R09.0Asphyxia and hypoxemia

R09.0 is the ICD-10-CM diagnosis code for asphyxia and hypoxemia. It belongs to category R09 (other symptoms and signs involving the circulatory and respiratory system), block R00-R09 (symptoms and signs involving the circulatory and respiratory systems) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within R09 (other symptoms and signs involving the circulatory and respiratory system), R09.0 is specifically for asphyxia and hypoxemia. Related codes cover pleurisy (R09.1), respiratory arrest (R09.2), abnormal sputum (R09.3), other specified symptoms and signs involving the circulatory and respiratory systems (R09.8) and foreign body sensation of the circulatory and respiratory system (R09.A).

To report this condition, pick the subcode that matches the documentation: R09.01 (asphyxia) and R09.02 (hypoxemia).

Don't report R09.0 together with the conditions in its Excludes1 note: asphyxia due to carbon monoxide (T58.-), asphyxia due to foreign body in respiratory tract (T17.-), birth (intrauterine) asphyxia (P84), hyperventilation (R06.4) and 1 more.

The conditions in its Excludes2 note aren't part of R09.0, but may be coded alongside it if the patient has both: hypercapnia (R06.89).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.