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Big river

Psychological/ Neuropsych Testing  &

Psychiatric Medication Evaluations

To be added to the waitlist, use the Contact Us form below



Estimated current Wait times for Dr. Nixon:  (Neuropsych Evals):

Private Insurances: 5 months

Medicaid: 12 months

Private Pay: 2 months 

EXPRESS Pay: within 3 weeks

ADOS only testing (ages <4): 3-4 months

Estimated current Wait times for Dr. Zaluski (Psychiatric Evaluations and Medication Management):

Current openings available!

 **PLEASE NOTE:   Big River Psychology does not have an onsite receptionist/waiting room.

Please do not show up to the clinic without an appointment. If contacting via phone, kindly leave a voicemail or text, as we are often with patients during daytime hours.

We will contact you within 2 weeks of receiving your referral.

Once you are near the top of the waitlist, you will be called and sent an invite to complete documentation through the Electronic Health Portal(Charm).

Thank you for your patience. 

We are excited to work with you and your child!

Child Psycholgist

Psychological Services

Big River Psychology is a children’s mental health clinic specializing in neuropsychological and psychological testing,  Autism evaluations, individual therapy, and consultation services.

Dr. Heather Zaluski  is a child psychiatrist offering Psychiatric Medication Evaluations.


Dr. Nixon and Dr. Zaluski provide evidenced based interventions to help you learn more about your child’s strengths, weaknesses, and treatment needs.

Neuropsychological Testing

Neuropsychological and psychological testing is an evaluation by a licensed psychologist which helps patients and/or families understand the relationship between brain functions, emotions, and behaviors. These types of testing can assist in the diagnosis, symptom monitoring, and treatment of neurological, medical, and psychiatric conditions.

A psychologist will use a variety of assessment sources to answer the referral question/s including review of previous testing data, patient interviews, interviews with parents/providers, self-report questionnaires as well as various standardized psychological tests that assess a wide range of domains. A combination of neuropsychological tests and psychological tests can assess domains such as intelligence, memory, executive functioning, learning delays, language, visual motor integration, developmental delays, emotional functioning, and personality traits.

Neurodevelopmental Testing/Autism Evaluation

A neurodevelopmental evaluation may be beneficial in assessing for signs of Autism Spectrum Disorder or if a young child is not meeting specific developmental benchmarks. Many healthcare providers may cite the term “ADOS” testing which is often included in this type of evaluation, although other measures may be used to assess for Autism Spectrum Disorder. Additional diagnostic rule outs may include an intellectual delay and/or environmental factors that could be impacting a child’s development.

Individual Therapy/Parent Consultation

Dr. Nixon specializes in the treatment of anxiety-based disorders such as Obsessive Compulsive Disorder, Phobias, and Panic Disorder. Dr. Nixon uses evidence based modalities such as Cognitive Behavioral Therapy (CBT), Dialectical Behavioral Therapy (DBT) and Exposure with Response Prevention (ERP) to target symptoms of anxiety. Dr. Nixon also offers treatment of tic disorders using habit-reversal training.

Dr. Nixon provides consultation and parent training for those parents who are trying to help develop better strategies for their child diagnosed with ADHD and/or Autism. This service is focused on behavioral training for parents such as development of token economy systems, implementation of routines and expectations within the homes setting, and lifestyle changes to support your child and the family system.

Consultation Services 

Formal supervision/consultation services are offered on a case-by-case basis. Please use the Contact Us form at for a free initial consultation to discuss your supervision/consultation needs.


Trainings are also offered on a case-by-case basis. Dr. Nixon & Dr. Zaluski have offered trainings tailored to medical staff, mental health providers, organizations, and community members. Please use the Contact Us form at for a free initial consultation to discuss your training needs.

