Certified Medical Coding Specialist Research & Evidence-Based Practice 5 — Questions and Answers
Question 1: A coding compliance officer wants to determine whether query response rates differ significantly across three physician specialty groups. The MOST appropriate statistical test is:
- Paired t-test
- One-way ANOVA or chi-square test (Correct answer)
- Linear regression
- Mann-Whitney U test
Correct answer: One-way ANOVA or chi-square test
Comparing a categorical outcome (response rate) across three or more groups calls for a chi-square test; ANOVA is used for continuous outcomes across groups.
Question 2: Which of the following best describes the role of the UHDDS (Uniform Hospital Discharge Data Set) in evidence-based coding practice?
- It defines minimum data elements that must be reported for inpatient encounters (Correct answer)
- It establishes reimbursement rates for DRGs
- It sets the national coding productivity standards
- It governs outpatient E/M level selection
Correct answer: It defines minimum data elements that must be reported for inpatient encounters
UHDDS defines the minimum data elements required for inpatient hospital data reporting, including principal diagnosis and principal procedure.
Question 3: A coder is asked to critically appraise a study's methodology. Finding that the study used a convenience sample of only 30 records from one facility limits which quality dimension?
- Internal validity
- External validity (generalizability) (Correct answer)
- Statistical power
- Measurement reliability
Correct answer: External validity (generalizability)
A small convenience sample from a single facility limits how well the results can be generalized to other facilities or populations (external validity).
Question 4: When a coder uses a clinical decision support tool whose recommendations are based on aggregated peer-reviewed research, this is an example of applying which level of evidence?
- Expert consensus (Level V)
- Research-integrated evidence synthesis (Level II–III) (Correct answer)
- Anecdotal clinical experience (Level VI)
- Single expert opinion (Level IV)
Correct answer: Research-integrated evidence synthesis (Level II–III)
Tools built on aggregated peer-reviewed research represent synthesized evidence at Levels II–III, higher than expert opinion or anecdotal experience.
Question 5: A facility tracks its query compliance rate over 12 months and observes a steady upward trend. The BEST method to visually display this longitudinal trend data is:
- Pie chart
- Run chart (time-series line graph) (Correct answer)
- Bar chart of monthly totals
- Scatter plot of individual coder rates
Correct answer: Run chart (time-series line graph)
A run chart plots data points sequentially over time, making it ideal for identifying trends, shifts, and patterns in longitudinal quality data.
Question 6: A coding researcher uses ICD-10-CM codes to identify a study cohort of patients with sepsis. A key limitation of using administrative claims data for this purpose is:
- Claims data are not available for inpatient stays
- Coding inaccuracies may misclassify patients, introducing selection bias (Correct answer)
- ICD-10-CM codes cannot identify sepsis
- Claims data lack patient demographic information
Correct answer: Coding inaccuracies may misclassify patients, introducing selection bias
Administrative data quality depends on coding accuracy; miscoded diagnoses can cause patients to be incorrectly included or excluded from research cohorts.
Question 7: A HIM director reviews OIG compliance guidance before finalizing an internal audit plan. The primary reason to consult OIG resources is to:
- Obtain official ICD-10-CM code updates
- Identify high-risk billing and coding areas targeted for federal scrutiny (Correct answer)
- Determine CPT code valuation for physician services
- Access benchmark DRG weight data by facility type
Correct answer: Identify high-risk billing and coding areas targeted for federal scrutiny
The OIG Work Plan and compliance guidance identify billing and coding areas with the highest fraud and abuse risk, informing targeted internal audit priorities.
Certified Medical Coding Specialist Research & Evidence-Based Practice 5
A coding compliance officer wants to determine whether query response rates differ significantly across three physician specialty groups.
The MOST appropriate statistical test is: