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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