Knowledge Base Article

A medical claim is a form of communication with a healthcare payer that request payment and describes the services provided to a patient, plus other pertinent information. Medicare and other payers have detailed specifications about the types of information that must be included on a claim. Modifiers are often used on claims to explain the special circumstances of a particular item or service. In honor of National Occupational Therapy (OT) month, we examine some modifiers that are often required for rehabilitative services.

The American Occupational Therapy Association website states that occupational therapists and assistants are part of a vitally important profession that helps people across the lifespan participate in the things they want and need to do through the therapeutic use of everyday activities. In addition to clinical responsibilities, including complete and thorough documentation of their medical services, OTs and other rehabilitative therapists such as physical therapists (PT) and speech language pathologists (SLP) are required to understand some aspects of Medicare therapy billing. For example, therapists need to understand the proper use of some billing modifiers.

Therapy Discipline Modifiers

Services for Medicare patients provided by rehabilitative therapists must be appended with a modifier that describes the therapy discipline. Modifiers are used to identify therapy services whether or not financial limitations (therapy caps) are in effect. When limitations are in effect, Medicare tracks the financial limitation based on the presence of therapy modifiers. The therapy modifiers are:

• GN – Services delivered under an outpatient speech-language pathology plan of care;
• GO - Services delivered under an outpatient occupational therapy plan of care; or,
• GP - Services delivered under an outpatient physical therapy plan of care.

Modifiers GN, GO, and GP refer only to services provided under plans of care for rehabilitative therapy services. They should never be used with codes that are not on the list of applicable therapy services. For institutional claims, the modifiers must correlate with the respective revenue code (PT – modifier GP with revenue code 42x; OT – modifier GO with revenue code 43x; and SLP – modifier GN with revenue code 44x).

Modifier 59

Modifier 59 is appended to a CPT/HCPCS procedure code to indicate that a procedure or service was distinct or independent from other services performed on the same day. It is used to identify procedures/services that are not normally reported together, but are appropriate under the circumstances.

For PT, OT and SLP services, providers should not report more than one physical medicine and rehabilitation therapy service for the same fifteen minute time period with the exception of “supervised modality” codes. Some National Correct Coding Initiative (NCCI) procedure-to-procedure edits pair a “timed” therapy CPT code with another “timed” CPT code or a non-timed CPT code as services that would not normally be reported together. These edits may be bypassed with modifier 59 if the two procedures of a code pair edit are performed in different timed intervals even if sequential during the same patient encounter. When modifier 59 is used, documentation in the therapy record must support that the services were performed at separate and distinct time periods.

Modifier KX

Medicare sets financial limitations on the amount of therapy services a beneficiary may receive in a calendar year. For 2016 the therapy cap amounts are $1,960 for physical therapy (PT) and speech-language pathology (SLP) services combined and $1,960 for occupational therapy (OT) services. Medicare allows an exception when the patient’s condition requires continued skilled therapy beyond the amount payable under the therapy cap, to achieve their prior functional status or maximum expected functional status within a reasonable amount of time. Documentation in the therapy record must justify a medically necessary need for additional therapy beyond the therapy cap.

When exceptions are in effect and the beneficiary qualifies for a therapy cap exception, the provider must add a KX modifier to the therapy HCPCS code subject to the cap limits. By appending the KX modifier, the provider is attesting that the services billed:

• Are reasonable and necessary services that require the skills of a therapist; and
• Are justified by appropriate documentation in the medical record,; and
• Qualify for an exception using the automatic process exception.

When the cap is exceeded by at least one line on the claim, use the KX modifier on all of the lines on that institutional claim that refer to the same therapy cap (PT/SLP or OT), regardless of whether the other services exceed the cap. For example, if one PT service line exceeds the cap, use the KX modifier on all the PT and SLP service lines (also identified with the GP or GN modifier) for that claim. When the PT/SLP cap is exceeded by PT services, the SLP lines on the claim may meet the requirements for an exception due to the complexity of two episodes of service. In addition to the KX modifier, the GN, GP and GO modifiers shall continue to be reported.

Be sure that services are medically necessary and that documentation is sufficiently detailed to support the use of the modifier. Medicare is aware of the potential for misuse of the KX modifier. Note that:

• Routine use of the KX modifier for all patients with certain conditions will likely show up on data analysis as aberrant and invite inquiry.
• Use of the KX modifier when there is no indication that the cap is likely to be exceeded is abusive.
• If the use of the KX modifier is determined to be inaccurate, the provider/supplier is subject to sanctions resulting from providing inaccurate information on a claim.

For more information on the use of the KX modifier, see the Medicare Claims Processing Manual, Chapter 5 , Section 10.3.

Functional Limitation Modifiers

In 2013, Medicare began requiring the reporting of rehabilitative therapy functional limitation information on claims. Claims for outpatient therapy services are required to include non-payable G-codes and modifiers, which describe a beneficiary’s functional limitation and severity level, at specified intervals during the therapy episode of care. The severity modifier reflects the beneficiary’s percentage of functional impairment as determined by the clinician furnishing the therapy services for each functional status: current, goal, or discharge.

Therapists must document in the medical record how they made the modifier selection so that the same process can be followed at succeeding assessment intervals. For more information on functional limitation codes and modifiers, see the Medicare Benefit Policy Manual, Chapter 15, Section 220.4.

When communicating with Medicare and other payers, providers must know the specifics of the service and claim requirements. Proper use of modifiers to provide additional information about the services rendered is necessary for clear communication.