CCDS Respiratory Failure & Vents 4 — Questions and Answers
Question 1: A patient is documented as having 'acute-on-chronic hypoxic respiratory failure.' For CDI purposes, what does this combined term indicate?
- Only the acute component should be coded
- Both the acute and chronic conditions are coded separately (Correct answer)
- The chronic condition is sequenced as principal diagnosis
- The combined term requires physician clarification before coding
Correct answer: Both the acute and chronic conditions are coded separately
Acute-on-chronic respiratory failure is coded with both acute (J96.01) and chronic (J96.11) codes, or the combined code J96.21, per ICD-10-CM guidelines.
Question 2: Which ventilator setting directly controls the volume of air delivered with each breath in volume-controlled ventilation?
- FiO2
- PEEP
- Tidal volume (Correct answer)
- Respiratory rate
Correct answer: Tidal volume
Tidal volume (Vt) is the parameter set by the clinician in volume-controlled modes to determine the amount of air delivered per breath.
Question 3: A CCDS notes a patient on mechanical ventilation for 36 hours. Which CDI action is most appropriate regarding duration-based code assignment?
- No query needed; 36 hours falls in the less-than-96-hour category
- Query the physician to confirm total hours to determine if the 96-hour threshold will be met (Correct answer)
- Assign the greater-than-96-hours code prospectively
- Duration has no impact on mechanical ventilation coding
Correct answer: Query the physician to confirm total hours to determine if the 96-hour threshold will be met
Since 36 hours is approaching the 96-hour threshold (5Z09.3 vs. 5Z09.4 under PCS), the CCDS should monitor and query if the total duration crosses 96 hours.
Question 4: A patient develops respiratory failure secondary to a heroin overdose. What is the correct principal diagnosis sequencing?
- Respiratory failure as principal diagnosis
- Heroin poisoning as principal diagnosis (Correct answer)
- Mechanical ventilation as principal diagnosis
- Hypoxia as principal diagnosis
Correct answer: Heroin poisoning as principal diagnosis
Per ICD-10-CM guidelines for poisoning, the poisoning code (heroin overdose) is sequenced first, with respiratory failure as an additional diagnosis.
Question 5: What does the term 'assist-control ventilation' describe in clinical practice?
- A mode where the patient controls all breaths and the ventilator assists only
- A mode providing a set minimum rate with full ventilator support for every breath, patient-initiated or not (Correct answer)
- A mode that delivers pressure support only for spontaneous breaths
- A mode used exclusively during weaning
Correct answer: A mode providing a set minimum rate with full ventilator support for every breath, patient-initiated or not
Assist-control (AC) delivers a guaranteed minimum number of breaths and provides full support (volume or pressure) for any additional patient-initiated breaths.
Question 6: A patient with COPD is admitted with acute hypercapnic respiratory failure. The provider documents 'COPD exacerbation with respiratory failure.' Which code should be sequenced as principal diagnosis?
- J96.02 – Acute hypercapnic respiratory failure
- J44.1 – COPD with acute exacerbation (Correct answer)
- J44.0 – COPD with acute lower respiratory infection
- J96.90 – Respiratory failure, unspecified
Correct answer: J44.1 – COPD with acute exacerbation
ICD-10-CM guideline I.C.10.a directs that COPD with acute exacerbation (J44.1) is sequenced as principal diagnosis when respiratory failure is also present, unless the respiratory failure is more resource-intensive.
Question 7: Which clinical indicator would most strongly support CDI querying for acute respiratory failure in a patient on supplemental oxygen?
- SpO2 of 95% on 2L nasal cannula
- PaO2 of 55 mmHg on room air with increased work of breathing (Correct answer)
- Respiratory rate of 18 breaths per minute
- Mild expiratory wheezing without accessory muscle use
Correct answer: PaO2 of 55 mmHg on room air with increased work of breathing
A PaO2 of 55 mmHg with increased work of breathing meets clinical criteria for acute hypoxic respiratory failure and supports a CDI query.
CCDS Respiratory Failure & Vents 4
A patient is documented as having 'acute-on-chronic hypoxic respiratory failure.' For CDI purposes, what does this combined term indicate?