Just received this:
•The compliance dates are firm and not subject to change.
•There will be no delays.
•There will be no grace period for implementation.
Important, please be aware:
•ICD-9-CM codes will not be accepted for services provided on or after October 1, 2013.
•ICD-10 codes will not be accepted for services prior to October 1, 2013.
You must begin using the ICD-10-CM codes to report diagnoses from all ambulatory and physician services on claims with dates of service on or after October 1, 2013, and for all diagnoses on claims for inpatient settings with dates of discharge that occur on or after October 1, 2013.
Additionally, you must begin using the ICD-10-PCS (procedure codes) for all hospital claims for inpatient procedures on claims with dates of discharge that occur on or after October 1, 2013.
Note: Only ICD-10-CM, not ICD-10-PCS, will affect physicians. ICD-10-PCS will only be implemented for facility inpatient reporting of procedures – it will not be used for physician reporting. There will be no impact on Current Procedural Terminology (CPT) and Healthcare Common Procedure Coding System (HCPCS) codes. You should continue to use these codes for physician, outpatient, and ambulatory services. Physician claims for services provided to inpatient patients will continue to report CPT and HCPCS codes.
http://www.cms.gov/MLNMattersArticles/downloads/SE1019.pdf