Educational Diagnostician Job Description

An Educational Diagnostician is the school-based evaluator who decides, with a team, whether a struggling student has a disability under the Individuals with Disabilities Education Act (IDEA) and what that disability means for instruction. The job sits inside a district's special education department, and the title is a state credential rather than a generic label: Texas certifies diagnosticians through its Student Services certificates, and New Mexico licenses them for Pre K-12. O*NET does not give the job its own code; it lists educational diagnostician as one of the reported titles under School Psychologists.

The evaluation cycle

Work starts with a referral. A teacher, a parent, or an intervention team flags a student whose progress has stalled, and the diagnostician pulls the record: grades, state test history, intervention data, attendance, vision and hearing screenings, and any outside reports a family brings in. From that review comes an assessment plan matched to the question being asked. A suspected reading disability calls for achievement testing, phonological processing and rapid naming. A question about intellectual disability calls for a cognitive battery plus an adaptive behavior scale. Instruments such as the WISC-V, WIAT-4 and KTEA-3 are the daily kit, along with rating scales, classroom observation and structured interviews.

The clock matters. Every initial evaluation runs against a legal deadline that starts when the parent signs consent, and the deadline is set by federal rules and state law together, so it differs from one state to the next. In Texas the product is called a Full and Individual Initial Evaluation (FIIE), and a diagnostician who changes states has to relearn both the vocabulary and the calendar.

Reports and meetings

The written report is the product. It explains each test, what it measures, how the student scored, and how those scores line up with classroom evidence, then states whether eligibility criteria are met. Families, teachers, administrators and sometimes attorneys all read it, so it has to be plain enough for a parent and precise enough to defend at a due process hearing.

In Texas the diagnostician then presents findings at the Admission, Review and Dismissal (ARD) committee meeting, the state's name for the IEP team meeting. Explaining why a student qualifies, or does not, to a parent who has waited weeks for an answer is a skill of its own. After eligibility, the diagnostician returns for reevaluations and answers consultation requests from teachers about accommodations and intervention data.

Dyslexia evaluations in Texas

Texas sends dyslexia evaluations through special education procedures. The State Board of Education's 2024 Dyslexia Handbook says that when schools refer and evaluate students suspected of having dyslexia, they must follow FIIE procedures under IDEA. In practice that routes reading evaluations through the special education evaluation team, which can include the diagnostician.

The Texas route

Texas sets out this credential in detail. The Texas Education Agency lists the Educational Diagnostician certificate among its Student Services certificates and spells out the requirements on its own page:

• Complete an approved educator preparation program (EPP) for educational diagnostician.
• Hold a master's degree from an institution accredited by an agency recognized by the Texas Higher Education Coordinating Board.
• Pass the required test, the TExES Educational Diagnostician (253) exam, which replaced the older 153 exam.
• Hold a valid classroom teaching certificate.
• Have three years of classroom teaching experience in a public or accredited private school.

That last pair is the defining feature. A diagnostician is a teacher first. TEA's page notes that since Sept. 1, 2023, school counselors no longer need two years of classroom teaching, while a diagnostician must still hold a valid teaching certificate and three years of classroom teaching experience.

New Mexico and other states

New Mexico's Public Education Department licenses educational diagnosticians Pre K-12. Its initial license calls for 30 graduate hours in an educational diagnosis or school psychology program, including a 300-hour internship for candidates who began a diagnosis program after July 1, 2006, plus a content assessment or a national certification from the National Association of School Psychologists. Where a state has no diagnostician credential, evaluation work falls to other licensed evaluators such as school psychologists, so a candidate planning to move should read the target state's licensure page before choosing a program.

Credentials worth knowing

• Educational Diagnostician certificate, Texas Education Agency (State Board for Educator Certification).
• Educational Diagnostician license (Pre K-12), New Mexico Public Education Department.
• Nationally Certified School Psychologist (NCSP), National Association of School Psychologists, relevant where states accept it for evaluation roles.
• School Psychologist (SP) license, Texas Behavioral Health Executive Council, called the Licensed Specialist in School Psychology (LSSP) until September 1, 2025. This is a separate psychology license, not a diagnostician credential, and the two roles can sit on the same evaluation team.

What the background usually looks like

As a rough guide, diagnosticians come from three to seven years of special education or general classroom teaching before finishing a master's program in educational diagnostics or special education. Teachers who have run reading interventions, kept progress-monitoring data and sat through ARD or IEP meetings bring useful habits into graduate coursework.

