CPC - Anesthesia and Evaluation and Management (10% of the exam) - Section 3.1

Assign anesthesia codes and compute anesthesia time and physical status, applying base units, time units, and qualifying circumstances where relevant.

Select the correct anesthesia code for the surgical procedure performed, append the physical status modifier (P1 to P6), and recognise how base units, reported anesthesia time, and qualifying-circumstance add-on codes combine in the anesthesia formula. Distinguish anesthesia services from moderate (conscious) sedation, and apply the rule that anesthesia for multiple procedures is reported with the single highest base-unit code.

Anesthesia sectionBase units and time unitsPhysical status modifiersQualifying circumstances

Practice question for this objective

Free sampleAnesthesia and Evaluation and Managementhard

An anaesthetist reports a case in which the anaesthesia code carries a base value of 5 units. Anaesthesia time totals 90 minutes, counted as one time unit per 15 minutes, and the patient is assigned physical status P3, which this payer recognises as one modifying unit. Qualifying circumstances do not apply. What is the total number of anaesthesia units reported?

Base value = 5 units
Anaesthesia time = 90 minutes
1 time unit = 15 minutes
P3 = 1 modifying unit

A11 units.
B13 units.
C12 units. Correct
D10 units.

Compute total anaesthesia units as base units plus time units plus any recognised modifying units. The anaesthesia formula sums base units, time units, and any recognised modifying units, so with 90 minutes equal to six time units and P3 adding one modifying unit, the total is five plus six plus one, which is twelve.

Why A is wrong: Tempting if only base and time are added, giving five plus six, but the payer here recognises the P3 physical status as one extra modifying unit, which must be included in the total.

Why B is wrong: Tempting if P3 is counted as two modifying units, but P3 adds only one unit, while the two-unit modifying value belongs to P4 rather than P3.

Why C is correct: Base 5 plus 6 time units for the 90 minutes plus 1 modifying unit for physical status P3 gives five plus six plus one, which equals twelve total units.

Why D is wrong: Tempting if the 90 minutes is divided into five units, but 90 divided by 15 is six time units, and base and physical status are then added on top.

See more CPC practice questions, answers explained.

Exam traps in Anesthesia and Evaluation and Management

Answers that look right on this material and are not. Each one is a distractor from a different question in the CPC bank for this domain.

6 units in total, because the base units are treated as already including the time component.
Why it is wrong: This tempts anyone who thinks base units bundle the duration; but base units reflect only procedure complexity, and time units must be added on top of them.
The base units of every anaesthesia code involved are added together, and the time is then reported separately against each code.
Why it is wrong: Summing every code's base units feels intuitive because more procedures seem like more work; but the guideline forbids stacking base units and instead uses only the highest-valued code.
The patient is rendered fully unconscious with loss of protective reflexes and needs assisted airway management throughout the case.
Why it is wrong: Loss of reflexes and airway support describe general anaesthesia, which is tempting because both involve sedating drugs; but that depth is beyond moderate sedation.

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