Whenever an operating microscope is used.
Whenever an unusually complicated procedure is performed.
Whenever a prolonged procedure is performed.
When the provider is performing the surgical procedure only and not the post-op care.

2. Modifier used when considerably more than is customary is performed during a given procedure.

-52
-22
-25
None of the Above

3. Modifier -25 can also be reported as:

mod25
25.00
09925
None of the Above

4. Modifier -50, Bilateral Procedure, is used when:

A CPT code is not specifically noted as bilateral in the CPT manual.
A unilateral procedure is performed on both right and left sides of the body.
There are two approaches to a surgery.
All of the above.

5. Modifier -51: 

Should always be used with "Add on" codes.
Is used to indicate reduced services.
Indicates a repeated procedure during the global period..
None of the above..

6. Modifiers T1 to T9 are:

CPT Level I modifiers.
Are used to denote Lumbar vertebrae. 
Are Level II modifiers to specify digits on each foot.
Are used to specify levels of complexity for anesthesia codes.

7. If a procedure is complicated by the late effects of a previous surgery, irradiation, infection or very low birth weight (and there is NOT a separate CPT code identifying these) :

 Use modifier -21.
Use modifier -22.
Use modifier -57.
Use modifier -78.

8. The -90 modifier means:

Mandated service.
Reference outside laboratory.
Multiple modifiers
Microsurgery.

9. A laboratory test is rerun due to malfunction of the equipment. Use modifier:

-52.
-90.
-91.
No modifier should be used in this circumstance.

10. A laboratory test is rerun to confirm the initial results. Use modifier:
-52.
-90.
-91.
No modifier should be used in this circumstance.