When coding guidelines mandate a coding change requiring a 4th or 5th digit code extension and the admitting diagnosis is subject to review will the codes with extension be subject to review?
When a diagnosis code is subject to review and ICD-9-CM coding guidelines mandate a coding change requiring a 4th or 5th digit, the 4th or 5th digit code extension will automatically be subject to review. HFS will not send a notice to providers identifying this type of coding change. Providers were informed of this requirement on the HFS Informational Notice dated 12/01/2004.
