Appendix E - National Coverage Determinations Manual / PARTIAL_THROMBOPLASTIN_TIME

Why This Topic Matters

Coverage policies for laboratory coagulation testing affect whether claims are payable and whether documentation supports medical necessity. This article helps coders, billers, auditors, and clinicians understand the scope of the PTT policy and the general categories of circumstances discussed by Medicare.

Article Sections

1. Partial Thromboplastin Time (PTT)

   Introduces the laboratory test and its general role in coagulation assessment. Provides the policy context for the coverage guidance that follows.

2. Indications

   Summarizes the broad clinical situations addressed by the policy, including anticoagulation monitoring, bleeding or thrombotic presentations, and other conditions associated with coagulation abnormalities.

3. Limitations

   Describes the general circumstances where routine use is limited or not supported, including repeat testing and pre-intervention testing considerations.