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Peninsula Gastrointestinal Specialists: Gastroenterologist San ...

GastroenterologySan Simeon, CA

★★★★☆4.2/552 reviews across 5 platforms

Ratings by platform

  • Birdeye: 3.4/5 stars (14 reviews)
  • Birdeye: 4.8/5 stars (30 reviews (at time of source access))
  • Yelp: 1.5/5 stars (2 reviews)
  • WebMD Care: 4/5 stars (Dr. Onuma) (5 reviews)
  • WebMD Care: 5/5 stars (Dr. Lee) (1 review (Dr. Lee))

What patients say

Patients praise

  • Professional and experienced physicians
  • Kind, patient, and supportive staff members
  • Thorough exams and clear explanations of conditions
  • Clean and efficient office environment

Common complaints

  • Billing and insurance processing concerns
  • Appointment scheduling issues
  • Negative feedback regarding physician bedside manner in isolated instances

In patients' words

"Dr. Onuma and Nancy are professional, kind, patient, supportive, and caring. My office visits are always such a wonderful experience. They are welcoming, there is no wait time, appointments start promptly, and scheduling is trouble free. Dr. Onuma and Nancy provide outstanding and world-class service."

WebMD Care Patient Review

"Doctor Onuma seems to do a good job; the problem is the billing department. I just received a bill for nearly $300 for a procedure performed ten months ago."

Yelp Review

How these reviews were compiled

Synthesized from public patient-review platforms as of Jul 10, 2026 — sources: [1][2][3][4][5][6][7][8].

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