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The CPT® Code 85732 refers to the laboratory test known as the partial thromboplastin time (PTT) with substitution, specifically utilizing plasma fractions. This test is commonly referred to as activated PTT or aPTT. The primary purpose of performing a PTT is to diagnose the underlying causes of bleeding disorders or to serve as a screening tool prior to surgical procedures, ensuring that any potential coagulation defects are identified and addressed. The test involves the mixing of a specific reagent, which contains silica and synthetic phospholipids, with the patient's plasma. The silica acts as a negatively charged surface that activates the contact pathway of the coagulation cascade. Following this activation, calcium chloride is added to the mixture to initiate clot formation. The time it takes for the clot to form is then measured using photo-optical methods. In cases where the PTT results are elevated and the patient is not on anticoagulant therapy, a follow-up test known as a PTT mixing study may be conducted. This involves mixing the patient's plasma with normal plasma in a 1:1 ratio, incubating the mixture, and measuring the clotting time again. The results of this mixing study can help determine whether the patient has an inhibitor, such as lupus anticoagulant, or a coagulation factor deficiency. The CPT® Code 85732 is specifically reported for each instance of the PTT mixing study performed, highlighting its importance in the diagnostic process for coagulation disorders.
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The partial thromboplastin time (PTT) test, as indicated by CPT® Code 85732, is performed under specific clinical circumstances to assess coagulation function. The following indications are explicitly associated with this procedure:
The procedure for conducting the PTT with substitution involves several critical steps, each designed to ensure accurate measurement of clotting time. The following procedural steps are outlined:
After the PTT and any subsequent mixing studies are completed, the results are reviewed and interpreted by a qualified healthcare professional. Depending on the findings, further diagnostic testing or clinical evaluation may be warranted to determine the appropriate management of any identified coagulation disorders. Patients may be monitored for any symptoms of bleeding or other complications, and follow-up appointments may be scheduled to discuss the results and potential treatment options. It is essential to ensure that the patient is informed about the results and any necessary next steps in their care.
| Short Descr | THROMBOPLASTIN TIME PARTIAL | Medium Descr | THROMBOPLASTIN TIME PRTL SUBSTIT PLASMA FRCTJ EA | Long Descr | Thromboplastin time, partial (PTT); substitution, plasma fractions, each | Status Code | Statutory Exclusion (from MPFS, may be paid under other methodologies) | Global Days | XXX - Global Concept Does Not Apply | PC/TC Indicator (26, TC) | 9 - Not Applicable | Multiple Procedures (51) | 9 - Concept does not apply. | Bilateral Surgery (50) | 9 - Concept does not apply. | Physician Supervisions | 09 - Concept does not apply. | Assistant Surgeon (80, 82) | 9 - Concept does not apply. | Co-Surgeons (62) | 9 - Concept does not apply. | Team Surgery (66) | 9 - Concept does not apply. | Diagnostic Imaging Family | 99 - Concept Does Not Apply | CLIA Waived (QW) | No | APC Status Indicator | Conditionally packaged laboratory tests | Type of Service (TOS) | 5 - Diagnostic Laboratory | Berenson-Eggers TOS (BETOS) | T1H - Lab tests - other (non-Medicare fee schedule) | MUE | 4 | CCS Clinical Classification | 233 - Laboratory - Chemistry and Hematology |
| 59 | Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25. | 91 | Repeat clinical diagnostic laboratory test: in the course of treatment of the patient, it may be necessary to repeat the same laboratory test on the same day to obtain subsequent (multiple) test results. under these circumstances, the laboratory test performed can be identified by its usual procedure number and the addition of modifier 91. note: this modifier may not be used when tests are rerun to confirm initial results; due to testing problems with specimens or equipment; or for any other reason when a normal, one-time, reportable result is all that is required. this modifier may not be used when other code(s) describe a series of test results (eg, glucose tolerance tests, evocative/suppression testing). this modifier may only be used for laboratory test(s) performed more than once on the same day on the same patient. | 90 | Reference (outside) laboratory: when laboratory procedures are performed by a party other than the treating or reporting physician or other qualified health care professional, the procedure may be identified by adding modifier 90 to the usual procedure number. | GA | Waiver of liability statement issued as required by payer policy, individual case | 26 | Professional component: certain procedures are a combination of a physician or other qualified health care professional component and a technical component. when the physician or other qualified health care professional component is reported separately, the service may be identified by adding modifier 26 to the usual procedure number. | 77 | Repeat procedure by another physician or other qualified health care professional: it may be necessary to indicate that a basic procedure or service was repeated by another physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 77 to the repeated procedure or service. note: this modifier should not be appended to an e/m service. | GZ | Item or service expected to be denied as not reasonable and necessary | XS | Separate structure, a service that is distinct because it was performed on a separate organ/structure | XU | Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service |
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| 2011-01-01 | Changed | Short description changed. |
| Pre-1990 | Added | Code added. |
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