Stoni Johnston
Psychiatric Mental Health Nurse Practitioner / Co-owner
APRNMSNPMHNP-BC
Autism Diagnosis & Assessment
Sulcata Psychiatry
Center-based in Tomball, TX
4.8(132 Google reviews)
Accepting new clientsTelehealthCenter-based
Contact this providerFree for families · no spam
Ages served
3+ (evaluations); 6+ (medication management and most services)
Availability
Accepting new clients
Setting
Center-based · Telehealth
Languages
English
Overview
Autism Diagnosis & Assessment in Tomball
Tucked into north Houston's Tomball and Cypress corridors, Sulcata Psychiatry was built from the ground up by a board-certified psychiatric nurse practitioner and a licensed clinical social worker — two clinicians who wanted evaluation and ongoing care under one roof. The practice covers medication management, psychotherapy, pharmacogenetic testing, vitamin replacement, and both ADHD and autism-spectrum evaluations using the ADOS-2. Children as young as 3 can be seen for evaluations; most other services open at age 6.
Best for
North Houston families who want one practice to handle autism or ADHD testing and then stay on for medication management or therapy — without bouncing between separate offices — for children and adolescents 6 and up.
Their approach
Rather than treating a prescription as the endpoint, the team layers in therapy, dietary guidance, and ancillary interventions alongside any medication, drawing patients and families into the planning conversation at every step.
What to expect
ADHD medication management requires a completed ADHD evaluation at least 24 hours before the first intake visit; autism and academic testing runs a minimum three hours in person, with a full written report back in four to six weeks. Bookings are available online or by phone, and telehealth covers medication management and therapy sessions.
Services
Services & specialties
- Age Range
- 3+
- Deliverables
- Full written report
- Optional 504/IEP accommodation report
- Evaluator Types
- PMHNP-BCM.Ed. Diagnostician
- Telehealth Eval
- No
- Assessment Tools
- ADOS-2QBTest (ADHD CPT)Woodcock-JohnsonCTOPPGORT-5
- Scope Of Testing
- ADHDAutism Spectrum DisorderLearning disordersDyslexiaDyscalculiaDysgraphiaIQ/intellectual disabilitiesAcademic achievement
The people
Meet the Sulcata Psychiatry team
Jamillah Elvehoey
Psychiatric Mental Health Nurse Practitioner
APRNMSNPMHNP-BC
Jamillah Elvehoey holds board certification as a PMHNP (APRN, MSN, PMHNP-BC) and sees children, adolescents, and adults for psychiatric mental health care at Sulcata Psychiatry.Read more
Ashley Graham
Psychiatric Mental Health Nurse Practitioner
APRNMSNPMHNP-BC
A board-certified PMHNP (APRN, MSN, PMHNP-BC), Ashley Graham brings psychiatric evaluation and medication management to pediatric, teen, and adult patients at the practice.Read more
Payal Patel
Psychiatric Mental Health Nurse Practitioner
APRNMSNPMHNP-BC
Payal Patel is a board-certified PMHNP (APRN, MSN, PMHNP-BC) who works with children, adolescents, and adults seeking psychiatric mental health support at Sulcata Psychiatry.Read more
Allyson Mercer
Psychiatric Mental Health Nurse Practitioner
APRNMSNPMHNP-BC
Holding board certification as a PMHNP (APRN, MSN, PMHNP-BC), Allyson Mercer provides psychiatric mental health care to patients across the pediatric, adolescent, and adult age ranges.Read more
Angela Calkins
Diagnostician / Life Coach
M.Ed.Certified Life Coach
Angela Calkins (M.Ed.) is a masters-prepared special education diagnostician who conducts autism (ADOS-2), academic, and achievement evaluations — including Woodcock-Johnson, CTOPP, and GORT-5 — for ages 3 and up, and is also a certified life coach focused on behavioral support.Read more
Hailey Graham
Licensed Clinical Social Worker / Therapist
LCSWEMDR
An LCSW certified in EMDR, Hailey Graham specializes in adolescent mental health, treating depression, anxiety, trauma, and personality disorders through individual and family therapy using both EMDR and DBT modalities.Read more
Jessica Howell
Licensed Master Social Worker / Therapist
LMSW
Jessica Howell (LMSW) delivers individual therapy to children, adolescents, and adults presenting with a wide range of diagnoses at Sulcata Psychiatry.Read more
Hours
- Mon
- 9AM–5PM
- Tue
- 9AM–5PM
- Wed
- 9AM–5PM
- Thu
- 9AM–5PM
- Fri
- 9AM–1PM
- Sat
- Closed
- Sun
- Closed
Reputation
What families say about Sulcata Psychiatry
4.8
132 reviews
Positive reviews95%
5-star reviews94%
Ratings and reviews sourced from Google.
Good to know
Common questions about Sulcata Psychiatry
What does an autism evaluation at Sulcata Psychiatry involve?
Evaluations can include ADOS-2, QBTest (ADHD CPT), Woodcock-Johnson, CTOPP and GORT-5, tailored to your child. The goal is a clear picture of your child's strengths and needs, not just a yes-or-no answer.
Will I receive a report I can share with my child's school?
Yes — Sulcata Psychiatry provides a formal written evaluation report for your child's school and care team. That documentation can support IEP or 504 requests at school.
What ages does Sulcata Psychiatry serve?
Sulcata Psychiatry serves ages 3+ (evaluations); 6+ (medication management and most services). If your child is near the edge of that range, it's worth reaching out — providers often make case-by-case decisions.
Does Sulcata Psychiatry offer telehealth?
Yes — Sulcata Psychiatry offers telehealth in addition to in-person care for families across Texas, where clinically appropriate. It can be a practical option for follow-ups or for families a long drive from the clinic.
Where is Sulcata Psychiatry located?
Sulcata Psychiatry is located at 12075 Spring Cypress Rd Suite D, Tomball, TX 77377, serving families throughout Tomball and the surrounding area. If getting there is difficult, ask whether telehealth or in-home options are available.
Is Sulcata Psychiatry accepting new clients?
Sulcata Psychiatry is currently accepting new clients in Tomball. Sharing your child's age and insurance up front helps them tell you quickly whether they're a fit — availability can change fast.
Ratings sourced from Google. Autism Services Finder verifies listings but doesn’t endorse providers. Updated July 2026.
12075 Spring Cypress Rd Suite D, Tomball, TX 77377
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