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A code is invalid if it has not been coded to the full number of characters required. This does not mean that all ICD-10 codes must have 7 characters. The 7th character is only used in certain chapters to provide data about the characteristic of the encounter. Examples of where the 7th character can be used include injuries and fractures, as illustrated in the following tables:
Injuries and External Causes Fractures
Value Description Value Description
A Initial encounter A Initial encounter for closed fracture
D Subsequent encounter B Initial encounter for open fracture
S Sequela D Subsequent encounter for fracture with routine healing
G Subsequent encounter for fracture with delayed healing
K Subsequent encounter for fracture with nonunion
P Subsequent encounter for fracture with malunion https://www.aamc.org/download/261212/data/faqsonicd-10.pdf
S Sequela