DR. KARTHIK RAGUNATHAN MD
NPI 1497195457
Internal Medicine - Gastroenterology in Denison, TX

Q: What is Karthik Ragunathan's NPI number?

The NPI number for Karthik Ragunathan is 1497195457. It was assigned to this individual provider in the NPPES registry on July 4, 2013.

Q: What is Karthik Ragunathan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Active since July 04, 2013PECOS EnrolledAccepts Medicare Assignment

5012 S US HIGHWAY 75 STE 250, DENISON, TX 75020(903) 416-6255(903) 416-6257 Get Directions Write a Review

NPPES record last updated: March 6, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Mar 6, 2025, Mar 6, 2023, Mar 9, 2022 and 1 more (4 updates tracked since 2019).

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About Dr. Karthik Ragunathan Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. KARTHIK RAGUNATHAN MD (NPI 1497195457) is an individual gastroenterology provider in Denison, Texas, licensed in Kansas (04-41687) and active in the NPI registry since July 2013. He is enrolled in Medicare PECOS, is affiliated with Texoma Medical Center, and is a graduate of Other (2011).

NPPES Registry Identity

NPI1497195457

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. KARTHIK RAGUNATHANCredential: MD

Location Address5012 S US HIGHWAY 75 STE 250Denison, TX 75020-4587

Mailing Address5012 S Us Highway 75 Ste 250Denison, TX 75020-4587 · (903) 416-6255 · Fax (903) 416-6257

Phone(903) 416-6255

Fax(903) 416-6257

Sole ProprietorNo

Medical School CMSOtherGraduated 2011

Enumeration DateJuly 4, 2013

Last NPPES UpdateMarch 6, 20254 updates tracked since enumeration

NPPES CertifiedMarch 6, 2025

✔ NPI 1497195457 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in KS · 04-41687

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

5012 S US HIGHWAY 75 STE 250, Denison, TX 75020

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas, UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Karthik Ragunathan Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1759693724

PECOS Enrollment IDI20240315003414

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Karthik Ragunathan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Texomacare

0.3 mi

Family Medicine

5012 S US HIGHWAY 75, SUITE 300
Denison, TX 75020

Reassigned Medicare billing, Texas enrollment
66 clinicians in this Medicare group

NPI 1740233592 (903) 416-6015

Texomacare Specialty Physicians

0.3 mi

Cardiovascular Disease

5012 S US HIGHWAY 75, SUITE 100
Denison, TX 75020

Reassigned Medicare billing, Texas enrollment
40 clinicians in this Medicare group

NPI 1548541733 (903) 416-1726

Billings Clinic

1,001 mi

Family Medicine

201 YELLOWSTONE AVE
Cody, WY 82414

Reassigned Medicare billing, Montana enrollment
1,264 clinicians in this Medicare group

NPI 1346288347 (307) 527-7561

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 17

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

207 services97 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

144 services105 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

134 services132 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

110 services108 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

102 services100 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

92 services87 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

86 services51 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

83 services78 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

61 services61 patients

Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm 43249

This procedure involves using a flexible tube with a camera, called an endoscope, to gently expand narrowed areas in your esophagus, stomach, or upper small bowel. A small balloon is inflated, making it easier for food and liquid to pass through. It's safe and effective.

55 services53 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

54 services54 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

43 services38 patients

Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43235

This procedure, known as an upper endoscopy, involves inserting a thin, flexible tube with a camera down the throat to examine the esophagus, stomach, and upper small bowel. It helps diagnose conditions like ulcers or inflammation.

26 services24 patients

Removal of polyps or growths of esophagus, stomach, and/or upper small bowel using an endoscope with mechanical snare 43251

This procedure involves the use of a thin, flexible instrument called an endoscope to visualize and remove abnormal growths, known as polyps, from the esophagus, stomach, or upper small bowel. A tool called a mechanical snare is used to safely cut and remove these growths.

24 services24 patients

Control of bleeding of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43255

This procedure involves using a flexible tube with a light, called an endoscope, to examine and treat bleeding in the esophagus, stomach, or upper small bowel. It's a safe, effective way to control bleeding and ensure your digestive health.

20 services20 patients

Injection beneath lining of large bowel using a flexible endoscope 45381

This procedure involves a flexible tube, called an endoscope, being inserted into the large bowel. A small needle is then passed through the tube to inject medication under the bowel lining. This is typically done to treat inflammation or bleeding.

12 services12 patients

Diagnostic exam of large bowel using a flexible endoscope 45378

This procedure, known as a colonoscopy, involves using a flexible tube with a light and camera to examine the large intestine. It helps detect any abnormalities such as polyps or inflammation. It's a standard procedure to ensure gut health.

11 services11 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Texoma Medical Center

Acute Care Hospitals · Denison, TX

3/5 CMS rating

OwnershipProprietary

CMS Certification Number450324

Location5016 S Us Highway 75Denison, TX 75020 · Grayson County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 75020 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$126.40 typical visit price

range $54.84 – $166.88

Typical copayment $31.60 (range $13.71 – $41.72)

Most-billed visit code 99204

Established Patient

$97.05 typical visit price

range $17.52 – $136.11

Typical copayment $24.26 (range $4.38 – $34.02)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

STACEY L THORNTON M.D.

Obstetrics & Gynecology

5012 S US HIGHWAY 75 STE 250
DENISON, TX 75020

Grayson County (903) 416-6430

JESSICA REESE FNP

Nurse Practitioner (Family)

5012 S US HIGHWAY 75 STE 250
DENISON, TX 75020

Grayson County (903) 416-6430

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Karthik Ragunathan's NPI number?

The NPI number for Karthik Ragunathan is 1497195457. It was assigned to this individual provider in the NPPES registry on July 4, 2013.

Where is Karthik Ragunathan located?

Karthik Ragunathan practices at 5012 S Us Highway 75 Ste 250, Denison, TX 75020. The listed phone number is (903) 416-6255.

What is Karthik Ragunathan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Karthik Ragunathan enrolled in Medicare?

Yes. Karthik Ragunathan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Karthik Ragunathan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Karthik Ragunathan reassigns Medicare benefits to 3 organizations: Texomacare (Denison, TX), Texomacare Specialty Physicians (Denison, TX) and Billings Clinic (Cody, WY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Karthik Ragunathan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Karthik Ragunathan accept?

Health plans from Blue Cross and Blue Shield of Texas and UnitedHealthcare list Karthik Ragunathan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Karthik Ragunathan affiliated with any hospitals?

According to CMS data, Karthik Ragunathan is affiliated with Texoma Medical Center.

When was this NPI record last updated?

The NPPES record for Karthik Ragunathan was last updated on March 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.