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Last Modified: 7/25/2011 Location: FL, PR, USVI Business: Part A, Part B

International Classification of Diseases, 10th Revision (ICD-10) FAQs

Q: What are structural differences between ICD-9-CM and ICD-10-CM diagnosis codes?
A:

ICD-9-CM Diagnosis Codes
ICD-10-CM Diagnosis Codes
3-5 digits
3-7 digits
First digit is alpha (E or V) or numeric; digits 2-5 are numeric
Digit 1 is alpha
Digit 2 is numeric
Digits 3-7 are alpha or numeric
ICD-9-CM Procedure Codes
ICD-10-PCS Procedure Codes
3-4 digits
All digits numeric
7 digits
Each digit is either alpha or numeric (letters O and I are not used to avoid confusion with numbers 0 and 1)
Source: The Centers for Medicare & Medicaid Services -
http://www.cms.gov/ICD10/Downloads/GEMs-CrosswalksTechnicalFAQ.pdf external link to pdf
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