Recent studies found that hypertension, diabetes, respiratory system disease and cardiovascular disease might be some common comorbidities of COVID-19. As we get more information, we'll have a better idea.
See:
Article Prevalence of comorbidities and its effects in patients infe...
In a pooled analysis of 1458 patients, we found the following: 55.3% HTN (n=226), 31.5% CAD or CVA (n=129), 30.6% diabetes (n=125), hepatitis and liver 8.6% cirrhosis (n=35), 6.6% COPD (n=27), 6.4% malignancy (n=26). The minor contributors included GI diseases, Chronic renal failure, immunodeficiency, and CNS diseases. Hope this helps. Reference: 10.7759/cureus.7560