Dr. Mark L. Shiu, DO

Multiple customers report waiting over an hour past scheduled appointment times, and securing new appointments can take several months due to limited weekly availability.

Source: 6 of 8 reviews • Confidence: high (explicit mention)

• Appointment frequency: 1-2 times per week

Several reviewers praise Dr. Shiu as one of the best doctors in the IE and Southern California, describing him as knowledgeable, attentive, and caring.

Source: 2 of 8 reviews • Confidence: medium-high (positive testimonials)

Guests often mention issues such as delayed prescription refills, lack of follow-up calls, difficulty obtaining lab results, and a challenging appointment scheduling system.

Source: 7 of 8 reviews • Confidence: high (recurring theme)

• Prescription delays: common
• Lab result access: problematic

One review noted that for urgent or critical medical needs, the office advises patients to go to urgent care, indicating a perceived lack of immediate support for serious conditions.

Source: 1 of 8 reviews • Confidence: medium (single instance)

One reviewer expressed serious concern that Dr. Shiu increased insulin dosage without proper lab checks, leading to a dangerous low blood sugar event and no follow-up communication, suggesting potential safety issues.

Source: 1 of 8 reviews • Confidence: low (isolated incident)