AAPC Certified Professional Coder (CPC) — All Questions

The same surgeon performs several distinct surgical procedures through separate incisions during one operative session. Which modifier identifies the second and subsequent procedures so the payer can apply the multiple-procedure fee reduction?

• a.Modifier -51 (Multiple procedures)✓
• b.Modifier -50 (Bilateral procedure)
• c.Modifier -59 (Distinct procedural service)
• d.Modifier -22 (Increased procedural services)

Modifier -51 tells the payer that more than one procedure was performed in the same session by the same provider, so payment ranking (100% for the highest-valued, reduced for the rest) can be applied. -50 is only for mirror-image bilateral procedures, -59 unbundles services that are normally packaged together, and -22 signals substantially greater work than usual. Do not confuse the multiple-procedure concept (-51) with unbundling (-59).

When selecting a CPT code for excision of a benign skin lesion, how is the size determined?

• a.The greatest clinical diameter of the lesion plus the narrowest margin required, measured before excision✓
• b.The diameter of the specimen as measured by pathology after fixation
• c.The diameter of the lesion alone, ignoring surgical margins
• d.The total surface area of skin removed, including the repair

Excised diameter equals the lesion's greatest clinical diameter plus the most narrow margins needed on each side, and it must be measured before removal because formalin fixation shrinks tissue. Coding from the pathology report understates the true size. Margins are part of excision sizing, and the closure (repair) is coded separately when it rises to intermediate/complex.

A CPT surgical code carries the parenthetical designation '(separate procedure).' What does this tell the coder?

• a.The procedure is always billed separately in addition to any other service
• b.It is bundled when performed as an integral part of a larger procedure, but may be reported when it is the only service or is unrelated/distinct✓
• c.It always requires modifier -50
• d.It is never reimbursable under any circumstance

'Separate procedure' means the service is considered an inherent component of a more comprehensive procedure and is not billed when performed at the same site/session as that larger procedure. It becomes reportable only when performed alone or on a different site/session — often supported by modifier -59 or an appropriate X{EPSU} modifier.

For a major surgery with a 90-day global period, which of the following is INCLUDED in the global surgical package and NOT separately reportable?

• a.The operation, the related preoperative E/M on the day before or day of surgery, and routine postoperative care during the 90 days✓
• b.Treatment of an unrelated new illness during the postoperative period
• c.A staged or planned return to the operating room decided in advance
• d.Diagnostic tests and studies needed to establish the surgical diagnosis

The global package bundles the procedure itself, the related pre-op visit the day before/of surgery, intraoperative work, and normal follow-up care through the global window. Unrelated care (modifier -24/-79), staged procedures (-58), and the diagnostic work-up that led to the decision for surgery fall outside the package and are separately payable.

Under the current (2021 and later) office/outpatient E/M guidelines, how is the level of service selected?

• a.By counting history bullets and examination elements
• b.By either the total time spent on the date of the encounter OR the level of medical decision making (MDM)✓
• c.By the number of organ systems reviewed in the ROS
• d.By the severity of the chief complaint alone

The 2021 overhaul removed history and exam as the drivers of office/outpatient visit level. Coders now choose based on MDM or on total time on the date of service (face-to-face plus non-face-to-face work by the physician/QHP). History and exam are still documented for clinical care but no longer determine the code.

The level of medical decision making (MDM) is determined by three elements. Which set correctly names them?

• a.History, examination, and time
• b.Number and complexity of problems addressed; amount and/or complexity of data reviewed and analyzed; and risk of complications/morbidity of management✓
• c.Chief complaint, review of systems, and past/family/social history
• d.Coordination of care, counseling, and nature of the presenting problem

MDM is scored across three columns — problems addressed, data reviewed/analyzed (labs, notes, independent interpretation, discussion with other providers), and risk. The overall level is set by meeting or exceeding two of the three elements. The older history/exam bullets and the 1995/1997 audit approach no longer apply to office visits.

When is modifier -25 correctly appended to an E/M service?

• a.When a significant, separately identifiable E/M is performed by the same provider on the same day as a minor procedure or other service with a global period✓
• b.When the E/M is the only service billed that day
• c.When a physician requests a consultation from a specialist
• d.When reporting a preventive medicine (wellness) visit

Modifier -25 unbundles an E/M that stands on its own from a same-day procedure that carries its own inherent pre/post work. The E/M must be above and beyond the usual work associated with the procedure and supported by separate documentation. It is never used simply to get an office visit paid when no other service was performed.

How is the payment for an anesthesia service calculated?

