in Texas with Dmand AI profiles that report each measure.
Dr. Ragunathan'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.
Need commercial claims for Dr. Ragunathan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ragunathan and other gastroenterologists in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Karthik Ragunathan treated 377 Medicare patients in 2024, average age 74
CMS counts 377 Medicare patients who saw Dr. Ragunathan in 2024. The largest group is 65 to 74, with 167 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 10% are also on Medicaid. Their average risk score is 1.65, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Ragunathan's median patient age at 70, with 49% women.
Medicare patients, 2024377
Average age74
Average risk score1.65
Also on Medicaid10%
Dr. Ragunathan's Medicare patients by age, 2024
Dr. Ragunathan's Medicare patients by sex, 2024
- Women20454%
- Men17346%
Chronic conditions among Dr. Ragunathan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis55%
- Ischemic heart disease45%
- COPD38%
- Chronic kidney disease35%
- Diabetes35%
- Anxiety34%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ragunathan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women49%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Karthik Ragunathan wrote 298 Medicare Part D claims in 2024
In 2024, Dr. Ragunathan wrote 298 Medicare Part D claims for 180 patients. 84% of them were for generic drugs. CMS names the drug for 220 of them, across 6 drugs with 11 or more claims each, at $6,628 in total drug cost. In 2023, CMS named 559 claims across 7 drugs.
Part D claims, 2024298
Drugs named by CMS6
Total drug cost$6,628
Part D patients180
Dr. Ragunathan's Part D claims by kind of drug, 2024
- Generic249 claims84%
- Brand-name49 claims16%
Dr. Ragunathan'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 5592024: 22061%
Drugs named by CMS: 6 in 2024, 7 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. Karthik Ragunathan ranks in the 98th percentile for upper gastrointestinal (gi) endoscopy for acid reflux in Medicare
Dr. Ragunathan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 446 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Ragunathan, more than 98% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Ragunathan ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 98th percentile446 procedures
- Colonoscopy
- 90th percentile164 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. Karthik Ragunathan has 7 publications on record
Dmand AI links 7 papers to Dr. Ragunathan, published from 2013 to 2021. 2014 was the busiest year, with 2. The most frequent topics are Barrett Esophagus. Dr. Ragunathan's most frequent co-authors are Siddharth Singh, MBBS, Zohair Ahmed, MD and Prabhleen Chahal, MD.
Papers7
Years published2013 to 2021
Dr. Ragunathan's papers by year, 2013 to 2021
Topics Dr. Ragunathan writes about most
- Barrett Esophagus
Dr. Ragunathan's most frequent co-authors
- Siddharth Singh, MBBS2 shared papers
- Zohair Ahmed, MD1 shared paper
- Prabhleen Chahal, MD1 shared paper
Recent publications by Dr. Ragunathan
Clin Gastroenterol Hepatol
Barrett EsophagusDisease ProgressionSmoking
J Community Hosp Intern Med Perspect
Gastrointest Endosc
AdenocarcinomaArgon Plasma CoagulationBarrett Esophagus
See who Dr. Ragunathan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ragunathan 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. Karthik Ragunathan received $2,058 in industry payments from 2017 to 2025
CMS Open Payments shows 24 general payments to Dr. Ragunathan from 9 drug and device companies from 2017 to 2025. Travel and lodging make up the largest share, 69% of the total. Olympus Corporation of the Americas paid the most, $1,162.
General payments to Dr. Ragunathan by program year, 2017 to 2025
General payments to Dr. Ragunathan by kind, 2017 to 2025
$2.1Kin total
- Travel and lodging$1,41969%
- Food and beverage$63931%
Companies that paid Dr. Ragunathan 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. Karthik Ragunathan'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) |
| 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. Karthik Ragunathan
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. Karthik Ragunathan's NPI number?
Dr. Karthik Ragunathan's NPI number is 1497195457. It was assigned on July 4, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. Karthik Ragunathan?
Dr. Karthik Ragunathan is a gastroenterologist in Denison, Texas. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Karthik Ragunathan practice?
Dr. Ragunathan practices at 5016 S Us Highway 75, Denison, TX 75020. Dr. Ragunathan's primary practice is Texoma Medical Center in Denison, Texas, part of Universal Health Services. Dmand AI also links Dr. Ragunathan to 2 group practices and clinics and 2 medical groups.
What is Dr. Karthik Ragunathan's office phone number?
The practice phone on file for Dr. Ragunathan is (903) 416-4000.
What is Dr. Karthik Ragunathan's medical license number?
Dr. Ragunathan holds Kansas license 04-41687.
Which hospitals is Dr. Karthik Ragunathan affiliated with?
Dr. Ragunathan practices at Texoma Medical Center in Denison, Texas. Dr. Ragunathan is also affiliated with TMC Bonham Hospital.
What medical group is Dr. Karthik Ragunathan part of?
Dr. Ragunathan is linked to TexomaCare. Dmand AI links Dr. Ragunathan to 2 more medical groups.
Does Dr. Karthik Ragunathan accept Medicare?
Yes. CMS data shows Dr. Ragunathan billed Medicare for 1,264 services in 2024, and Dr. Ragunathan accepts Medicare assignment.
How many Medicare patients does Dr. Karthik Ragunathan see?
CMS counts 377 Medicare patients who saw Dr. Ragunathan in 2024, with an average age of 74.
What services does Dr. Karthik Ragunathan bill to Medicare?
In 2024, Dr. Ragunathan's most billed Medicare services were hospital inpatient care (99232), office visit, established patient (99214) and surgery: digestive system (43239).
Show 5 more questionsShow fewer questions
What drugs does Dr. Karthik Ragunathan prescribe most?
In 2024 Medicare Part D data, Dr. Ragunathan's most prescribed drugs by claims were Omeprazole, Pantoprazole Sodium and Suflave.
Has Dr. Karthik Ragunathan received payments from drug or device companies?
CMS Open Payments shows $2,058 in general payments to Dr. Ragunathan from 9 companies from 2017 to 2025. The largest total came from Olympus Corporation of the Americas.
How long has Dr. Karthik Ragunathan been practicing?
Dr. Ragunathan graduated from medical school in 2011, 15 years ago.
Does Dr. Karthik Ragunathan do research?
Dmand AI links 7 publications to Dr. Ragunathan, published from 2013 to 2021.
Who does Dr. Karthik Ragunathan publish with?
Dr. Ragunathan's most frequent co-authors are Siddharth Singh, MBBS (2 shared papers), Zohair Ahmed, MD (1 shared paper) and Prabhleen Chahal, MD (1 shared paper).
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