Systematized Nomenclature of Medicine

The Systematized Nomenclature of Medicine (SNOMED) is a multiaxial, hierarchical classification system. As in any such system, a disease may be located in a body organ which results in a code in a topography axis and may lead to morphological alterations represented by a morphology code.

Axes
There are 11 axes. The axes and some examples are provided below:

T (Topography) -- Anatomic terms

 * (T-28000) Lung
 * (T-32000) Heart
 * (T-51000) Mouth
 * (T-D2500) Hip
 * (T-D9600) Heel

M (Morphology) -- Changes found in cells, tissues and organs

 * (M-40000) Inflammation
 * (M-44000) Granuloma
 * (M-54700) Infarcted
 * (M-54701) Microscopic infarct

''For the Morphology axis, SNOMED has agreed to use the same codes defined by International Classification of Diseases for Oncology. Additional examples on topology are provided on that page.''

L (Living organisms) -- Bacteria and viruses

 * (L-21801) Mycobacterium tuberculosis
 * (L-25116) Streptococcus pneumoniae

C (Chemical) -- Drugs

 * (C-C137A) Bufferin Analgesic Tablets
 * (C-C137B) Bufferin Analgesic Caplets

F (Function) -- Signs and symptoms

 * (F-03003) Fever

D (Diagnosis) -- Diagnostic terms

 * (D-13510) Pneumococcal pneumonia
 * (D-14800) Tuberculosis
 * (D3-15000) Myocardial infarction

S (Social context) -- Social conditions and important relationships in medicine

 * (S-10120) Mother