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Primary Diagnosis Categories
ICD-10 Chapter | Primary Diagnosis Categories | ICD-10-CM Codes |
|---|---|---|
1 | Certain infectious and parasitic diseases | A00-B99 |
2 | Neoplasms | C00-D49 |
3 | Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism | D50-D89 |
4 | Endocrine, nutritional, and metabolic diseases | E00-E90 |
5 | Mental and behavioral disorders | F00-F99 |
6 | Diseases of the nervous system | G00-G99 |
7 | Diseases of the eye and adnexa | H00-H59 |
8 | Diseases of the ear and mastoid process | H60-H95 |
9 | Diseases of the circulatory system | I00-I99 |
10 | Diseases of the respiratory system | J00-J99 |
11 | Diseases of the digestive system | K00-K95 |
12 | Diseases of the skin and subcutaneous tissue | L00-L99 |
13 | Diseases of the musculoskeletal system and connective tissue | M00-M99 |
14 | Diseases of the genitourinary system | N00-N99 |
15 | Pregnancy, childbirth, and puerperium | O00-O9A |
16 | Certain conditions originating in the perinatal period | P00-P99 |
17 | Congenital malformations, deformations, and chromosomal abnormalities | Q00-Q99 |
18 | Symptoms, signs, and abnormal clinical and laboratory findings, not elsewhere classified | R00-R99 |
19 | Injury, poisoning, and certain other consequences of external causes* | S00-T98 |
21 | Factors influencing health status and contact with health services | Z00-Z99 |
22 | Codes for special purposes | U00-U99 |
23 | Ungroupable | --- |
*The injury and poisoning codes given here and used in the Primary Diagnosis Categories of the Inpatient Hospital Discharge query are Nature of Injury, not External Cause of Injury (V01-Y98), codes. An example of nature of injury would be fracture of femur ("broken hip") or contusion of elbow (bruised elbow). The nature of injury is what happened to the person's body. The corresponding external cause of injury might be fall from a ladder or motor vehicle collision. The external cause of injury is how the injury happened.
For more information about ICD-10-CM codes: https://www.cdc.gov/nchs/icd/icd-10-cm.htm