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Ch. XI
ICD-10
Ch. XI
K21
K21
3-char group
Gastro-oesophageal reflux disease
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⇄ Primary-code rule changed vs QĐ4469
Coding rules (TT06)
●
Avoid — more specific 4-5 char codes exist (see below)
Codes within K21
K21.0
Gastro-oesophageal reflux disease with oesophagitis
K21.9
Gastro-oesophageal reflux disease without oesophagitis
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