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C313-char group

Malignant neoplasm of accessory sinuses

⇄ Primary-code rule changed vs QĐ4469

Coding rules (TT06)

  • ●Avoid — more specific 4-5 char codes exist (see below)

Codes within C31

C31.0Maxillary sinusC31.1Ethmoidal sinusC31.2Frontal sinusC31.3Sphenoidal sinusC31.8Overlapping lesion of accessory sinusesC31.9Accessory sinus, unspecified