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Internal MedicineWest Covina, CA

★★★★☆4.1/569 reviews across 4 platforms

Ratings by platform

  • Birdeye: 2.8/5 (16)
  • Healthgrades: 3.7/5 (9)
  • WebMD Care: 5.0/5 (17)
  • WebMD Care: 4.5/5 (27)

What patients say

Patients praise

  • doctors described as thorough, knowledgeable, and empathetic
  • efficient and helpful staff experiences reported for some offices
  • availability of multilingual providers (Spanish, Chinese, Tagalog)
  • comprehensive care for chronic conditions like diabetes and hypertension

Common complaints

  • rude, short-tempered, or unprofessional office staff
  • long wait times and difficulty with appointments
  • perceived lack of thoroughness or empathy in some doctors
  • concerns about administrative processes like prescription renewals

In patients' words

"Dr. Koumas is sweet and attentive. Unfortunately, his intake clerks... are short tempered and rude."

Birdeye

"unprofessional doctor with rude staffs, you will definitely regret"

Healthgrades

"Dr. Kwok gave me a physical, listened to all my issues, prescribed medicine, gave me a referral and before I left the office I had an appointment with a specialist. He was very knowledgeable and I was very impressed."

Vitals

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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