Psychiatric Evaluation and Medication Management

Dr.  Zaluski is a board certified child psychiatrist and offers comprehensive psychiatric diagnostic evaluations and medication management.  Dr. Zaluski is qualified to diagnose a variety of childhood mental health conditions, including ADHD, mood disorders, anxiety disorders, trauma related disorders, and autism.  Components of the evaluation include gathering history, speaking with parents/ guardians, reviewing records from other clinicians, obtaining data from standardized measures, and meeting with the child for a thorough mental status exam.  After the evaluation is complete, Dr. Zaluski will initiate medication management and conduct ongoing appointments with the patient until stabilization has been reached. This process varies depending on the complexity of the case, but typically takes around 2 - 4 months.  At this point, it is expected that the patient will transfer back under the care of the primary care provider who will carry on the medication regimen. Your primary care provider will receive a detailed report, and Dr. Zaluski will collaborate directly with them to ensure that the child is getting the best possible treatment.  This process allows Dr. Zaluski to evaluate and treat more patients across Montana. 

Current Patients

You can access the portal account you created below to review forms, check appointments, and login to telehealth appointments

Dr. Nixon

Dr. Hannah Nixon

Psy.D., M.P.-Medical Psychologist

Dr. Hannah Nixon is a licensed psychologist who specializes in the evaluation and treatment of neurodevelopment disorders in children and adolescents. She completed her undergraduate degree at Carroll College before pursuing a doctoral degree at Pacific University. Dr. Nixon then went on to complete a Master’s degree in psychopharmacological training at New Mexico State University which allows her to prescribe medications for psychiatric conditions in select states (not currently a Montana privilege for psychologists). This training allows greater knowledge in the assessment and treatment of psychiatric conditions and their interplay with physiological diagnoses. Dr. Nixon uses this training to assign recommendations and consult with your primary care provider to support your child’s well-being. 

Dr. Nixon specializes in the assessment of a full spectrum of mental health disorders including ADHD, Autism, learning delays, developmental delays, anxiety, mood disorders, behavioral issues, and trauma-related disorders.  She also offers treatment for anxiety-based disorder (OCD, Panic Disorder, Phobias) using CBT, DBT, Exposure with Response Prevention, as well as parent training. Dr. Nixon has extensive training working with children and their families in a variety of settings such as private practice, community-based services, and residential services.


In her free time, Dr. Nixon enjoys spending time with her family, cycling, hiking, travelling, watching basketball, and eating tacos.


Dr. Heather Zaluski

MD., MA-Child Psychiatrist

Dr. Heather Zaluski is a Board Certified Child Psychiatrist who specializes in the evaluation and treatment of complex mental health disorders in children and adolescents.  Dr. Zaluski attended Medical School at Michigan State University’s College of Human Medicine and graduated with Honors in 2002.  She completed her 5 year residency and fellowship program at University of North Carolina in Chapel Hill, and then moved to Montana with her family.  Dr. Zaluski worked at Shodair Children’s Hospital for 15 years, worked in the Acute, Residential and Outpatient settings, and was the Medical Director from December 2019 - July 2022. 


Currently, Dr. Zaluski is in private practice and her professional focus is on providing clinical consultations for complex cases.  She also authors continuing education content, supervises psychiatric nurse practitioners, provides expert witness testimony, and collaborates with primary care providers.


In her free time, Dr. Zaluski enjoys travel, spending time with her husband and children, yoga, snorkeling and scuba diving, cooking, birding, rock hounding and quilting. 

Meet the Team

Payment Sources


Medicaid & HMK+






Healthy Montana Kids




Private Pay

Please note "Private Pay" in your contact form. *Most Private Pay slots for Neuropsychological testing are less than a 3 month wait

Private Pay Testing Rates

 Neuropsychological Evaluation: $2,500

IQ only/gifted testing: $800

Autism "ADOS" only testing (ages <5): $1,200

Dr. Zaluski:  Psychiatric Evaluation and Medication management:  Initial visit $450, follow up visits $300 - $325.  


Private Pay

If rushed testing is needed, private pay patients can request express testing for an additional fee. Because Big River Psychology will not displace patients already on the waitlist, express cases may be requested to participate in evaluation services outside typical office hours or on weekends. You will be offered an intake within 3 weeks for EXPRESS testing/services. Please note "EXPRESS" in your contact form.

EXPRESS Neuropsych Evaluation: $3,500

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