SNAP Neuro-Gastrointestinal Clinic

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The SNAP Neuro Gastrointestinal Clinic is a coordinated effort between the divisions of Child Neurology and Pediatric Gastroenterology. The SNAP Neuro-GI Clinic is directed by Drs. Elysa Marco and Sue Rhee. Dr Marco is a child neurologist with training in genetics, cognition and functional imaging, and is active in clinical research in this field. She is joined by Dr. Jessica Litwin, also a cognitive and behavioral child neurologist with an expertise in sleep. This clinic specializes in the assessment of children on and off the autism spectrum with additional challenges with GI conditions such as diarrhea, constipation and cyclical vomiting. Evaluation at our clinic provides investigation into the underlying cause of your child’s neurodevelopmental and gastrointestinal difference as well as behavioral/educational guidance and basic pharmacologic management.


Phone numbers:
Nursing Assistance: (415) 353-2859
New Patient Appointments: (415) 514-5863
PBC main line: 1 (855) PBC-UCSF
Fax: (415) 353-2400

Marin/Greenbrae location
1300 South Eliseo Dr., Suite 204
Greenbrae, California
The parking at the Greenbrae Satellite Clinic is easy. There is parking lot adjacent to the clinical building.
Directions to the Marin Subspecialties Office


At the UCSF Neuro-GI Clinic, each patient goes through a neurological assessment and a separate GI assessment. The initial assessment takes an hour for each assessment and consists of a neurodevelopmental interview and physical examination of your child. The feedback session is 30 minutes and will be scheduled at your convenience in the following 1–2 weeks to answer your questions, discuss diagnosis, next evaluation steps and a treatment plan. The purpose of this neurologic evaluation is to determine the cause or causes of the patient's symptoms and to recommend and manage treatment. In some cases, a diagnosis will be deferred until more information (such as blood tests or brain imaging) is collected. A written report is sent to the primary care physician and/or referring physician on the day of your visit. The GI assessment will be done on the same day if convenient for you and follow-up visits will be coordinated.

**Please note, this clinic does not conduct formal DSM-5 based clinical assessment for the purpose of providing a clinical label. Instead, we focus on finding the underlying cause of the developmental challenge and targeting treatments to the specific individual’s strengths and challenges. We are happy to provide excellent referrals for neuropsychology, autism diagnostics, and psychiatric assessment and treatment as needed.


It is very important to notify your health insurance company of your intention to see us for an evaluation, particularly if you are covered by one of the following plans:

  • San Francisco City Health Plan
  • Medi-Cal Managed Care
  • Brown & Toland/Health Net
  • Pacificare/Secure Horizons
  • Kaiser
  • Blue Shield HMO
  • Marin IPA
  • AltaBates Medical Group
  • Or any other healthcare plan that requires authorization prior to the appointment.

First, call your primary care physician and let them know that you plan to be seen by neurology at UCSF. You can let your insurance carrier or doctor’s office know that the following codes will be used:

First visit: 99245 Comprehensive consultation
<Follow-up visit: 99215 Comprehensive follow-up

All visits must be authorized including follow-up visits. If they are not authorized, you will be charged the balance in full at the time of your visit.

Interpretation Services

Language should not be considered a barrier for patients and their families seeking evaluation. The UCSF Medical Center provides interpreters for medical visits free of charge.