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The International Classification of Diseases for Oncology (ICD-O) is a domain specific extension of the International Statistical Classification of Diseases and Related Health Problems for tumor diseases. This classification is widely used by cancer registries.

It is currently in its third revision.

Contents 1 Axes 1.1 Morphology 1.1.1 Examples of codes 1.1.1.1 (8000-8009) Not otherwise specified 1.1.1.2 (8010-8790) Epithelial 1.1.1.3 (8800-9370) Connective tissue 1.1.1.4 (9380-9589) Nervous system 1.1.1.5 (9590-9999) Hematologic (Leukemias, Lymphomas and related disorders) 1.1.1.6 -- Lymphoid leukemias, and related conditions 1.1.1.7 -- Myeloid leukemias, and related conditions 1.1.1.8 -- Other 1.2 Topography 2 See also 3 External links 3.1 Morphology

The classification has two axes:

The morphology axis is for the morphology of the tumor.

This axis has additional importance, because the Systematized Nomenclature of Medicine has adopted ICD-O's classification of morphology.

• (8000-8004) Neoplasms, NOS
  • (M8000/0) Neoplasm, benign
  • (M8000/1) Neoplasm, uncertain whether benign or malignant
  • (M8000/3) Neoplasm, malignant
  • (M8000/6) Neoplasm, metastatic
  • (M8000/9) Neoplasm, malignant, uncertain whether primary or metastatic

• (8010-8040) Epithelial neoplasms, NOS
• (8050-8080) Squamous cell neoplasms
  • (M8070/3) Squamous cell carcinoma, NOS
• (8090-8110) Basal cell neoplasms
  • (M8090/3) Basal cell carcinoma, NOS
• (8120-8130) Transitional cell Papillomas And Carcinomas
• (8140-8380) Adenomas And Adenocarcinomas (glands)
  • (M8140/0) Adenoma, NOS
  • (M8140/3) Adenocarcinoma, NOS
  • (M8142/3) Linitis plastica
  • (M8151/0) Insulinoma, NOS
  • (M8152/0) Glucagonoma, NOS
  • (M8153/1) Gastrinoma, NOS
  • (M8155/3) Vipoma
  • (M8160/3) Cholangiocarcinoma
  • (M8170/3) Hepatocellular carcinoma, NOS
  • (M8200/3) Adenoid cystic carcinoma
  • (M8240/1) Carcinoid tumor, NOS, of appendix
  • (M8271/0) Prolactinoma
  • (M8290/0) Oncocytoma
  • (M8290/0) Hurthle cell adenoma
  • (M8312/3) Renal cell carcinoma
  • (M8312/3) Grawitz tumor
  • (M8360/1) Multiple endocrine adenomas
  • (M8380/0) Endometrioid adenoma, NOS
• (8390-8420) Adnexal And Skin appendage Neoplasms
• (8430-8439) Mucoepidermoid Neoplasms
• (8440-8490) Cystic, Mucinous And Serous Neoplasms
  • (M8440/0) Cystadenoma, NOS
  • (M8480/6) Pseudomyxoma peritonei
• (8500-8540) Ductal, Lobular And Medullary Neoplasms
• (8550-8559) Acinar cell neoplasms
• (8560-8580) Complex epithelial neoplasms
  • (M8561/0) Warthin's tumor
  • (M8580/0) Thymoma, NOS
• (8590-8670) Specialized gonadal neoplasms
  • (M8590/1) Sex cord-stromal tumor
  • (M8600/0) Thecoma, NOS
  • (M8620/1) Granulosa cell tumor, NOS
  • (M8630/1) Arrhenoblastoma, NOS
  • (M8631/0) Sertoli-Leydig cell tumor
• (8680-8710) Paragangliomas And Glomus tumors
  • (M8680/1) Paraganglioma, NOS
  • (M8700/0) Pheochromocytoma, NOS
  • (M8711/0) Glomus tumor
• (8720-8790) Nevi And Melanomas
  • (M8720/0) Melanocytic nevus
  • (M8720/3) Malignant melanoma, NOS
  • (M8720/3) Melanoma, NOS
  • (M8721/3) Nodular melanoma
  • (M8727/0) Dysplastic nevus
  • (M8742/3) Lentigo maligna melanoma
  • (M8743/3) Superficial spreading melanoma
  • (M8744/3) Acral lentiginous melanoma, malignant

