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Gastroenterologists who accept Medicare in Harlingen, TX
CMS lists 14 clinicians in this specialty with a practice address in Harlingen. Accept Medicare assignment (the Medicare-approved amount as full payment): 14. Offer telehealth: 2.
Typical amounts Medicare approves in ZIP 78550 (2024 Medicare rates, the latest CMS has published): a new-patient visit $126, of which you pay about $32; a follow-up visit $97, of which you pay about $24 — 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.
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Order: clinicians who accept assignment first, then by MIPS score (highest first), then by last name.
Allan Coates, DO
✓ Accepts Medicare assignmentMIPS score (2024): 86.4/100Graduated 1980MaleOther offices in Harlingen: 1Drug and device company payments (2025): $224Ingrid M. Chacon, MD
✓ Accepts Medicare assignmentMIPS score (2024): 78.3/100Graduated 1996FemaleDrug and device company payments (2025): $39Wayne D. Green, MD
✓ Accepts Medicare assignmentMIPS score (2024): 75/100✓ TelehealthGraduated 1994MaleDrug and device company payments (2025): $545Nicole M. Grigg Gutierrez, MD
✓ Accepts Medicare assignmentMIPS score (2024): 75/100✓ TelehealthGraduated 2009 · University Central del Caribe Escuela de MedicinaFemaleOther offices in Harlingen: 1Drug and device company payments (2025): $186Nolan E. Perez, MD
✓ Accepts Medicare assignmentMIPS score (2024): 75/100Graduated 1998 · University of Texas Medical School at San AntonioMaleOther offices in Harlingen: 1Drug and device company payments (2025): $40,817Jason R. Phillips, MD
✓ Accepts Medicare assignmentMIPS score (2024): 75/100Graduated 1998 · University of Texas Medical Branch at GalvestonMaleOther offices in Harlingen: 1Drug and device company payments (2025): $223Anthony R. Galan, MD
✓ Accepts Medicare assignmentMIPS score (2024): 61.3/100Graduated 1989MaleOther offices in Harlingen: 1Drug and device company payments (2025): $96Owen S. Maat, MD
✓ Accepts Medicare assignmentMIPS score (2024): 52.3/100Graduated 1992 · University of Texas Medical Branch at GalvestonMaleOther offices in Harlingen: 1Drug and device company payments (2025): $145Oscar A. Alvarez, MD
✓ Accepts Medicare assignmentGraduated 1983MaleOther offices in Harlingen: 1Drug and device company payments (2025): $165Juan J. Castano Jr., MD
✓ Accepts Medicare assignmentGraduated 2013MaleOther offices in Harlingen: 1Drug and device company payments (2025): $53Nghia D. Nguyen, DO
✓ Accepts Medicare assignmentGraduated 2019 · University of North Texas HSC, College of Osteopathic MedMaleBrian P. Rutledge, MD
✓ Accepts Medicare assignmentGraduated 2013 · Wayne State University School of MedicineMaleOther offices in Harlingen: 1Drug and device company payments (2025): $1,862Sandeep T. Samuel, MD
✓ Accepts Medicare assignmentGraduated 2005MaleOther offices in Harlingen: 1Drug and device company payments (2025): $210Mauro Silva, MD
✓ Accepts Medicare assignmentGraduated 2024MaleDrug and device company payments (2025): $308
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 Harlingen
- Primary care doctors130
- Nurse practitioners112
- Cardiologists15
- Dermatologists4
- Orthopedic surgeons8
- Neurologists43
- Ophthalmologists9
- Optometrists11
- Podiatrists10
- Pulmonologists4
- Nephrologists4
- Endocrinologists3
- ENT doctors3
- Oncologists8
- Psychiatrists14
- Psychologists4
- Therapists and counselors16
- Physical therapists25
- Occupational therapists5
- Chiropractors6
- Gynecologists10
- General surgeons12
- Pain management doctors3
- Neurosurgeons4
Other care in Harlingen
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).