According to ICD9Data.com, the correct code for a headache is 784.0. This code will be replaced with a new code on Oct. 1, 2015, when the new ICD-10 system is put into place across the United States.
According to ICD9Data.com, the code 784.0 is a billable medical code that can be specified as a diagnosis on medical bills. This code can be used to send to insurance companies for reimbursement purposes as well. Code 784.0 is not very specific and can be utilized for a variety of diseases such as chronic daily headaches, chronic facial pain, occipital headache, sinus headache or epidural-induced headache states ICD-9 Data.