Dr. Nick's Walk-In Clinic is Nick Riviera's clinic. Its slogan is, "We Stitch and Don't Snitch."
When Lisa babysat Bart and Maggie, Bart hurt himself seriously and needed medical attention. Lisa was too scared to call Dr. Hibbert so she took her siblings to Dr. Nick. Unfortunately, there was too long queue in the clinic so she decided to take them to the hospital instead.