Chapter 2

C00–D49: Neoplasms

Neoplasms diagnostic classification updated for 2026.

Internal Codes
  • C31|

    Malignant neoplasm of accessory sinuses

  • C31.0|

    Malignant neoplasm of maxillary sinus

  • C31.1|

    Malignant neoplasm of ethmoidal sinus

  • C31.2|

    Malignant neoplasm of frontal sinus

  • C31.3|

    Malignant neoplasm of sphenoid sinus

  • C31.8|

    Malignant neoplasm of overlapping sites of accessory sinuses

  • C31.9|

    Malignant neoplasm of accessory sinus, unspecified

  • C32|

    Malignant neoplasm of larynx

  • C32.0|

    Malignant neoplasm of glottis

  • C32.1|

    Malignant neoplasm of supraglottis

  • C32.2|

    Malignant neoplasm of subglottis

  • C32.3|

    Malignant neoplasm of laryngeal cartilage

  • C32.8|

    Malignant neoplasm of overlapping sites of larynx

  • C32.9|

    Malignant neoplasm of larynx, unspecified

  • C33|

    Malignant neoplasm of trachea

  • C34|

    Malignant neoplasm of bronchus and lung

  • C34.0|

    Malignant neoplasm of main bronchus

  • C34.00|

    Malignant neoplasm of unspecified main bronchus

  • C34.01|

    Malignant neoplasm of right main bronchus

  • C34.02|

    Malignant neoplasm of left main bronchus

  • C34.1|

    Malignant neoplasm of upper lobe, bronchus or lung

  • C34.10|

    Malignant neoplasm of upper lobe, unspecified bronchus or lung

  • C34.11|

    Malignant neoplasm of upper lobe, right bronchus or lung

  • C34.12|

    Malignant neoplasm of upper lobe, left bronchus or lung

  • C34.2|

    Malignant neoplasm of middle lobe, bronchus or lung

  • C34.3|

    Malignant neoplasm of lower lobe, bronchus or lung

  • C34.30|

    Malignant neoplasm of lower lobe, unspecified bronchus or lung

  • C34.31|

    Malignant neoplasm of lower lobe, right bronchus or lung

  • C34.32|

    Malignant neoplasm of lower lobe, left bronchus or lung

  • C34.8|

    Malignant neoplasm of overlapping sites of bronchus and lung

  • C34.80|

    Malignant neoplasm of overlapping sites of unspecified bronchus and lung

  • C34.81|

    Malignant neoplasm of overlapping sites of right bronchus and lung

  • C34.82|

    Malignant neoplasm of overlapping sites of left bronchus and lung

  • C34.9|

    Malignant neoplasm of unspecified part of bronchus or lung

  • C34.90|

    Malignant neoplasm of unspecified part of unspecified bronchus or lung

  • C34.91|

    Malignant neoplasm of unspecified part of right bronchus or lung

  • C34.92|

    Malignant neoplasm of unspecified part of left bronchus or lung

  • C37|

    Malignant neoplasm of thymus

  • C38|

    Malignant neoplasm of heart, mediastinum and pleura

  • C38.0|

    Malignant neoplasm of heart

  • C38.1|

    Malignant neoplasm of anterior mediastinum

  • C38.2|

    Malignant neoplasm of posterior mediastinum

  • C38.3|

    Malignant neoplasm of mediastinum, part unspecified

  • C38.4|

    Malignant neoplasm of pleura

  • C38.8|

    Malignant neoplasm of overlapping sites of heart, mediastinum and pleura

  • C39|

    Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs

  • C39.0|

    Malignant neoplasm of upper respiratory tract, part unspecified

  • C39.9|

    Malignant neoplasm of lower respiratory tract, part unspecified

  • C40|

    Malignant neoplasm of bone and articular cartilage of limbs

  • C40.0|

    Malignant neoplasm of scapula and long bones of upper limb

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