CCDS Data Analysis 4 — Questions and Answers
Question 1: Which statistical measure is most appropriate for describing the central tendency of a skewed distribution of patient length-of-stay data?
- Mean
- Median (Correct answer)
- Mode
- Range
Correct answer: Median
The median is preferred over the mean for skewed distributions because it is not distorted by extreme outliers.
Question 2: A hospital's case-mix index (CMI) dropped from 1.85 to 1.72 over one quarter. Which data analysis step should a CDS specialist perform first?
- Immediately retrain all physicians on documentation
- Stratify the CMI decline by service line to identify where the drop occurred (Correct answer)
- Submit a corrective action plan to CMS
- Increase the number of concurrent reviews
Correct answer: Stratify the CMI decline by service line to identify where the drop occurred
Stratifying by service line pinpoints which area drove the CMI decline before any corrective action is taken.
Question 3: In a clinical data quality audit, a CDS specialist finds that 15% of records lack a principal diagnosis. This metric is best classified as a measure of:
- Data timeliness
- Data completeness (Correct answer)
- Data validity
- Data reliability
Correct answer: Data completeness
Completeness measures whether required data elements are present in the record.
Question 4: A CDS program wants to benchmark its query response rate against national standards. Which data source would provide the most relevant external comparison?
- Internal facility historical data
- ACDIS CDI industry survey benchmarks (Correct answer)
- CMS cost reports
- State vital statistics records
Correct answer: ACDIS CDI industry survey benchmarks
ACDIS publishes annual CDI industry surveys that provide national benchmarks for query response and agreement rates.
Question 5: When analyzing physician query agreement rates, a CDS specialist notes that one physician has a 95% agreement rate while the department average is 72%. This finding most likely indicates:
- The physician has excellent documentation skills
- Queries to this physician may be leading or overly directive (Correct answer)
- The department average is unreliable
- The physician should be excluded from future query data
Correct answer: Queries to this physician may be leading or overly directive
An unusually high agreement rate may signal that queries are written in a leading manner, prompting compliance concerns.
Question 6: Which metric directly measures the financial impact of a CDS program on hospital reimbursement?
- Query response rate
- Complication and comorbidity (CC/MCC) capture rate (Correct answer)
- Average length of stay
- Readmission rate
Correct answer: Complication and comorbidity (CC/MCC) capture rate
The CC/MCC capture rate reflects how often higher-severity diagnoses are documented, directly affecting MS-DRG assignment and reimbursement.
Question 7: A CDS specialist is reviewing data showing that mortality-indexed cases have a lower observed-to-expected (O/E) mortality ratio after query intervention. This result indicates:
- The hospital has a higher actual mortality rate than expected
- Documentation improvement has better captured patient severity, lowering the O/E ratio (Correct answer)
- The data is unreliable and should be discarded
- Fewer patients are dying due to CDS program efforts
Correct answer: Documentation improvement has better captured patient severity, lowering the O/E ratio
A lower O/E ratio after documentation improvement means the denominator (expected deaths based on severity) increased, reflecting more accurate severity capture.
CCDS Data Analysis 4
Which statistical measure is most appropriate for describing the central tendency of a skewed distribution of patient length-of-stay data?