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ICD-9-CM 330.8 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 330.8 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
F84.2 is a billable ICD code used to specify a diagnosis of rett's syndrome. A 'billable code' is detailed enough to be used to specify a medical diagnosis.