In Memoriam: Gregory B. Root
National Coverage Determination
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Partial Thromboplastin Time (PTT)
CMS Policy Number: 190.16
Description: Basic plasma coagulation function is readily assessed with a few simple laboratory tests: The Partial Thromboplastin Time (PTT), Prothrombin Time (PT), Thrombin Time (TT), or a quantitative fibrinogen determination. The PTT test is an in vitro laboratory test used to assess the intrinsic coagulation pathway and monitor heparin therapy.
1. The PTT is most commonly used to quantitate the effect of therapeutic unfractionated heparin and to regulate its dosing. Except during transitions between heparin and warfarin therapy, in general both the PTT and PT are not necessary together to assess the effect of anticoagulation therapy. PT and PTT must be justified separately.
2. A PTT may be used to assess patients with signs or symptoms of hemorrhage or thrombosis. For example:
Abnormal bleeding, hemorrhage or hematoma petechiae or other signs of thrombocytopenia that could be due to Disseminated Intravascular Coagulation
Swollen extremity with or without prior trauma
3. A PTT may be useful in evaluating patients who have a history of a condition known to be associated with the risk of hemorrhage or thrombosis that is related to the intrinsic coagulation pathway. Such abnormalities may be genetic or acquired. For example:
Acute or chronic liver dysfunction or failure, including Wilson’s disease
Liver disease and failure
Disseminated intravascular coagulation
Lupus erythematosus or other conditions associated with circulating inhibitors, e.g., factor VIII Inhibitor, lupus-like anticoagulant
Von Willebrand’s disease
Arterial and venous thrombosis, including the evaluation of hypercoagulable states
Clinical conditions associated with nephrosis or renal failure
Other acquired and congenital coagulopathies as well as thrombotic states
4. A PTT may be used to assess the risk of thrombosis or hemorrhage in patients who are going to have a medical intervention known to be associated with increased risk of bleeding or thrombosis. An example is as follows: evaluation prior to invasive procedures or operations of patients with personal or family history of bleeding or who are on heparin therapy
1. The PTT is not useful in monitoring the effects of warfarin on a patient’s coagulation routinely. However, a PTT may be ordered on a patient being treated with warfarin as heparin therapy is being discontinued. A PTT may also be indicated when the PT is markedly prolonged due to warfarin toxicity.
2. The need to repeat this test is determined by changes in the underlying medical condition and/or the dosing of heparin.
3. Testing prior to any medical intervention associated with a risk of bleeding and thrombosis (other than thrombolytic therapy) will generally be considered medically necessary only where there are signs or symptoms of a bleeding or thrombotic abnormality or a personal history of bleeding, thrombosis or a condition associated with a coagulopathy. Hospital/clinic-specific policies, protocols, etc., in and of themselves, cannot alone justify coverage.
To review all requirements of this policy, please see:
CMS NCD listing by Chapter
Covered ICD-10 Codes.
.... and many more.
|A01.00||Typhoid fever, unspecified|
|A01.02||Typhoid fever with heart involvement|
|A01.09||Typhoid fever with other complications|
|A01.1||Paratyphoid fever A|
|A01.2||Paratyphoid fever B|
|A01.3||Paratyphoid fever C|
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