Home › Doctors › Colorado › Castle Rock › Gastroenterologists
Gastroenterologists who accept Medicare in Castle Rock, CO
CMS lists 26 clinicians in this specialty with a practice address in Castle Rock. Accept Medicare assignment (the Medicare-approved amount as full payment): 26. Offer telehealth: 9.
Typical amounts Medicare approves in ZIP 80104 (2024 Medicare rates, the latest CMS has published): a new-patient visit $133, of which you pay about $33; a follow-up visit $102, of which you pay about $26 — the 20% coinsurance after the yearly Part B deductible. Clinicians who don't accept assignment can charge up to 15% more; with a Medicare Advantage plan, your plan's copay applies instead.
Is this your organization or practice? Feature it at the top of this page — $49 for 30 days →
Order: clinicians who accept assignment first, then by MIPS score (highest first), then by last name.
Karin B. Cesario, MD
✓ Accepts Medicare assignmentMIPS score (2024): 96.7/100Graduated 1997 · University of Colorado School of Medicine, DenverFemaleDrug and device company payments (2025): $881Daniel E. Hogan Jr., DO
✓ Accepts Medicare assignmentMIPS score (2024): 90.4/100Graduated 2016 · At Still Un of Hlth Sciences, Col of Osteo Med, MesaMaleDrug and device company payments (2025): $593Pujyitha Mandiga, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.3/100Graduated 2018FemaleOther offices in Castle Rock: 3Ryan R. McWilliams, MD
✓ Accepts Medicare assignmentMIPS score (2024): 86/100Graduated 2008 · University of Colorado School of Medicine, DenverMaleOther offices in Castle Rock: 2Drug and device company payments (2025): $633Thomas C. Welton, MD
✓ Accepts Medicare assignmentMIPS score (2024): 86/100Graduated 1988 · Kansas City College of Medicine and SurgeryMaleOther offices in Castle Rock: 5Drug and device company payments (2025): $192Christopher J. Calcagno, DO
✓ Accepts Medicare assignmentGraduated 2008 · Philadelphia College of Osteopathic MedicineMaleDrug and device company payments (2025): $282Carlene L. Chun, MD
✓ Accepts Medicare assignmentGraduated 2012 · Stanford University School of MedicineFemaleOther offices in Castle Rock: 2Drug and device company payments (2025): $1,352Paula M. Dionisio, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2003 · Georgetown University School of MedicineFemaleDrug and device company payments (2025): $15Daniel J. Freese, DO
✓ Accepts Medicare assignment✓ TelehealthGraduated 1998 · New York College of Osteo Medicine of New York Institute of TechnologyMaleHazem T. Hammad, MD
✓ Accepts Medicare assignmentGraduated 2004MaleChristopher M. Haydek, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2017 · Loyola University of Chicago, Stritch School of MedicineMaleDrug and device company payments (2025): $107,740Nuzhat Iqbal, MD
✓ Accepts Medicare assignmentGraduated 1991FemaleAnkush Kalra, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2013 · Wright State University Boonshoft School of MedicineMaleDrug and device company payments (2025): $1,338Mandip Kc, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2013 · University of Colorado School of Medicine, DenverMaleDrug and device company payments (2025): $1,996Prashant Krishnan, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2003 · Louisiana State University School of Medicine in New OrleansMaleDrug and device company payments (2025): $795Michael J. Nosler, MD
✓ Accepts Medicare assignmentGraduated 2001 · Creighton University School of MedicineMaleDrug and device company payments (2025): $127Bhaktasharan C. Patel, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 1984MaleDrug and device company payments (2025): $2,372Lirio S. Polintan, MD
✓ Accepts Medicare assignmentGraduated 1973MaleNipun B. Reddy, MD
✓ Accepts Medicare assignmentGraduated 2007 · University of Alabama School of MedicineMaleOther offices in Castle Rock: 2James E. Rose, MD
✓ Accepts Medicare assignmentGraduated 1998MaleDrug and device company payments (2025): $1,456Kevin M. Rufner, MD
✓ Accepts Medicare assignmentGraduated 2006 · Tufts University School of MedicineMaleOther offices in Castle Rock: 5Drug and device company payments (2025): $940Rajiv N. Singh, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2018MaleDrug and device company payments (2025): $143Christopher Stauch, MD
✓ Accepts Medicare assignmentGraduated 2008 · Uniformed Services Uhs Fe Hebert School of MedMaleDrug and device company payments (2025): $19Herman Suga, DO
✓ Accepts Medicare assignmentGraduated 2018 · Campbell Univ School of Osteopathic MedicineMaleDrug and device company payments (2025): $2,154Brenda C. Westhoff, DO
✓ Accepts Medicare assignment✓ TelehealthGraduated 2000FemaleSung K. Yang, MD
✓ Accepts Medicare assignmentGraduated 1986 · Loyola University of Chicago, Stritch School of MedicineMaleDrug and device company payments (2025): $92
Before you book
This list comes from Medicare's enrollment records, not from reviews. Call the office to confirm the clinician is taking new Medicare patients. With Original Medicare, a clinician who accepts assignment can only charge you the Medicare deductible and coinsurance; one who doesn't may charge up to 15% more than the Medicare-approved amount. If you have a Medicare Advantage plan, check that the clinician is in the plan's network.
The MIPS final score (0–100) comes from Medicare's Merit-based Incentive Payment System for 2024. It combines quality measures, cost, improvement activities and use of certified health records, and it sets a payment adjustment. Clinicians who report as a group share the group's score. It is not a patient rating, and many clinicians have no published score.
Payments from drug and medical device companies come from CMS Open Payments (2025 general payments: meals, travel, consulting and speaking fees, gifts and similar), summed for each clinician. Receiving payments is legal and common and does not mean a clinician did anything wrong.
Other specialists in Castle Rock
- Primary care doctors190
- Nurse practitioners181
- Cardiologists55
- Dermatologists9
- Orthopedic surgeons29
- Neurologists24
- Ophthalmologists4
- Optometrists19
- Podiatrists8
- Urologists21
- Pulmonologists9
- Nephrologists4
- Endocrinologists6
- Rheumatologists6
- ENT doctors13
- Oncologists13
- Psychiatrists10
- Psychologists6
- Therapists and counselors76
- Physical therapists69
- Occupational therapists15
- Speech therapists6
- Audiologists6
- Chiropractors10
- Gynecologists44
- General surgeons44
- Vascular surgeons10
- Physiatrists10
- Allergists4
- Neurosurgeons11
- Infectious disease doctors3
Other care in Castle Rock
Hospitals · Nursing homes · Dialysis centers · Home health agencies · Hospices
Nearby cities
Enrollment, addresses and scores are as reported to CMS and can change. This is not a list of in-network providers for any Medicare Advantage plan, and it is not medical advice. Source: CMS Provider Data Catalog — Doctors and Clinicians National Downloadable File, Clinician MIPS Performance 2024 and Facility Affiliation Data (released Oct 2, 2026).