R06.4 vs R09.0
R06.4 and R09.0 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on R09.0
hyperventilation (R06.4)
R06.4
Hyperventilation
Billable
- Chapter 18
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Section
- R00-R09
Indexed under
- Hyperventilation (tetany)
- Dyspnea › hyperventilation (nocturnal) (paroxysmal)
- Tetany › hyperpnea (due to)
- Tetany › hyperventilation (due to)
R09.0
Asphyxia and hypoxemia
Not billable
- Chapter 18
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Section
- R00-R09
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027