Graduate programs cover test theory, cognitive and achievement assessment, eligibility criteria for each IDEA category, assessment of English learners, and report writing, with a practicum that puts the candidate in front of real referrals under supervision.

The skills that separate strong diagnosticians are less about test administration than judgment: picking the smallest battery that answers the referral question, noticing when scores contradict classroom evidence, and writing a report that a teacher can turn into instruction the next morning. Calendar discipline counts too, because a missed state deadline can become a compliance finding for the district. Spanish fluency is an asset in districts with large emergent bilingual enrollment, where language proficiency has to be separated from disability.

What the federal numbers cover

BLS does not report educational diagnosticians separately. O*NET files the title under School Psychologists, an occupation of about 64,000 workers in 2025 that it projects to grow slower than average, 1% to 2%, from 2025 to 2035, with about 3,400 openings a year on average. Those figures describe school psychologists as a whole, including licensed psychologists with broader mental health duties, so read them as context for the evaluation workforce rather than a forecast for this credential.

One state's example: Texas

Texas, which builds this job into its certification system, offers one state's example. TEA's 2025 annual report counts 857,520 students served in special education in 2024-25, 15.5% of Texas students, up from 9.2% in 2017-18. TEA's enrollment report shows students identified with dyslexia rising from 329,228 in 2023-24 to 356,830 in 2024-25.

Evaluations are the front door to those numbers. TEA reports 178,645 initial special education evaluations in 2024-25 and says the number of these evaluations has increased significantly in recent years. Each one needs a qualified evaluator and a written report delivered on a state deadline.

New money tied to evaluations

The 89th Texas Legislature attached funding directly to that work. Under House Bill 2 (Texas Education Code 48.159), beginning in the 2025-26 school year each local education agency is entitled to $1,000 for every completed FIIE, including evaluations of children in private school and homeschool. TEA's report lists $178M in special education evaluation funding. The money flows to districts, not to individual diagnosticians, but it gives districts a revenue line tied to the work diagnosticians produce.

Pay

District salary schedules set pay. As one example, San Elizario ISD's 2025-26 Administrative Professional Pay Scale lists an educational diagnostician on a 173-day calendar at $67,821.84 minimum, $80,740.48 midpoint and $93,659.12 maximum. That is one district's schedule, not a state benchmark. The band on this page is the BLS range for school psychologists in elementary and secondary schools, the nearest federal measure, and it may run above what diagnosticians earn.

How AI is entering the work

One place generative AI is being tested is the written report. A study in the Journal of Psychoeducational Assessment (September 2025) had 249 licensed psychologists rate reports written by psychologists against reports produced by GPT-4. Human-written reports were generally rated more favorably, but effect sizes were typically small, and the AI reports showed moderate effect sizes for the quality of their recommendations. The study rated psychologists' reports, not diagnosticians', and it does not settle whether AI belongs in eligibility decisions. Whatever drafting help a district adopts, the confidentiality of student records and the defensibility of every sentence still rest on the evaluator who signs the report.

Where the jobs are

Diagnosticians work for public school districts, charter networks and regional education service centers, and contract evaluation firms also hire them to complete evaluations for districts. A candidate's best research tool is the target district's own salary schedule and its count of open evaluations.

Dear Dr. Ramirez,

Please consider me for the diagnostician opening in Brazos Valley ISD's special education department. I completed my educator preparation program in educational diagnostics this spring, passed the TExES Educational Diagnostician exam, and bring six years of classroom teaching, the last four in a fourth- and fifth-grade resource room.

Teaching resource reading taught me what a good evaluation report is worth. I have sat in ARD meetings where the report gave me a clear target for instruction, and in others where I left with a list of standard scores and no idea what to teach on Monday. I want to write the first kind.

During my practicum at Oak Hollow Elementary I completed eleven initial evaluations under supervision, including four dyslexia referrals handled as FIIEs. I built a shared tracking sheet with the campus special education team that showed consent date, absences and the report due date for every open case, and none of our cases went past the timeline that semester. My supervisor asked me to present two of those cases at ARD meetings, and I learned to open with what the student does well before walking a parent through the scores.

I am fluent in Spanish and conducted three of my practicum evaluations with bilingual families, including parent interviews in Spanish and coordination with the language proficiency assessment team to separate second-language acquisition from a learning disability.

I would welcome the chance to talk about how I approach referral review and battery selection, and how I could support your teachers with intervention data before referrals reach the evaluation team. Thank you for your time and consideration.

Sincerely, Elena Vasquez