Specialty rules are applied to the practice's payers, documentation, and schedule during the engagement.
Where the billing gets difficult
Units taken from the scheduled hour
Four units billed because the slot was an hour, while the note shows twenty minutes, will not survive a review.
Plans of care that expire
Treatment after a plan expires or before certification, when the payer requires it, denies in a string of dates of service.
Assistant minutes unreported
Modifiers for therapy assistants exist so payers can apply their policy. Omitting them when an assistant furnished the minutes is a compliance problem.
Coding considerations
Timed versus service-based codes
Evaluations are often service-based. Therapeutic exercises and manual therapy are often timed. The unit method follows the code.
8-minute rule
For Medicare and payers that use it, units are calculated from total timed minutes under that rule. Other payers are not forced onto it.
Assistant modifiers
CQ and CO modifiers are applied when a therapy assistant furnished the outpatient therapy minutes those modifiers describe.
Documentation the claim needs
- Minutes by intervention
- A current plan of care and certification status
- Who furnished the minutes, therapist or assistant
- Functional progress that supports continued care
Reimbursement complexity
Therapy revenue is unit-driven, so small minute errors repeat across a full schedule. Medicare also uses a threshold mechanism, often called the KX threshold, after which additional documentation and a modifier are required. The dollar amount of that threshold changes and is not printed here as a current figure. Commercial authorizations count visits or units and run out quietly. Patient collections rise when visit limits were not explained at the evaluation.
Proposed approach
01
Calculate units from minutes
The note's minutes are the input. The payer's unit rule is applied after that, not before.
02
Track plan-of-care dates
Certification and recertification dates gate the claim.
03
Mark assistant-furnished minutes
Modifiers are applied from the treatment log, not from memory at billing.
Workflow checks
- Minute-to-unit calculation
- Plan-of-care date check
- Assistant modifier check
- Authorization or visit-limit countdown
Questions
Do all payers use the 8-minute rule?
No. Medicare's timed-code rule is widely referenced. Other payers may use a different unit method. The claim follows the payer being billed.
What is the current therapy threshold amount?
It changes. We describe the mechanism and look up the figure that applies to the date of service during an engagement. This page will not quote a dollar amount that will go stale.