Autism Testing and Evaluation on Seattle's Eastside: Where to Actually Go

If you’re searching for autism testing on Seattle’s Eastside (Issaquah, Bellevue, Redmond, Sammamish), you’ve probably already found that most clinic websites answer everything except the two questions you actually have: who can give my child a real diagnosis, and how long will I wait.

Current as of August 2026.

Orchid Academy does not diagnose autism. We’re an ABA provider, and like most ABA providers, we can’t begin services until someone else has completed a diagnostic evaluation. We send families to the places below constantly, so we’ve put the list in one place.

Do this first, before you finish reading

Get on a waitlist today, before you finish researching every option.

Diagnostic waits on the Eastside run months. You can join more than one waitlist at a time, and you can leave a list later at no cost to anyone. Pick the most likely option below, start it, then keep reading.

If your child is under 3, start with ESIT

Children under 3 in Washington can get a free comprehensive developmental evaluation and begin services through Early Support for Infants and Toddlers (ESIT), without a diagnosis and without waiting for one.

Kindering: 16120 NE 8th St, Bellevue. Intake (425) 653-4300, main (425) 747-4004. Serves birth to 3 across King and Snohomish counties. Evaluations are comprehensive, a formal diagnosis is not required, and children are served regardless of a family’s ability to pay or insurance coverage. Sliding scale where fees apply.

Encompass Northwest: (425) 888-3347. Serves Duvall, Carnation, Snoqualmie, North Bend, and parts of Sammamish and Issaquah. Birth-to-three ESIT services in the home, plus therapy services up to age 10. Accepts Apple Health and private insurance; scholarships available.

Eligibility for ESIT generally means a documented delay of about 25% in one or more developmental areas. Speech, motor, cognitive, social-emotional, and self-help all count.

Do this in parallel with pursuing a diagnosis, not instead of it. Your child gets support in the meantime, and the evaluation records become useful documentation later.

The main diagnostic routes

Seattle Children’s Autism Center: Magnuson Clinic, Seattle

Ages 15 months to 21 years. Requires a referral from your child’s primary care provider. Phone 206-987-8080.

Seattle Children’s is candid that the wait is long. Two things worth doing when you call: confirm they actually received the referral (referrals get lost more often than anyone likes), and ask to be added to the cancellation list. That list is the closest thing to a shortcut that exists here.

Seattle Children’s Federal Way Clinic: newest option, ages 5–12

Since late March 2026, Seattle Children’s has offered autism diagnostic evaluations at its Federal Way Clinic for children ages 5 through 12, completed by a clinical psychologist and a psychiatric ARNP. This age band has historically had the longest waits in the whole system, which is exactly why the location was added.

How it works: appointments go first to families already on the Autism Center waitlist. New referrals join one centralized waitlist and get triaged to a location by availability and by how close you live. So you don’t request Federal Way specifically. You get referred to the Autism Center, and geography is part of how they route you. If you’re in South King County, say so when you call.

UW Autism Center, Seattle: no referral needed

Ages 0–3 and 3–18. No physician referral required for children, which makes this the fastest route to starting for a lot of families. You can register yourself online instead of waiting on your pediatrician’s office.

Intake (206) 616-8642, uwautism@uw.edu. Washington State residents only. They’re direct that “wait times greatly vary” and that joining the waitlist doesn’t guarantee services. A published fee schedule has put a standard diagnostic evaluation in the $2,250–$2,500 range, with a deposit due at the first visit. Confirm current figures and how your plan applies when you register.

Mary Bridge Children’s, Developmental Behavioral Pediatrics: for South King County

Serves birth to 18. A referral from your child’s primary care provider is required. Developmental Behavioral Pediatrics: 253-403-4437, option 2.

Worth knowing if you’re in Auburn, Federal Way, Kent or Des Moines, where driving north to Seattle for a multi-visit evaluation is its own barrier. There’s a Mary Bridge pediatrics clinic at 202 N. Division St, Auburn: (253) 876-8088. Note that new Developmental Behavioral Pediatrics patients receive a diagnostic evaluation only, typically across 1 to 4 visits; ongoing care goes back to your regular providers with referrals in hand.

Private-pay, when the wait is the problem

If you can absorb the cost, private-pay evaluations are usually measured in weeks rather than months. You’re buying time, and for a three-year-old, time is the whole point.

Sunburst Psychology: Seattle and Bellevue, serving Kirkland, Redmond and Mercer Island as well. Ages 3 through 65. A standalone autism evaluation is $3,390; combined autism and ADHD testing is $5,300, including all sessions, the written report, and a feedback meeting. Private pay only. They don’t bill insurance, but they provide superbills for out-of-network reimbursement, and HSA/FSA funds are commonly used. Reports typically land 2–4 weeks after testing, longer for complex cases.

