Specialty
Occupational therapy billing services
Occupational therapy billing services turn evaluations by complexity level, timed treatment units, orthotic work and assistant-delivered care into claims that carry GO, CO and KX exactly where Medicare and the plans that copy it expect them.
See where claims are getting stuck. No patient data needed.
Remitwright gives occupational therapy clinics a dedicated biller who counts timed minutes across codes the way the claims manual does, tracks occupational therapy's own KX threshold, keeps certification and progress report dates on a calendar, pools or separates PT and OT visit limits the way each plan does, and works every denial back to its cause.
Occupational therapy billing is one of Remitwright's specialty billing services, each set out with its own code families, denial reasons and payer rules.
Last reviewed by the Remitwright billing team. Editorial policy
- 97110
- 97129
- 97140
Denials
Why occupational therapy claims get denied
The reasons that come up most on occupational therapy remittances, with the usual cause and the fix. Code explanations are our own; the official list is maintained by X12.
| Code | Reason | Usual cause | The fix |
|---|---|---|---|
| CO-4 | Procedure inconsistent with the modifier | CO billed without GO, GO missing, or GP left on occupational therapy lines by a multi-discipline clinic's template | Scrubber rules that occupational therapy codes carry GO, that CO is never sent alone, and that the payer's distinct-service modifier preference is applied, with corrections sent as replacement claims |
| CO-151 | Units exceed what the payer allows | Minutes across timed codes converted to units generously, such as four units billed for fewer than 53 total timed minutes, or an untimed evaluation billed with units | Total timed minutes recorded per visit and converted with the payer's ranges before release, with untimed codes locked to one unit in charge entry |
| CO-97 | Bundled, not separately payable | Therapeutic activities billed with manual therapy, or the evaluation billed with a treatment code the payer pairs on the same date, without a distinct-service modifier the note supports | NCCI edits run before release, and the distinct-service modifier used only when the note shows separate time and a separate purpose |
| CO-119 | Benefit maximum reached | A visit limit the plan pools across physical and occupational therapy, exhausted by another clinic's visits that nobody counted | The limit and the pooling rule recorded at eligibility, visits used confirmed with the plan monthly, and the patient told before the capped visit |
| CO-197 | Authorization absent or exceeded | Visits past the authorized count or end date, a post-surgical hand therapy episode that needed its own authorization, or pediatric therapy a plan authorizes only from the first visit | Authorized visits and dates on the schedule with a countdown, and renewal requested before the last authorized visit with the updated plan and progress summary |
| CO-50 | Not medically necessary | Plan of care not certified or lapsed, progress report missing at the interval, maintenance care billed as skilled, or goals written as vocational rather than functional | Certification and progress report dates on a calendar, claims past the certification date held until it is signed, and goals written as measurable function the plan recognizes |
| CO-16 | Claim lacks information | The assistant listed as rendering provider on a claim the payer wants under the supervising therapist, or the supervising therapist's NPI and taxonomy missing where the plan requires them | Provider setup per plan that maps each assistant to the therapist the plan wants on the claim, checked before the first claim leaves |
Codes
Common occupational therapy codes and modifiers
Code families by number with our own one-line explanations. CPT descriptors belong to the AMA and are not reproduced here.
| Codes | What the family covers |
|---|---|
| 97110, 97112, 97530, 97535 | Timed treatment codes in 15-minute units for therapeutic exercise, neuromuscular re-education, therapeutic activities and self-care or home management training; the codes most occupational therapy visits are built from |
| 97129, 97130 | Cognitive function intervention in 15-minute units, one code for the first unit and another for each additional unit, used after stroke, brain injury and in dementia care |
| 97140, 97150 | Manual therapy in timed units, and group therapeutic procedures billed once per patient per session when two or more patients are treated at the same time |
| 97165-97168 | Occupational therapy evaluations at three complexity levels plus the re-evaluation; untimed, with the level resting on the documented occupational profile, the assessments performed and the decision making, not the minutes |
| 97537, 97542, 97755 | Community or work reintegration training, wheelchair management and assistive technology assessment, each timed and each with its own documentation expectation about function |
| 97760-97763 | Orthotic and prosthetic management and training, split between the first encounter and later ones, timed, and distinct from the supply code for any device fabricated |
| L3650-L3999 | Upper-limb orthoses fabricated or fitted in the clinic, billed as supplies under DMEPOS rules that differ from the therapy codes, including who may bill them and how |
Modifiers that matter
- GO
- Required on every service delivered under an occupational therapy plan of care for Medicare and the payers that follow it. Institutional lines with the occupational therapy revenue code may carry only GO, and the evaluation codes always carry it. Without it the claim is returned before adjudication.
