2025 CPT code 85610
(Active) Effective Date: N/A Pathology and Laboratory Procedures - Hematology and Coagulation Procedures Feed
Prothrombin Time (PT)
Modifiers may be applicable. Modifier 91 is used for repeat testing on the same day. Modifier 90 indicates the test was performed by an outside laboratory. Modifier 99 is for multiple modifiers.
Medical necessity is established by the presence of signs, symptoms, or conditions that suggest a clotting disorder or the need to monitor anticoagulant therapy.
A physician or other qualified healthcare professional draws a blood sample from a vein, typically into a light blue top tube containing citrate to prevent clotting. The sample is then processed in a laboratory to measure clotting time.
In simple words: This test measures how long it takes for your blood to clot. It helps doctors check if you have a bleeding or clotting problem, or if your blood-thinning medication is working correctly.
This test measures the time it takes for blood plasma to clot. It's used to screen for clotting abnormalities, monitor Warfarin therapy, and study hereditary and acquired clotting disorders. It can also be used to assess if blood-thinning medication is working effectively.
Example 1: A patient with unexplained bleeding or bruising may have a PT test to evaluate potential clotting disorders., A patient starting Warfarin therapy needs regular PT tests to monitor the medication's effectiveness and adjust dosage., A patient with a family history of clotting disorders may have a PT test as part of a diagnostic workup.
Documentation should include the reason for the test, relevant medical history (including current medications), and the date and time of sample collection.
- Revenue Code: T1H - LAB TESTS - OTHER (NON-MEDICARE FEE SCHEDULE)
- Modifier TC rule: There are no specific TC modifiers that apply to this code.
- Specialties:Hematology, Internal Medicine, Family Medicine, Cardiology
- Place of Service:Office, Inpatient Hospital, Outpatient Hospital, Independent Laboratory