Northwest Pediatric Neuropsychology: 2310 130th Ave NE, B-203, Bellevue. Ages 5 through 25. Autism among the conditions assessed, alongside ADHD and learning disorders. Pricing isn’t published; they offer a free phone consultation at (206) 627-0109.

Before you commit to private pay, call your insurer and ask specifically about out-of-network reimbursement for psychological testing. Some plans reimburse a meaningful share of a superbill, which changes the math considerably.

Your pediatrician probably can’t diagnose

A lot of Eastside families start at their pediatrician’s office and come away confused, because the visit produces a concern rather than a diagnosis.

Lighthouse Pediatrics in Issaquah (1505 NW Gilman Blvd, Ste 8, (425) 357-7082) describes their role plainly, and it’s typical of primary care: developmental history, parent observations, input from teachers and therapists, structured screening tools, and referral for formal diagnostic testing when appropriate.

That’s the correct role. The referral is what gets you onto the waitlist at Seattle Children’s or Mary Bridge. Just don’t expect to leave with a diagnosis, and don’t read the referral as your pediatrician passing the buck. Screening and diagnosing are different jobs.

If you’re at the stage of “something feels different but I can’t name it,” start with our simple screener for parents and bring the results to that appointment. Specific observations move a pediatrician visit along much faster than general worry.

If you have Apple Health, read this before you book anything

This is the most expensive mistake we see, and it’s entirely avoidable.

For Apple Health (Medicaid) clients age 20 and under, ABA therapy requires that a recognized Center of Excellence (COE) conduct the comprehensive evaluation and write an order for ABA, completed within the last two years.

That means a family can wait months, pay for or complete an evaluation elsewhere, receive a valid autism diagnosis, and still not be able to start ABA on Apple Health, because the evaluating provider wasn’t a designated COE.

Not every diagnostic provider is a COE, and the list changes. The Health Care Authority maintains the current directory by county (the HCA Center of Excellence list), and questions go to aba@hca.wa.gov. In King County, Seattle Children’s (both the Autism Center and the Neurodevelopmental Clinic) has been on that list; Mary Bridge Children’s sites cover the Pierce County side, including Auburn.

One phone call prevents this. Before you accept an evaluation appointment, ask: “Are you a designated Center of Excellence for Apple Health ABA, and will the evaluation include a written order for ABA?” If you have commercial insurance instead, the COE rule doesn’t apply to you, but ask your plan what documentation it needs, because requirements still vary. Our Washington ABA insurance guide covers the commercial side.

A school evaluation is not a medical diagnosis

Your district will evaluate your child for free, starting at age 3, and you should absolutely request it in writing. But understand what it produces.

A school evaluation determines educational eligibility for special education and an IEP. It does not produce a medical diagnosis, and insurance will not accept it as the basis for funding ABA. ABA is billed as a medical service, so it needs a medical diagnosis behind it.

The right move is both, at the same time. They answer different questions, neither substitutes for the other, and running them in parallel costs you nothing but a couple of phone calls. For the school side, see understanding the sections of an IEP and navigating the IEP process. Issaquah families can start with children with special needs in Issaquah, which has the district Child Find number and the local clocks.

While you wait

The wait is the hardest part, and it’s not dead time.

• Under 3? Start ESIT services now, as above. No diagnosis required.
• Request the school evaluation in writing today if your child is 3 or older.
• Keep a running log: short notes on communication, play, transitions, sleep, sensory reactions. Evaluators ask for developmental history and most parents blank in the room. Notes with dates are worth more than a good memory.
• Get your insurance questions answered early, so the day the diagnosis arrives you’re not starting a benefits investigation from zero. Our insurance journey guide walks through it.
• Read up on what comes next: why a diagnosis is needed for ABA and our new autism diagnosis guide.
• Get out of the house. Genuinely. See our autism-friendly parks and playgrounds on the Eastside.

Once you have the diagnosis

Call your ABA provider the same week. Authorization takes time on its own, and providers can often begin intake paperwork while the insurance side is processing.

Orchid Academy serves families across the Eastside and South King County: academies in Issaquah, in-home ABA in Bothell, school and in-home ABA in Kirkland and Sammamish, and in-home ABA in Bellevue, Covington and Federal Way. For an Issaquah academy, compare Creekside’s early-learning ABA program with Maple Street’s school-readiness ABA program. Issaquah-specific next steps (hours and insurance) are in autism in Issaquah. You can also see all locations or contact us at (425) 699-7164. If your child is under 3 or newly diagnosed, our early intervention program is usually the right starting point.

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Provider details above were verified in August 2026. Wait times, pricing, age ranges and Center of Excellence designations change, so please confirm directly with each clinic before making decisions. We list these providers as a service to families and have no financial relationship with any of them.