ICD-9-CM 537.4 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 537.4 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
2015 ICD-9-CM Diagnosis Code 537.4 
duodenum 
tuberculous (see also Tuberculosis) 
