The Centers for Medicare and Medicaid Services, the agency responsible for maintaining the inpatient procedure code set in the U.S., contracted with 3M Health Information Systems in 1995 to design and then develop a procedure classification system to replace Volume 3 of ICD-9-CM.
[1] Despite being named after the WHO's International Classification of Diseases, it is a US-developed standard which is not used outside the United States.
The letters O and I are excluded to avoid confusion with the numbers 0 and 1.
[3] There are no decimals in ICD-10-PCS[4] Of the 72,081 codes in ICD-10-PCS, 62,022 are in the first section, "Medical and surgical".
[5] For medical/surgical, these are the root operation codes: 00 alteration; 01 bypass; 02 change; 03 control; 04 creation; 05 destruction; 06 detachment; 07 dilation; 08 division; 09 drainage; 0B excision; 0C extirpation; 0D extraction; 0F fragmentation; 0G fusion; 0H insertion; 0J inspection; 0K map; 0L occlusion; 0M reattachment; 0N release; 0P removal; 0Q repair; 0R replacement; 0S reposition; 0T resection; 0U supplement; 0V restriction; 0W revision; 0X transfer; 0Y transplantation They can be grouped into several categories:[5]