• (8800-8809) Soft tissue Tumors And Sarcomas, Nos
  • (M8800/3) Sarcoma, NOS
  • (M8800/3) Soft tissue sarcoma
  • (M8806/3) Desmoplastic small round cell tumor

• (8810-8830) Fibromatous neoplasms
  • (M8810/0) Fibroma, NOS
  • (M8810/3) Fibrosarcoma, NOS

• (8840-8849) Myxomatous neoplasms
  • (M8840/0) Myxoma, NOS

• (8850-8880) Lipomatous neoplasms
  • (M8850/0) Lipoma, NOS
  • (M8850/3) Liposarcoma, NOS

• (8890-8920) Myomatous neoplasms
  • (M8890/0) Leiomyoma, NOS
  • (M8890/3) Leiomyosarcoma, NOS
  • (M8895/0) Myoma
  • (M8895/3) Myosarcoma
  • (M8900/0) Rhabdomyoma, NOS
  • (M8900/3) Rhabdomyosarcoma, NOS

• (8930-8990) Complex Mixed And Stromal Neoplasms
  • (M8940/0) Pleomorphic adenoma
  • (M8960/3) Nephroblastoma, NOS (Wilms's tumor)

• (9000-9030) Fibroepithelial Neoplasms
  • (M9000/0) Brenner tumor, NOS

• (9040-9049) Synovial-Like Neoplasms
  • (M9040/3) Synovial sarcoma, NOS

• (9050-9059) Mesothelial Neoplasms
  • (M9050/0) Mesothelioma, benign
  • (M9050/3) Mesothelioma, NOS

• (9060-9090) Germ cell Neoplasms
  • (M9060/3) Dysgerminoma
  • (M9064/3) Germ cell tumor, NOS
  • (M9070/3) Embryonal carcinoma, NOS
  • (M9071/3) Yolk sac tumor
  • (M9080/0) Teratoma, benign
  • (M9080/3) Teratoma, malignant, NOS
  • (M9084/0) Dermoid cyst, NOS

• (9100-9109) Trophoblastic neoplasms
  • (M9100/3) Choriocarcinoma, NOS

• (9110-9119) Mesonephromas
• (9120-9160) Blood vessel tumors
  • (M9120/0) Hemangioma, NOS
  • (M9120/0) Angioma, NOS
  • (M9120/3) Hemangiosarcoma
  • (M9120/3) Angiosarcoma
  • (M9130/0) Hemangioendothelioma, benign
  • (M9130/1) Hemangioendothelioma, NOS
  • (M9140/3) Kaposi's sarcoma
  • (M9150/0) Hemangiopericytoma, benign
  • (M9150/1) Hemangiopericytoma, NOS

• (9170-9179) Lymphatic vessel tumors
  • (M9170/0) Lymphangioma, NOS
  • (M9173/0) Cystic lymphangioma

• (9180-9240) Osseous And Chondromatous neoplasms
  • (M9180/0) Osteoma, NOS
  • (M9180/3) Osteosarcoma, NOS
  • (M9210/0) Osteochondroma
  • (M9210/0) Cartilaginous exostosis
  • (M9220/0) Chondroma, NOS
  • (M9220/3) Chondrosarcoma, NOS

• (9250-9259) Giant cell tumors
• (9260-9269) Miscellaneous bone tumors
  • (M9260/3) Ewing's sarcoma

• (9270-9340) Odontogenic tumors
  • (M9273/0) Cementoblastoma, benign
  • (M9310/0) Ameloblastoma, NOS

