Diagnosis

Diagnosis describe any diseases, illnesses or injuries a patient may have. It can be represented in a claim as ICD 10 code. ICD-10 codes are alphanumeric codes used by doctors, health insurance companies, and public health agencies across the world to represent diagnoses. Every disease, disorder, injury, infection, and symptom has its own ICD-10 code. ICD-10 codes are used for everything from processing health insurance claims to tracking disease epidemics and compiling worldwide mortality statistics.

ICD-10 codes are alphanumeric and contain 3-7 characters. Each code describes a particular diagnosis in detail.

The first 3 characters define the category of the disease, disorder, infection or symptom.

Characters in positions 4-6 define the body site, severity of the problem, cause of the injury or disease, and other clinical details.

Character 7 is an extension character used for varied purposes such as defining whether this is the initial encounter for this problem, a subsequent encounter, or sequela arising as a result of another condition.

ICD-10 chapters

The following table lists the chapter number (using Roman numerals), the code range of each chapter, and the chapter’s title from the international version of the ICD-10.

Chapter	Block	Title
I	A00–B99	Certain infectious and parasitic diseases
II	C00–D48	Neoplasms
III	D50–D89	Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
IV	E00–E90	Endocrine, nutritional and metabolic diseases
V	F00–F99	Mental and behavioural disorders
VI	G00–G99	Diseases of the nervous system
VII	H00–H59	Diseases of the eye and adnexa
VIII	H60–H95	Diseases of the ear and mastoid process
IX	I00–I99	Diseases of the circulatory system
X	J00–J99	Diseases of the respiratory system
XI	K00–K93	Diseases of the digestive system
XII	L00–L99	Diseases of the skin and subcutaneous tissue
XIII	M00–M99	Diseases of the musculoskeletal system and connective tissue
XIV	N00–N99	Diseases of the genitourinary system
XV	O00–O99	Pregnancy, childbirth and the puerperium
XVI	P00–P96	Certain conditions originating in the perinatal period
XVII	Q00–Q99	Congenital malformations, deformations and chromosomal abnormalities
XVIII	R00–R99	Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
XIX	S00–T98	Injury, poisoning and certain other consequences of external causes
XX	V01–Y98	External causes of morbidity and mortality
XXI	Z00–Z99	Factors influencing health status and contact with health services
XXII	U00–U99	Codes for special purposes

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