S52.21 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Greenstick fracture of shaft of ulna.
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The appropriate 7th character is to be added to all codes in subcategory S52.21
A: initial encounter for closed fracture
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
S: sequela
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