Hello Shashi,
Kindly find the rationale to above query according to AHA.
Assign code J44.89, Other specified chronic obstructive pulmonary disease, for a patient with asthma and COPD. A separate code for asthma should not be assigned unless the type of asthma is specified, or the asthma is exacerbated.
The instructional note under category J44, Other chronic obstructive pulmonary disease, states “code also type of asthma, if applicable (J45-).” Therefore, it would be appropriate to separately report a code for the specific type of asthma and/or asthma exacerbation when documented. Although asthma exacerbation does not specify a type of asthma, it does provide additional specificity (acuity) regarding the asthma. Do not assign code J45.909, Unspecified asthma, uncomplicated, when the type of asthma is not further specified. “Unspecified” is not considered a type of asthma.