- CO
- Appended when an occupational therapy assistant furnished the service in whole or in part, meaning more than 10 percent of a unit's time under CMS's de minimis standard. It must be paired with GO or the claim is returned as unprocessable, and Medicare pays the line at 85 percent of the fee schedule amount.
- KX
- Added once the patient's occupational therapy spending for the year passes the threshold CMS publishes for occupational therapy on its own, separate from the physical therapy and speech threshold. KX never goes on occupational therapy lines just because the physical therapy lines crossed.
- 59 and the X modifiers
- Two timed codes that NCCI pairs, such as therapeutic activities with manual therapy, delivered as distinct services in separate time blocks with a note that shows it. XU or XS where the payer prefers them to 59.
- 95
- Audio-video telehealth, with the place of service the payer wants. Medicare uses it for outpatient therapy furnished remotely by hospital-employed occupational therapists; other payers set their own rule for which occupational therapy codes they pay by video.
Payers
Payer notes
- MedicareOccupational therapy has its own KX modifier threshold, $2,480 for calendar year 2026, separate from the combined physical therapy and speech-language pathology threshold of the same amount, and its own targeted medical review threshold of $3,000.1
- MedicareThe CO modifier must be paired with GO or the claim is returned as unprocessable; for dates of service on and after January 1, 2022, lines carrying CO are paid at 85 percent of the otherwise applicable fee schedule amount, and the modifier applies to occupational therapists in private practice and to institutional providers paid at fee schedule rates, not to therapy furnished incident to a physician or non-physician practitioner.2
- MedicareCovered occupational therapy includes restoring function impaired by illness or injury, teaching compensatory techniques for activities of daily living, therapeutic activity programs within active treatment of a diagnosed psychiatric illness, and work on sensory-integrative function; a maintenance program is covered when the patient's condition requires the skills of a therapist to carry it out.3
- Medicare (telehealth)Outpatient therapy furnished by telehealth by occupational therapists employed by hospitals is reported with modifier 95, and professional telehealth claims carry place of service 02 when the patient is not at home and 10 when the patient is at home.4
- MedicaidChildren and young adults under 21 are entitled under EPSDT to all Medicaid-coverable, medically necessary services needed to correct and ameliorate conditions found on screening, which is the basis for pediatric occupational therapy coverage in feeding, fine motor and sensory work; the codes, modifiers and authorization process are set by each state.6
- Commercial plansMost apply the NCCI procedure-to-procedure edits and medically unlikely edits, so paired timed codes on one date need a distinct-service modifier with documentation to match, and each code has a daily unit ceiling the claim cannot exceed.5
Authorizations
Medicare does not require prior authorization for outpatient occupational therapy, but it requires a plan of care certified by a physician or non-physician practitioner within 30 days of the first treatment, including the evaluation, recertified at least every 90 days while treatment continues, and a progress report at least once every 10 treatment days. Commercial plans and Medicaid managed care plans authorize in visits and dates; many pool physical and occupational therapy in one allowance, post-surgical hand therapy is often authorized per episode, and pediatric occupational therapy for feeding, fine motor and sensory goals commonly needs authorization from the first visit with a re-evaluation at renewal. Your biller records the authorized visits and end date on the schedule, counts down as visits are booked, and requests renewal before the last authorized visit.
Documentation traps
- Total timed minutes not recorded per code and for the visit, so the unit count cannot be defended when the payer asks for records
- Assistant involvement not recorded per unit, so the CO modifier cannot be applied correctly under the de minimis rule, which is either an underpayment or an overpayment waiting for an audit
- Evaluation complexity level not supported by the documented occupational profile and the number of performance deficits assessed, which downgrades the evaluation on review
- Certification signed later than 30 days after the first treatment, or a plan allowed to run past 90 days without recertification, which exposes every claim in between to recoupment
- Goals written as vocational outcomes or as maintenance rather than as measurable function in daily activities with the skilled need stated
What a specialist checks
Specialist or generalist for occupational therapy billing?
A generalist biller can enter an occupational therapy claim. Whether it pays turns on three things specific to occupational therapy billing, and a specialty-aware biller checks each one.
Code families
Each family billed with what the chart has to show for it.
- 97110, 97112, 97530, 97535
- 97129, 97130
- 97140, 97150
Modifiers
Applied only where the note supports them, line by line.
