| C26 | Malignant neoplasm of other and ill-defined digestive organs Malignant neoplasm of other and ill-defined digestive organs |
| C260 | Malignant neoplasm of intestinal tract, part unspecified |
| C261 | Malignant neoplasm of spleen |
| C269 | Malignant neoplasm of ill-defined sites within the dgstv sys Malignant neoplasm of ill-defined sites within the digestive system |
| C30 | Malignant neoplasm of nasal cavity and middle ear |
| C300 | Malignant neoplasm of nasal cavity |
| C301 | Malignant neoplasm of middle ear |
| C31 | Malignant neoplasm of accessory sinuses |
| C310 | Malignant neoplasm of maxillary sinus |
| C311 | Malignant neoplasm of ethmoidal sinus |
| C312 | Malignant neoplasm of frontal sinus |
| C313 | Malignant neoplasm of sphenoid sinus |
| C318 | Malignant neoplasm of overlapping sites of accessory sinuses Malignant neoplasm of overlapping sites of accessory sinuses |
| C319 | Malignant neoplasm of accessory sinus, unspecified |
| C32 | Malignant neoplasm of larynx |
| C320 | Malignant neoplasm of glottis |
| C321 | Malignant neoplasm of supraglottis |
| C322 | Malignant neoplasm of subglottis |
| C323 | Malignant neoplasm of laryngeal cartilage |
| C328 | Malignant neoplasm of overlapping sites of larynx |
| C329 | Malignant neoplasm of larynx, unspecified |
| C33 | Malignant neoplasm of trachea |
| C34 | Malignant neoplasm of bronchus and lung |
| C340 | Malignant neoplasm of main bronchus |
| C3400 | Malignant neoplasm of unspecified main bronchus |
| C3401 | Malignant neoplasm of right main bronchus |
| C3402 | Malignant neoplasm of left main bronchus |
| C341 | Malignant neoplasm of upper lobe, bronchus or lung |
| C3410 | Malignant neoplasm of upper lobe, unspecified bronchus or lung |
| C3411 | Malignant neoplasm of upper lobe, right bronchus or lung |
| C3412 | Malignant neoplasm of upper lobe, left bronchus or lung |
| C342 | Malignant neoplasm of middle lobe, bronchus or lung |
| C343 | Malignant neoplasm of lower lobe, bronchus or lung |
| C3430 | Malignant neoplasm of lower lobe, unspecified bronchus or lung |
| C3431 | Malignant neoplasm of lower lobe, right bronchus or lung |
| C3432 | Malignant neoplasm of lower lobe, left bronchus or lung |
| C348 | Malignant neoplasm of overlapping sites of bronchus and lung Malignant neoplasm of overlapping sites of bronchus and lung |
| C3480 | Malignant neoplasm of overlapping sites of unspecified bronchus and lung |
| C3481 | Malignant neoplasm of ovrlp sites of right bronchus and lung Malignant neoplasm of overlapping sites of right bronchus and lung |
| C3482 | Malignant neoplasm of overlapping sites of left bronchus and lung |
| C349 | Malignant neoplasm of unspecified part of bronchus or lung |
| C3490 | Malignant neoplasm of unspecified part of unspecified bronchus or lung |
| C3491 | Malignant neoplasm of unspecified part of right bronchus or lung |
| C3492 | Malignant neoplasm of unspecified part of left bronchus or lung |
| C37 | Malignant neoplasm of thymus |
| C38 | Malignant neoplasm of heart, mediastinum and pleura |
| C380 | Malignant neoplasm of heart |
| C381 | Malignant neoplasm of anterior mediastinum |
| C382 | Malignant neoplasm of posterior mediastinum |
| C383 | Malignant neoplasm of mediastinum, part unspecified |