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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 (ICD-O-3). ICD-10 includes a list of morphology codes. They stem from ICD-O second edition (ICD-O-2) that was valid at the time of publication.
The classification has two axes: topography and morphology
The morphology axis is for the morphology of the tumor.
This axis has particular importance because the Systematized Nomenclature of Medicine ("SNOMED") has adopted the ICD-O classification of morphology. SNOMED has been changing continuously, and several different versions of SNOMED are in use. Accordingly, mapping of ICD-O codes to SNOMED requires careful assessment of whether entities are indeed true matches.
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#(C00–C97) Malignant Neoplasms for examples.
Template:Medical classification
Template:Gonadal tumors, paraganglioma, glomus, nevi and melanomas
Blue nevus (of Jadassohn–Tièche · Cellular · Epithelioid · Deep penetrating · Amelanotic · Malignant )
Congenital melanocytic nevus (Giant · Medium-sized · Small-sized)
Balloon cell nevus · Dysplastic nevus/Dysplastic nevus syndrome
M: INT, SF, LCT
anat/phys/devp
noco (i/b/d/q/u/r/p/m/k/v/f)/cong/tumr (n/e/d), sysi/epon
proc, drug (D2/3/4/5/8/11)
M: MUS, DF+DRCT
anat (h/n, u, t/d, a/p, l)/phys/devp/hist
noco (m, s, c)/cong (d)/tumr, sysi/epon, injr
proc, drug (M1A/3)
M: VAS
anat (a:h/u/t/a/l,v:h/u/t/a/l)/phys/devp/cell/prot
noco/syva/cong/lyvd/tumr, sysi/epon, injr
proc, drug (C2s+n/3/4/5/7/8/9)
M: BON/CAR
anat (c/f/k/f, u, t/p, l)/phys/devp/cell
noco/cong/tumr, sysi/epon, injr
proc, drug (M5)
M: TTH
anat/devp/phys
noco/cong/jaws/tumr, epon, injr
dent, proc (endo, orth, pros)
M: CNS
anat (n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp
noco (m/d/e/h/v/s)/cong/tumr, sysi/epon, injr
proc, drug (N1A/2AB/C/3/4/7A/B/C/D)
M: PNS
anat (h/r/t/c/b/l/s/a)/phys (r)/devp/prot/nttr/nttm/ntrp
noco/auto/cong/tumr, sysi/epon, injr
proc, drug (N1B)
aggressive: Sézary's disease
CD30+: CD30+ cutaneous T-cell lymphoma
M: MYL
cell/phys (coag, heme, immu, gran), csfs
rbmg/mogr/tumr/hist, sysi/epon, btst
drug (B1/2/3+5+6), btst, trns
Acute myeloid leukemia, Icd-o, Anemia, Leukemia, Myeloproliferative disease
Chemotherapy, Leiomyosarcoma, International Classification of Diseases for Oncology, Cancer, Epithelium
Choriocarcinoma, Teratoma, Seminoma, Icd-o, Embryonal carcinoma