CAISS Certification
CAISS - CERTIFIED ABBREVIATED INJURY SCALE
SPECIALIST | LATEST EXAM QUESTIONS AND SOLUTIONS -
VERIFIED ANSWERS 2026/2027
CERTIFIED ABBREVIATED INJURY SCALE SPECIALIST (CAISS)
Certification Examination for AIS Coding Specialists
Page 1 of 57
, CAISS Certification
1. Which cranial bone forms the posterior and inferior portion of the
skull and contains the foramen magnum?
A. Occipital bone
B. Parietal bone
C. Sphenoid bone
D. Temporal bone
A. Occipital bone
The occipital bone forms the back and base of the skull, and the foramen
magnum allows the medulla to continue as the spinal cord.
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, CAISS Certification
2. A fracture of the squamous temporal bone that tears the middle
meningeal artery most typically produces which lesion?
A. Intraventricular hemorrhage
B. Subdural hematoma
C. Subarachnoid hemorrhage
D. Epidural hematoma
D. Epidural hematoma
The middle meningeal artery runs between the inner table of the skull
and the dura, so arterial bleeding collects in the epidural space.
3. Tearing of the bridging veins that cross from the cortex to the dural
venous sinuses most commonly produces which injury?
A. Pituitary apoplexy
B. Cerebellar contusion
C. Epidural hematoma
D. Subdural hematoma
D. Subdural hematoma
Bridging veins traverse the subdural space, so their rupture produces a
venous collection beneath the dura.
4. Which dural fold lies in the longitudinal fissure and separates the
two cerebral hemispheres?
A. Diaphragma sellae
B. Tentorium cerebelli
C. Falx cerebri
D. Falx cerebelli
C. Falx cerebri
The falx cerebri is a sickle-shaped dural reflection lying between the right
and left cerebral hemispheres.
Page 3 of 57
, CAISS Certification
5. The brainstem is made up of which three structures?
A. Midbrain, thalamus and medulla oblongata
B. Cerebellum, pons and medulla oblongata
C. Midbrain, pons and medulla oblongata
D. Thalamus, hypothalamus and pons
C. Midbrain, pons and medulla oblongata
The brainstem consists of the midbrain, pons and medulla; the thalamus
and cerebellum are separate structures.
6. How many vertebrae normally make up the cervical spine?
A. 5
B. 12
C. 7
D. 8
C. 7
There are seven cervical vertebrae (C1 to C7), although there are eight
cervical spinal nerves.
7. The first cervical vertebra, which has no vertebral body, is called the:
A. Axis
B. Odontoid
C. Atlas
D. Vertebra prominens
C. Atlas
C1 is the atlas, a ring-shaped vertebra with anterior and posterior arches
and lateral masses but no body.
8. The odontoid process (dens) is a feature of which vertebra?
A. C1
B. C2
C. C7
D. C3
B. C2
The dens projects upward from the body of C2 (the axis) and articulates
with the anterior arch of C1.
Page 4 of 57
CAISS - CERTIFIED ABBREVIATED INJURY SCALE
SPECIALIST | LATEST EXAM QUESTIONS AND SOLUTIONS -
VERIFIED ANSWERS 2026/2027
CERTIFIED ABBREVIATED INJURY SCALE SPECIALIST (CAISS)
Certification Examination for AIS Coding Specialists
Page 1 of 57
, CAISS Certification
1. Which cranial bone forms the posterior and inferior portion of the
skull and contains the foramen magnum?
A. Occipital bone
B. Parietal bone
C. Sphenoid bone
D. Temporal bone
A. Occipital bone
The occipital bone forms the back and base of the skull, and the foramen
magnum allows the medulla to continue as the spinal cord.
Page 2 of 57
, CAISS Certification
2. A fracture of the squamous temporal bone that tears the middle
meningeal artery most typically produces which lesion?
A. Intraventricular hemorrhage
B. Subdural hematoma
C. Subarachnoid hemorrhage
D. Epidural hematoma
D. Epidural hematoma
The middle meningeal artery runs between the inner table of the skull
and the dura, so arterial bleeding collects in the epidural space.
3. Tearing of the bridging veins that cross from the cortex to the dural
venous sinuses most commonly produces which injury?
A. Pituitary apoplexy
B. Cerebellar contusion
C. Epidural hematoma
D. Subdural hematoma
D. Subdural hematoma
Bridging veins traverse the subdural space, so their rupture produces a
venous collection beneath the dura.
4. Which dural fold lies in the longitudinal fissure and separates the
two cerebral hemispheres?
A. Diaphragma sellae
B. Tentorium cerebelli
C. Falx cerebri
D. Falx cerebelli
C. Falx cerebri
The falx cerebri is a sickle-shaped dural reflection lying between the right
and left cerebral hemispheres.
Page 3 of 57
, CAISS Certification
5. The brainstem is made up of which three structures?
A. Midbrain, thalamus and medulla oblongata
B. Cerebellum, pons and medulla oblongata
C. Midbrain, pons and medulla oblongata
D. Thalamus, hypothalamus and pons
C. Midbrain, pons and medulla oblongata
The brainstem consists of the midbrain, pons and medulla; the thalamus
and cerebellum are separate structures.
6. How many vertebrae normally make up the cervical spine?
A. 5
B. 12
C. 7
D. 8
C. 7
There are seven cervical vertebrae (C1 to C7), although there are eight
cervical spinal nerves.
7. The first cervical vertebra, which has no vertebral body, is called the:
A. Axis
B. Odontoid
C. Atlas
D. Vertebra prominens
C. Atlas
C1 is the atlas, a ring-shaped vertebra with anterior and posterior arches
and lateral masses but no body.
8. The odontoid process (dens) is a feature of which vertebra?
A. C1
B. C2
C. C7
D. C3
B. C2
The dens projects upward from the body of C2 (the axis) and articulates
with the anterior arch of C1.
Page 4 of 57