• a.(Base units + time units + modifying units) multiplied by a locality conversion factor✓
• b.A single flat fee per anesthesia case regardless of duration
• c.Work RVU multiplied by the geographic practice cost index only
• d.A percentage of the surgeon's fee for the procedure

Anesthesia uses base units (assigned to each anesthesia CPT code by procedure complexity) plus time units (typically each 15 minutes) plus any modifying units (physical status P3-P5, qualifying circumstances), all multiplied by an anesthesia conversion factor. This unit-and-time model is unique to anesthesia and differs from the RVU method used for most other services.

The anesthesia physical status modifier P3 describes which patient?

• a.A normal, healthy patient
• b.A patient with mild systemic disease
• c.A patient with severe systemic disease✓
• d.A moribund patient not expected to survive without the operation

Physical status modifiers P1-P6 grade the patient's condition: P1 normal healthy, P2 mild systemic disease, P3 severe systemic disease, P4 severe systemic disease that is a constant threat to life, P5 moribund, P6 brain-dead organ donor. P3, P4, and P5 typically add modifying units because they reflect increased anesthesia risk and complexity.

Which situation is reported with an anesthesia qualifying circumstances add-on code?

• a.Routine anesthesia for a healthy adult elective procedure
• b.Anesthesia complicated by extreme age (younger than 1 year or older than 70)✓
• c.Standard monitored anesthesia care for a screening endoscopy
• d.Local anesthesia administered by the operating surgeon

Qualifying circumstances describe conditions that significantly raise anesthesia complexity — extreme age, use of total body hypothermia or controlled hypotension, and emergency conditions. They are add-on codes reported in addition to the primary anesthesia code. Routine cases and surgeon-administered local anesthesia do not qualify.

A radiologist reads films taken at a hospital and dictates the report, but does not own the equipment. Which modifier reports only the physician's work?

• a.Modifier -26 (professional component)✓
• b.Modifier -TC (technical component)
• c.No modifier — the global service is reported
• d.Modifier -76 (repeat procedure)

Many radiology codes split into a professional component (the physician's supervision, interpretation, and written report — modifier -26) and a technical component (equipment, supplies, technologist — modifier -TC). When the physician only interprets, append -26; the facility bills -TC. Reporting the code with no modifier claims the global (both components), which would be incorrect here.

A CPT code describes a 'complete' ultrasound of the abdomen. What must the documentation support to use the complete study code rather than a limited study?

• a.Imaging of a single organ of interest
• b.Evaluation and documentation of all required elements for that complete exam (for the complete abdomen: liver, gallbladder, common bile duct, pancreas, spleen, kidneys, and the upper abdominal aorta and inferior vena cava)✓
• c.Only the kidneys, because they are the largest structures imaged
• d.Only the clinical indication for the study

'Complete' ultrasound codes require that every anatomic element listed in the CPT guidelines be examined and documented. If the study images fewer than all required structures, or targets a single organ/quadrant, it is a 'limited' study. Coding a complete exam without the full documented survey is an overcode.

In CPT radiology, when a code specifies 'with contrast,' contrast material must be administered by which route(s)?

• a.Orally or rectally only
• b.Intravascularly, intra-articularly, or intrathecally (oral or rectal contrast alone does NOT satisfy 'with contrast')✓
• c.Any route, including oral, so long as any contrast is used
• d.Topically on the skin surface

CPT defines 'with contrast' as contrast given intravascularly, intra-articularly, or intrathecally. Contrast given only by mouth or rectum is coded as 'without contrast.' A study that starts without contrast and then adds IV contrast is coded 'without contrast followed by with contrast.' Knowing the route prevents miscoding CT/MR studies.

When may an organ- or disease-oriented laboratory panel (for example, a basic metabolic panel) be reported with its panel code?

• a.When at least one component test in the panel is performed
• b.Only when every component test listed in that panel is performed✓
• c.Whenever the physician orders it by name, regardless of which tests are run
• d.When any two of the component tests are performed

Panels are all-or-nothing: the panel code may be reported only if ALL of its defined component tests are performed. If only some components are done, you report the individual test codes instead. Reporting a panel when a component was not performed is unbundling in reverse and is inaccurate coding.

A pathologist performs the microscopic examination of a surgical specimen and renders the diagnosis in a written report. This physician work represents which component of the service?

• a.The technical component
• b.The professional component✓
• c.The global service, which cannot be split
• d.A service that is never separately reportable

Surgical pathology, like radiology, can split into technical (specimen accessioning, tissue processing, slide preparation) and professional (the pathologist's microscopic interpretation and diagnostic report) components. The pathologist's interpretive work is the professional component, reported with modifier -26 when the lab bills the technical portion separately.