• (9350-9370) Miscellaneous tumors
  • (M9350/1) Craniopharyngioma

• (9380-9480) Gliomas
  • (M9382/3) Mixed oligoastrocytoma
  • (M9391/3) Ependymoma, NOS
  • (M9400/3) Astrocytoma, NOS
    • (9421/3) Pilocytic astrocytoma
    • (9440/3) Glioblastoma multiforme
  • (M9450/3) Oligodendroglioma, NOS

• (9490-9520) Neuroepitheliomatous neoplasms
  • (M9500/3) Neuroblastoma, NOS
  • (M9510/3) Retinoblastoma

• (9530-9539) Meningiomas

• (9540-9570) Nerve sheath tumors
  • (M9540/0) Neurofibroma, NOS
  • (M9540/1) Neurofibromatosis, NOS
  • (M9560/0) Schwannoma, NOS
  • (M9560/0) Neurinoma
  • (M9560/0) Acoustic neuroma
  • (M9570/0) Neuroma, NOS

• (9580-9589) Granular cell tumors and Alveolar soft part sarcoma

• (9590-9599) Malignant lymphoma, NOS, Or diffuse
  • (M9590/3) Lymphoma, NOS
  • (M9591/3) Non-Hodgkin's lymphoma, NOS
  • (M9592/3) Lymphosarcoma, NOS

• (9650-9660) Hodgkin's disease
  • (M9650/3) Hodgkin's disease, NOS
  • (M9651/3) Lymphocyte-rich classical Hodgkin lymphoma
  • (M9652/3) Mixed cellularity classical Hodgkin lymphoma
  • (M9653/3) Lymphocyte-depleted classical Hodgkin lymphoma
  • (M9659/3) Nodular lymphocyte predominant Hodgkin lymphoma
  • (M9663/3) Nodular sclerosis classical Hodgkin lymphoma

• (9670-9680) Malignant lymphoma Specified Type, Diffuse Or Nos
  • (M9670/3) Small lymphocytic lymphoma
  • (M9671/3) Lymphoplasmacytic lymphoma
  • (M9673/3) Mantle cell lymphoma
  • (M9678/3) Primary effusion lymphoma
  • (M9679/3) Mediastinal (thymic) large cell lymphoma
  • (M9680/3) Diffuse large B-cell lymphoma or Intravascular large B-cell lymphoma
  • (M9687/3) Burkitt lymphoma
  • (M9689/3) Splenic marginal zone lymphoma

• (9690-9699) Malignant lymphoma, Follicular Or Nodular, With Or Without diffuse areas
  • (M9690/3) Follicular lymphoma
  • (M9698/3) Follicular lymphoma
  • (M9699/3) Extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue (MALT-lymphoma)
  • (M9699/3) Nodal marginal zone B-cell lymphoma

• (9700-9709) Specified Cutaneous And Peripheral T-Cell Lymphomas
  • (M9700/3) Mycosis fungoides
  • (M9701/3) Sezary syndrome
  • (M9702/3) Peripheral T-cell lymphoma, unspecified
  • (M9705/3) Angioimmunoblastic T-cell lymphoma
  • (M9708/3) Subcutaneous panniculitis-like T-cell lymphoma

• (9710-9719) Other Specified Non-Hodgkin's lymphomas
  • (M9714/3) Anaplastic large cell lymphoma
  • (M9716/3) Hepatosplenic T-cell lymphoma
  • (M9717/3) Enteropathy type T-cell lymphoma
  • (M9718/1) Lymphomatoid papulosis
  • (M9718/3) Primary cutaneous anaplastic large cell lymphoma
  • (M9719/3) Extranodal NK/T cell lymphoma, nasal type

• (9720-9729) Other Lymphoreticular neoplasms
  • (M9727/3) Blastic NK cell lymphoma
  • (M9728/3) Lymphoma
  • (M9729/3) Lymphoma

• (9730-9739) Plasma cell tumors
  • (M9731/3) Plasmacytoma, NOS or Extramedullary plasmacytoma or Solitary plasmacytoma of bone
  • (M9732/3) Multiple myeloma or Plasma cell myeloma
  • (M9734/3) Extraosseous plasmacytoma

