What is ICD-10?
The U.S. classification for diagnoses (ICD-10-CM) and hospital inpatient procedures (ICD-10-PCS). See what is ICD-10.
When did ICD-10 replace ICD-9?
October 1, 2015, for services on or after that date, for all entities covered by HIPAA.
Who maintains the codes?
CDC's National Center for Health Statistics maintains ICD-10-CM. CMS maintains ICD-10-PCS.
How often do the codes change?
Every October 1, with possible April updates. Always use the code set in effect on the date of service.
Does ICD-10 replace CPT?
No. CPT® and HCPCS Level II still report physician and outpatient services. ICD-10-PCS is used only on inpatient hospital claims.
Do physician offices use ICD-10-PCS?
No. Physician offices use ICD-10-CM for diagnoses, and CPT and HCPCS for services.
Where can I get the official code files?
The ICD-10-CM files and Official Guidelines are free from CDC/NCHS. ICD-10-PCS files and guidelines are free from CMS.
Which ICD-10-CM manual can I bring to the CPC exam?
AAPC allows an ICD-10-CM manual from any publisher, current or prior year. See the CPC exam.
Sources
Checked Nov 3, 2026. Requirements and fees change, so confirm with the organisation before you register or pay.