Occupational Therapy Software: Build Custom vs. Buy Therabill, WebPT, or TherAssist

You have five therapists across two clinic sites and a school district contract that started this year. Therabill handles your outpatient billing well enough, but it has no concept of IEP goals or service minutes. WebPT tracks your authorization counts, but exporting data to reconcile your district billing takes three hours every Friday. TherAssist manages your pediatric scheduling, but switching between it and the district's special education system means your therapists are entering session data twice.

You are not chasing a feature upgrade. You are deciding whether occupational therapy software built for single-location outpatient practices can actually run a multi-site group with a school caseload - or whether the workarounds are now the job.

This article covers what custom OT software costs, when Therabill, WebPT, and TherAssist are the right answer, what a phased build looks like for pediatric clinics and school-based programs, and where these projects go wrong.

What custom occupational therapy software costs

Before anything else, here are the numbers.

Monthly infrastructure runs $2K-$5K depending on patient volume and hosting configuration. The IEP documentation module adds 6-8 weeks to the full platform timeline because it requires a data model separate from your clinical SOAP documentation. You cannot bolt it on after the fact without rebuilding your database schema.

Therabill, WebPT, and TherAssist vs. custom OT software

This is the decision that determines your next five years of operations. Getting it wrong in either direction is expensive.

Therabill is a billing-first practice management platform built for therapists and therapy groups. It handles claims submission, ERA posting, authorization tracking, and basic scheduling. Pricing runs roughly $49-$149/month depending on provider count and features. For single-location outpatient OT with a straightforward payer mix, Therabill's billing infrastructure is solid. Where it hits its ceiling: school-based OT billing is a fundamentally different entity from clinical billing. District contracts, service-minutes tracking, and IDEA-compliant progress reports do not map to Therabill's billing model. If you hold a district contract, you will be running a separate process alongside it.

WebPT is a broad-spectrum rehab therapy platform covering PT, OT, and speech. It runs $99-$200/month per therapist and handles standard outpatient OT documentation well - SOAP notes, progress notes, insurance billing, and authorization tracking. Its reporting works for single-location practices. Where it breaks: school-based OT is not in its vocabulary. There is no IEP goal module, no IDEA-compliant progress reporting, and no way to split billing by district versus clinic. If you serve a school district, you will maintain a parallel spreadsheet system alongside WebPT. That is not a workflow inconvenience. That is a compliance exposure.

TherAssist is designed specifically for pediatric therapy - OT, PT, and speech - with goal tracking, scheduling, and family communication features built for a pediatric caseload. It handles pediatric assessments better than general-purpose platforms and manages the scheduling complexity of pediatric group therapy. Where it breaks: TherAssist's goal tracking is not IEP-compliant documentation. It is a clinical goal tracking tool, not an IDEA-compliant progress reporting system. When a district audits your service records, TherAssist output does not satisfy the documentation standard for federally mandated IEP services.

According to a 2023 American Medical Association survey, 94% of physicians report that prior authorization creates care delays. For OT specifically, authorization management is among the highest-volume administrative burdens - and the place where inadequate software most directly costs you revenue.

When custom occupational therapy software wins:

• You operate two or more OT locations and need consolidated payer reporting across sites

• You hold a school district contract requiring IDEA-compliant IEP progress documentation and service-minutes tracking

• You have payer-specific billing rules - Medicaid managed care, state waiver programs - that none of the platforms handle natively

• You are building a platform to license to a network of pediatric therapy clinics rather than just operate internally

• Your home health OT program requires custom visit documentation that does not map to standard SOAP templates

The threshold where custom starts making financial sense is roughly when your annual SaaS spend exceeds $80K and you are still maintaining manual workarounds alongside the software. At that point, you are paying for the tool and the workaround.

Who actually builds custom OT software

Multi-location pediatric OT groups. You have grown from one clinic to three or four locations. Each site runs its own scheduling, billing, and documentation. You cannot get a consolidated view of authorization status across sites without exporting from your current tool into a spreadsheet. You need one system that treats your group as one business, not a collection of separate subscriptions with no shared data layer.