• (9740-9749) Mast cell Tumors
  • (M9740/1) Mastocytoma, NOS or Extracutaneous mastocytoma
  • (M9740/3) Mast cell sarcoma
  • (M9741/1) Malignant mastocytosis or Indolent systemic mastocytosis
  • (M9741/3) Aggressive systemic mastocytosis or Systemic mastocytosis with associated clonal, hematological non-mast cell lineage disease
  • (M9742/3) Mast cell leukemia
  • (M9751/1) Langerhans cell histiocytosis
  • (M9755/3) Histiocytic sarcoma
  • (M9756/3) Langerhans cell sarcoma
  • (M9757/3) Dendritic cell sarcoma, NOS or Interdigitating dendritic cell sarcoma/tumor
  • (M9758/3) Follicular dendritic cell sarcoma/tumor

• (9760-9769) Immunoproliferative diseases
  • (M9761/3) Waldenstrom macroglobulinemia
  • (M9766/1) Lymphomatoid granulomatosis

• (9800-9809) Leukemias, NOS
  • (M9800/3) Leukemia, NOS
  • (M9805/3) Acute leukemia of ambiguous lineage
  • (M9801/3) Acute leukemia, NOS

• (9820-9829) Lymphoid leukemias
  • (M9820/3) Lymphocytic leukemia, NOS
  • (M9820/3) Lymphatic leukemia, NOS
  • (M9821/3) Acute lymphoblastic leukemia, NOS
  • (M9821/3) Acute lymphocytic leukemia
  • (M9823/3) Chronic lymphocytic leukemia
  • (M9826/3) Leukemia
  • (M9827/3) Adult T-cell leukemia/lymphoma

• (9830-9839) Plasma cell leukemia
  • (M9831/3) T-cell large granular lymphocytic leukemia
  • (M9833/3) B-cell prolymphocytic leukemia
  • (M9834/3) T-cell prolymphocytic leukemia
  • (M9835/3) Precursor B lymphoblastic leukemia
  • (M9837/3) Precursor T lymphoblastic leukemia

• (9840-9849) Erythroleukemias (FAB-M6)
  • (M9840/3) Acute erythroid leukemia

• (9850-9859) Lymphosarcoma cell leukemia

• (9860-9869) Myeloid (Granulocytic) Leukemias
  • (M9860/3) Myeloid leukemia, NOS
  • (M9860/3) Myelogenous leukemia, NOS
  • (M9861/3) Acute myelogenous leukemia (FAB-M1,M2)
  • (M9863/3) Chronic myelogenous leukemia
  • (M9866/3) Acute promyelocytic leukemia (FAB-M3)
  • (M9866/3) Acute promyelocytic leukemia (AML with t(15;17)(q22;q12), PML-RARa and variants)
  • (M9867/3) Acute myelomonocytic leukemia (FAB-M4)

• (9870-9889) Basophilic leukemia and Eosinophilic leukemia
  • (M9870/3) Basophilic leukemia or Acute basophilic leukemia
  • (M9871/3) AML with inv(16)(p13q22) or t(16;16)(p13;q22), CBFb/MYH11 (FAB M4Eo)
  • (M9872/3) Acute myeloid leukemia, minimally differentiated (FAB type M0)
  • (M9873/3) Acute myeloid leukemia, without maturation (FAB type M1)
  • (M9874/3) Acute myeloid leukemia, with maturation (FAB M2)
  • (M9875/3) Chronic myelogenous leukemia
  • (M9876/3) Atypical chronic myelogenous leukemia
  • (M9880/3) Eosinophilic leukemia

• (9890-9899) Monocytic leukemias
  • (M9890/3) Monocytic leukemia, NOS (FAB-M5)
  • (M9891/3) Acute monoblastic and monocytic leukemia (FAB M5)
  • (M9895/3) Acute myeloid leukemia multilineage dysplasia
  • (M9896/3) AML with t(8;21)(q22;q22), AML1/ETO
  • (M9897/3) AML with 11q23 (MLL) abnormalities