A clinician orders serial potassium levels drawn several hours apart on the same date to monitor a patient. Which modifier is appended to the repeat laboratory tests?

• a.Modifier -91 (repeat clinical diagnostic laboratory test)✓
• b.Modifier -76 (repeat procedure by the same physician)
• c.Modifier -59 (distinct procedural service)
• d.Modifier -26 (professional component)

Modifier -91 is specific to laboratory tests intentionally repeated on the same day to obtain successive (serial) results — a medically necessary trend, not a re-run of a bad specimen. -76 applies to repeated procedures/services (e.g., imaging), not to clinical lab. Using -91 correctly distinguishes legitimate serial testing from duplicate billing.

Two services are ordinarily bundled under NCCI edits, but on this encounter they were performed at separate sites and are genuinely independent. No more specific modifier applies. Which modifier may be appropriate?

• a.Modifier -59 (distinct procedural service)✓
• b.Modifier -22 (increased procedural services)
• c.Modifier -50 (bilateral procedure)
• d.Modifier -26 (professional component)

Modifier -59 unbundles services that NCCI normally pairs together when documentation shows a distinct session, site, lesion, or organ system. It should be used only when no more precise modifier (such as anatomical X{EPSU} modifiers -XE, -XS, -XP, -XU) applies. -59 must never be used simply to bypass an edit for reimbursement without clinical justification.

A psychiatrist provides both a medical E/M service and psychotherapy to the same patient during one encounter. How is this reported?

• a.Report the E/M based on MDM and the psychotherapy add-on based on its own separately documented time, with the two work efforts kept distinct✓
• b.Report a single combined code that covers both
• c.Report only the E/M service and disregard the psychotherapy
• d.Append modifier -50 to the psychotherapy code

Psychotherapy add-on codes are used with an E/M when both services are provided. The E/M is leveled by MDM (time cannot be used because the psychotherapy time is carved out), and the psychotherapy is chosen by its own documented time. The clinician must be able to separate the medical and therapy work in the note.

A nurse administers an influenza vaccine to an established patient in the clinic. What must be coded to fully capture the service?

• a.Only the vaccine/toxoid product code
• b.Both the vaccine/toxoid product code and the immunization administration code✓
• c.Only the immunization administration code
• d.A separate E/M visit for each vaccine given

Immunizations require two codes: the product (the specific vaccine/toxoid) and the administration (how it was given, e.g., percutaneous/intramuscular, with or without counseling for younger patients). Reporting only one undercodes the encounter. A separate E/M with modifier -25 is added only when a significant, separately identifiable evaluation was also performed.

In ICD-10-CM inpatient coding, the principal diagnosis is defined as:

• a.The condition established after study to be chiefly responsible for occasioning the admission✓
• b.Any chronic condition the patient carries
• c.Whichever diagnosis is easiest to assign a code to
• d.The comorbidity with the highest severity of illness

The principal diagnosis is the condition determined, after study, to be chiefly responsible for the admission. In the outpatient setting the parallel concept is the 'first-listed' diagnosis — the reason chiefly responsible for the visit. Accurate sequencing drives reimbursement and data integrity, so this definition is foundational to ICD-10-CM.

When is the placeholder character 'X' required in an ICD-10-CM code?

• a.When a code requires a 7th character but has fewer than 6 characters, 'X' fills the empty positions so the 7th character lands in the correct place✓
• b.It is never used in ICD-10-CM
• c.It is added to the end of every injury code
• d.It is used to indicate a bilateral condition

ICD-10-CM uses 'X' as a placeholder to hold empty character positions so that a required 7th character (for example A, D, or S on injury/external-cause codes) occupies the seventh slot. Omitting the placeholder makes the code invalid. The placeholder has no clinical meaning of its own — it is purely structural.

Which federal law makes it illegal to knowingly submit, or cause the submission of, false or fraudulent claims to Medicare or Medicaid?

• a.The HIPAA Privacy Rule
• b.The False Claims Act✓
• c.The Emergency Medical Treatment and Labor Act (EMTALA)
• d.The Clinical Laboratory Improvement Amendments (CLIA)

The False Claims Act imposes civil liability (and treble damages/penalties) for knowingly presenting false claims to the government, and it underpins much of coding compliance. The HIPAA Privacy Rule governs protected health information, EMTALA governs emergency screening/stabilization, and CLIA governs laboratory quality — none of which is the anti-false-claims statute.