School district OT programs and contractors. You hold contracts with one or more school districts. Your therapists document IEP goal progress each session, track service minutes against the student's IEP mandate, and generate quarterly progress reports for IEP review meetings. Your current system is a combination of the district's special education software, a clinical documentation tool, and spreadsheets. Nothing connects to anything else. A district compliance audit is a manual fire drill every time it happens.

Home health OT agencies. You send therapists into patients' homes for ADL training, home modification assessments, and adaptive equipment training. Documentation happens on mobile devices in the field. Visit notes need to capture home environment observations, equipment recommendations, and caregiver training - none of which maps to a standard outpatient SOAP template. Authorization tracking across multiple payers is a daily operations burden.

Therapy platform founders. You are not running a single practice. You are building a platform to power a network of pediatric therapy providers or license to school district OT programs. You need software infrastructure, not a practice management subscription.

V1, V2, and V3: What you build and what it costs

V1 - Core operations ($150K-$250K, 14-20 weeks)

Scheduling with service mode selection. When a session is booked, the scheduler captures the service type: outpatient clinical, school-based, or home health. That flag controls which documentation flow opens after the session ends. A school-based session opens the IEP goal tracker. An outpatient session opens the SOAP note. Group sessions common in school OT need to support one therapist with multiple students in one slot, with individual notes per student generated from a single visit entry.

OT-specific SOAP documentation. The objective section needs structured data entry for population-specific assessments, not open text fields. Pediatric OT uses the Sensory Processing Measure, Sensory Profile 2, and BOT-2 motor proficiency test. Adult rehabilitation uses the Functional Independence Measure. Geriatric OT uses the Berg Balance Scale and IADL assessments. Scores must be stored as structured data so you can track measurable progress over time and generate outcome reports. A single generic SOAP template does not serve all three populations.

Insurance authorization tracking. Each patient carries an authorization with an approved visit count and expiration date. The system needs to count sessions against that limit and alert your front desk when a patient has three to five visits remaining. Practices that track authorizations manually write off an average of 3-8% of sessions annually due to exceeded visit limits - sessions delivered but not covered because the authorization expired or the visit limit was hit without warning. This feature pays for itself in most mid-size practices within the first year.

Billing. Clean claim generation, ERA and EOB posting, and payer-specific billing rule support. If you bill Medicaid, your billing module needs to handle managed care organization rules and state-specific modifiers for OT services.

V2 - School-based IEP documentation ($80K-$120K additional, 6-8 weeks)

This module is the one that separates occupational therapy software from school-based OT software. Under the Individuals with Disabilities Education Act, every school-based OT session must tie back to documented IEP goals with measurable progress data. A modified SOAP note does not satisfy this requirement.

An IEP goal follows a specific structure: student, behavior, condition, and criterion. A real example: "Given a standard shirt with buttons, [Student] will button the shirt independently in 4 out of 5 consecutive trials." Each session, your therapist records how many trials occurred and how many the student completed without assistance. The system calculates a running mastery percentage. When the student reaches criterion across a defined window of sessions, the goal is marked mastered.

The module needs to:

• Import IEP goals per student at the start of each service period

• Record trial data per session linked to specific goals

• Calculate rolling mastery percentages across a configurable session window

• Track service minutes delivered against the student's IEP-mandated frequency

• Generate IDEA-compliant progress reports at quarterly and annual IEP review periods

According to the American Occupational Therapy Association's 2023 Workforce Study, approximately 30% of OTs work in school settings - roughly 37,000 practitioners whose primary documentation workflow is IEP-based. If your platform skips this module, you are closed off from a third of the OT market from day one.

"Documentation burden is the number-one reason occupational therapists leave school settings. We spend 40% of our time on paperwork that a well-designed system could cut by half." - Winnie Dunn, PhD, OTR, FAOTA, Distinguished Professor Emerita, University of Missouri, speaking on OT workforce challenges at the 2022 AOTA symposium.