• (9900-9948) Other Leukemias
  • (M9910/3) Acute megakaryoblastic leukemia (FAB-M7)
  • (M9920/3) Acute myeloid leukemia and myelodysplastic syndrome, therapy related
  • (M9930/3) Chloroma or Myeloid sarcoma
  • (M9931/3) Acute panmyelosis with myelofibrosis
  • (M9940/3) Hairy cell leukemia
  • (M9946/3) Juvenile myelomonocytic leukemia
  • (M9948/3) Aggressive NK cell leukemia

• (9950-9970) Miscellaneous Myeloproliferative And Lymphoproliferative disorders
  • (M9950/3) Polycythemia vera
  • (M9960/1) Myeloproliferative disease, NOS
  • (M9961/3) Chronic idiopathic myelofibrosis
  • (M9962/3) Essential thrombocytemia
  • (M9963/3) Chronic neutrophilic leukemia
  • (M9964/3) Chronic eosinophilic leukemia / hypereosinophilic syndrome
  • (M9970/1) Post-transplant lymphoproliferative disorder, pleomorphic
  • (M9975/3) Chronic Myeloproliferative disease, unclassifiable
  • (M9975/3) Myelodysplastic / myeloproliferative diseases, unclassifiable

• (9980-9989) Myelodysplastic syndrome
  • (M9980/3) Chronic myelomonocytic leukemia or Refractory anemia
  • (M9982/3) Refractory anemia with ringed sideroblasts
  • (M9983/3) Refractory anemia with excess blasts
  • (M9985/3) Refractory cytopenia with multilineage dysplasia
  • (M9986/3) Myelodysplastic syndrome associated with isolated del(5q) chromosome abnormality
  • (M9989/3) Myelodysplastic syndrome, NOS

The topography axis is for the topographical codes of the tumor's site. It is standardized with the C section of ICD-10

There were no changes in the topography axis between ICD-O-2 and ICD-O-3.

See List of ICD-10 codes#.28C00-C97.29 Malignant Neoplasms for examples.

• Medical classification

• Official page at World Health Organization
• Tutorial at National Cancer Institute
• Overview at DIMDI
• Overview of multiple primaries at healthyarkansas.com (PPT)
• History of versions at National Cancer Institute

• Cancer.gov - overview, includes link to Excel spreadsheet with codes at National Cancer Institute
• Overview at National Cancer Institute
• Word document - malignancies only at National Cancer Institute
• Overview at University hospital Gießen und Marburg
• Download table at DIMDI
• Codes at IARC

v • d • e Epithelial neoplasms (ICD-O 8010-8790)
Papilloma/carcinoma - 8010-8139	Small cell carcinoma - Squamous cell carcinoma - Basal cell carcinoma - Transitional cell carcinoma - Signet ring cell carcinoma
Adenoma/adenocarcinoma - 8140-8439	Linitis plastica - Insulinoma - Glucagonoma - Gastrinoma - VIPoma - Cholangiocarcinoma - Hepatocellular adenoma/Hepatocellular carcinoma - Adenoid cystic carcinoma - Prolactinoma - Oncocytoma - Hurthle cell - Renal cell carcinoma - Multiple endocrine neoplasia - Endometrioid tumor - Mucoepidermoid carcinoma
8440-8589	Cystadenoma/Pseudomyxoma peritonei - Paget's disease of the breast/Extramammary Paget's disease - Acinic cell carcinoma - Warthin's tumor/Thymoma
Gonadal neoplasms - 8590-8679	Sex cord-stromal tumour - Thecoma - Granulosa cell tumour - Arrhenoblastoma/Sertoli-Leydig cell tumour
8680-8719	Paraganglioma - Pheochromocytoma - Glomus tumor
Nevi and melanomas - 8720-8790	Melanocytic nevus - Nodular melanoma - Dysplastic nevus - Lentigo maligna melanoma - Superficial spreading melanoma - Blue nevus