- GO
- CO
- KX
If you are moving from another billing company or an in-house biller, switching billing companies follows a plan: the old and new processes run side by side until the new one is proven, and every login and every occupational therapy claim stays in your name.
What we handle
What we handle for occupational therapy practices
- Medical codingCPT, ICD-10 and modifiers assigned correctly
- Charge entryEvery encounter captured, nothing left unbilled
- Claim submissionScrubbed, submitted and tracked to acceptance
- Denial managementEvery denial read, worked and appealed
- Prior authorizationAuths requested, tracked, attached to claims
- Eligibility verificationCoverage and benefits checked before visits
A dedicated biller with named cover, working inside your system and reporting to you on one written page. How it works sets out the five stages.
Software
Systems occupational therapy practices usually run
Your biller works inside your system as a user you create. All the systems we work in.
Questions
Questions about occupational therapy billing
Does Medicare pay less when an occupational therapy assistant delivers the service?
Yes. Services furnished in whole or in part by an occupational therapy assistant carry the CO modifier, paired with GO, and since January 1, 2022 Medicare pays those lines at 85 percent of the fee schedule amount. CMS's de minimis standard means CO applies when the assistant's independent part of a unit is more than 10 percent of its time. The rule reaches occupational therapists in private practice and institutional providers paid at fee schedule rates, not therapy billed incident to a physician.
Is the occupational therapy KX threshold separate from physical therapy?
Yes. Medicare tracks occupational therapy against its own annual threshold, $2,480 for calendar year 2026, while physical therapy and speech share a separate threshold of the same amount, with targeted medical review possible past $3,000. A patient who crossed the physical therapy line does not need KX on occupational therapy lines until occupational therapy spending crosses on its own, and putting it there anyway is the kind of pattern reviewers notice.
How do we count units when several timed codes are delivered in one visit?
Medicare adds the minutes of all timed services in the visit and converts the total using its ranges: one unit for 8 through 22 minutes, two for 23 through 37, three for 38 through 52, four for 53 through 67. Sixty minutes of therapeutic activities is four units; forty-five minutes split across two codes is three units in total, distributed to the codes with the most minutes. Untimed codes such as the evaluation are always one unit. Some commercial payers count each code on its own, so the rule is kept per payer.
Can we bill the evaluation and treatment on the same day?
Usually, but some payers run an edit that pairs the evaluation codes with therapeutic activities or manual therapy on the same date and pay both only when the treatment carries a distinct-service modifier and the note shows separate time. Others pay both without a modifier. Your biller keeps the rule per payer so the first claim is right.
Does Medicare cover occupational therapy for daily living skills, or only for restoring function?
Both. Medicare's benefit policy describes occupational therapy as treatment to restore function impaired by illness or injury and, where function is permanently lost, to improve the patient's ability to perform the tasks of independent living, including teaching compensatory techniques for activities of daily living. A maintenance program is covered when the skills of a therapist are needed to carry it out safely. Goals written only as vocational outcomes are the ones that draw denials.
How does Medicaid cover pediatric occupational therapy?
Through EPSDT, which entitles children and young adults under 21 to all medically necessary, Medicaid-coverable services needed to correct and ameliorate conditions found on screening. That makes feeding, fine motor and sensory work coverable where the plan's criteria are met, but each state and its managed care plans set the codes, the modifiers, the authorization rules and where school-based services end and medical therapy begins.
Can occupational therapy be delivered by telehealth?
Medicare reports outpatient therapy furnished remotely by hospital-employed occupational therapists with modifier 95, and telehealth claims carry place of service 02 or 10 depending on where the patient is. Commercial plans and Medicaid programs decide for themselves which occupational therapy codes they pay by video, and some want different modifiers. The rule is recorded per payer at credentialing.
What do you need from an occupational therapy clinic to start?
A signed BAA, a user for your biller in your practice management or EMR system and clearinghouse, each therapist's and assistant's enrollment and credentialing status with each plan, your plan of care and authorization tracking in whatever form it is in, and your payer contracts and fee schedules. Bring an aging report and a denial report to the review if you have them.
Next step
See where your occupational therapy claims are getting stuck.
Three quick questions. No patient data. A billing specialist reads every request and replies in writing.
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- No patient data, no software to buy
- A written reply from a biller, not a sales deck
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A billing specialist reads them
A written reply by email
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- A billing specialist reads your answers and replies by email.
- If a look at real claims makes sense, we agree read-only access under a BAA first.
- You get a written summary of what is worth working and what it would take. No commitment.
While you wait: see the sample weekly report or read how switching works. You can also download the sample weekly report (PDF).