Convert to ICD-10-CM: 
278.01 converts approximately to:
- 2015/16 ICD-10-CM E66.01 Morbid (severe) obesity due to excess calories
 
 ICD-9-CM Volume 2 Index entries containing back-references to 
278.01:
- Constitutional - see also condition
 - Obesity (constitutional) (exogenous) (familial) (nutritional) (simple) 278.00

morbid 278.01
severe 278.01