v • d • e Soft tissue tumors and sarcomas (ICD-O 8800-9349)
8800-9059	Soft tissue sarcoma - Desmoplastic small round cell tumor - Fibroma/fibrosarcoma - Myxoma - Lipoma / liposarcoma (Angiomyolipoma) - Leiomyoma/leiomyosarcoma - Rhabdomyoma/rhabdomyosarcoma - Sarcoma botryoides - Pleomorphic adenoma - Wilms' tumor - Rhabdoid tumour - Brenner tumour - Fibroadenoma - Phyllodes tumor - Synovial sarcoma - Mesothelioma
Germ cell tumors: 9060-9119	Germinoma: Dysgerminoma - Seminoma nongerminomatous germ cell tumors: Embryonal carcinoma - Endodermal sinus tumor / Yolk sac tumor - Teratoma/Fetus in fetu / Dermoid cyst/Struma ovarii - Gestational trophoblastic disease (Hydatidiform mole) - Choriocarcinoma - Polyembryoma - Gonadoblastoma
Vascular: 9120-9179	Hemangioma/hemangiosarcoma - Angioma/angiosarcoma - Blue rubber bleb nevus syndrome - Hemangioendothelioma - Kaposi's sarcoma - Hemangiopericytoma - Lymphangioma/lymphangiosarcoma
Osseous and chondromatous: 9180-9349	Osteoma/osteosarcoma - Osteochondroma - Chondroma/enchondroma/chondrosarcoma - Giant cell tumor of bone - Ewing's sarcoma - Cementoblastoma - Adenomatoid odontogenic tumor - Ameloblastoma - Chordoma

v • d • e Nervous tissue tumors (ICD-O 9350-9589)
Miscellaneous tumors (9350-9370)	Craniopharyngioma - Pinealoma
Glioma (9380-9480)	Gliomatosis cerebri - Oligoastrocytoma - Ependymoma - Astrocytoma (Pilocytic astrocytoma, Glioblastoma multiforme) - Dysembryoplastic neuroepithelial tumour - Oligodendroglioma - Medulloblastoma - Primitive neuroectodermal tumor
Neuroepitheliomatous (9490-9520)	Ganglioneuroma - Neuroblastoma - Atypical teratoid rhabdoid tumor - Retinoblastoma
Meningiomas (9530)	Meningioma
Nerve sheath tumor (9540-9570)	Neurofibroma (Neurofibrosarcoma, Neurofibromatosis) - Schwannoma - Neurinoma - Acoustic neuroma - Neuroma
see also brain tumors (though not all brain tumors are of nervous tissue)

v • d • e Hematological malignancy histology (ICD-O 9590-9989)
Lymphomas (9590-9759)	Hodgkin's lymphoma vs. Non-Hodgkin lymphoma - Diffuse lymphoma vs. Follicular lymphoma B-cell lymphoma (Small cell, Primary effusion, Diffuse large, ,Burkitt's, Splenic marginal zone, MALT) T-cell lymphoma (Cutaneous , Mycosis fungoides/Sézary's disease, Angioimmunoblastic, Anaplastic large cell, Hepatosplenic) plasma cell (Plasmacytoma, Multiple myeloma) mast cell tumor (Mast-cell sarcoma, Malignant mastocytosis, Malignant histiocytosis, Langerhans cell histiocytosis)
Immunoproliferative disorders (9760-9799)	Waldenström macroglobulinemia - Lymphomatoid granulomatosis
Lymphoid leukemias (9800-9839)	ALL - CLL - T-cell leukemia (Adult, Large granular lymphocyte, Prolymphocytic, Acute lymphoblastic) - B-cell leukemia (Prolymphocytic)
Myeloid leukemias (9840-9939, 9963)	AML (M2, APL/M3, AMoL/M5, Erythroleukemia/M6) - CML (CMoL, CNL, Philadelphia chromosome) - Granulocytic sarcoma
Other leukemias (9940-9949)	Hairy cell leukemia - Aggressive NK-cell leukemia
Myeloproliferative disease (9950-9961)	Polycythemia vera - Essential thrombocytosis - Myelofibrosis
Other (9964-9989)	Hypereosinophilic syndrome - Post-transplant lymphoproliferative disorder - Myelodysplastic syndrome