V3 - Caregiver portal, home program builder, and adaptive equipment tracking ($60K-$100K additional, 8-12 weeks)

Home program builder. Between sessions, families carry out exercises at home. For pediatric sensory patients, this is a sensory diet: a scheduled set of sensory activities to help regulate the child throughout the day. The therapist builds the program from a library of exercises with descriptions and images, then sends it to the caregiver through the portal. This replaces the printed handout and fax workflow. Caregivers log completion through the portal, which gives therapists data on home follow-through that they can reference in session notes.

Adaptive equipment tracking. OT practitioners regularly recommend equipment - grab bars, wheelchair cushions, splints, dressing aids. The system generates letters of medical necessity (required by most payers for durable medical equipment), tracks whether the patient received the equipment, and records training completion. If you supply some equipment directly, basic inventory tracking connects here.

Telehealth. OT via video is standard for home exercise instruction, caregiver training, and home safety assessments. The video session links to the appointment record. Screen sharing matters for remote home assessments: the therapist can view the patient's kitchen layout, bathroom configuration, and reach heights to make equipment recommendations without a home visit. Post-session notes link directly to the video encounter record.

Where OT software projects fail

Treating IEP documentation as a SOAP variant. This is the most common architectural mistake in occupational therapy software development. A SOAP note is a time-stamped narrative with assessment scores. An IEP session record is a set of trial observations linked to specific goals across a period of time. These are different entity types in your database. Development teams that model IEP data as a field inside a SOAP note record end up with a system that cannot generate IDEA-compliant progress reports, cannot calculate rolling mastery percentages, and cannot pass a district compliance audit. You discover this six months into the project, after the schema is established. Rebuilding the data model at that point is a significant rework - typically adding 8-12 weeks and $60K-$100K to the project.

Underestimating payer-specific billing rules. OT billing varies more by payer than most other practice types. Medicaid managed care organizations carry state-specific modifier requirements, visit limit structures, and prior authorization workflows that commercial insurance does not. If your practice has a Medicaid or state waiver caseload, your billing module needs those rules in the requirements from day one. Bolting payer-specific logic onto a standard billing module after the fact costs two to three times what it would have cost to build correctly upfront - and the rework often requires changes to the claim data model, not just the submission logic.

The Centers for Medicare and Medicaid Services 2023 data shows that OT is among the top five therapy specialties by Medicaid claim volume in most states. That payer complexity is not optional to address - it is the core of your revenue cycle.

How RaftLabs builds occupational therapy software

RaftLabs has shipped healthcare practice management platforms with complex documentation requirements, multi-payer billing, and compliance-sensitive workflows. We do not start with a generic healthcare template and customize. We start with your patient populations, your payer mix, and whether you have a school-based caseload. Those three inputs determine your data model, your documentation flows, and your billing architecture before a single line of code is written.

For OT software development, the first conversation is about whether you need the IEP module. If you do, we design it as a first-class module from the start - not a modification of the clinical SOAP system. That decision changes your database schema, your session record types, your reporting architecture, and your compliance posture. Getting it right in week one is the difference between a six-month build and a twelve-month rebuild.

For multi-site OT groups, we design the authorization tracking and billing modules around your payer matrix before touching scheduling or documentation. The billing architecture is the hardest thing to change after the fact, and it is the piece most teams underspec in early conversations.

If you run a home health OT program, your V1 is different from a clinic's V1. Mobile-first documentation, offline sync for in-home visits, and flexible visit note templates come first - before the caregiver portal or telehealth features that matter more for clinic-based practices.

If you are evaluating whether custom occupational therapy software makes sense for your practice or program, the right next step is a scoping call. We will map your patient populations, payer rules, and documentation requirements to a phased build plan with a realistic cost range and timeline.

See our healthcare software development service or contact us to scope your project.