I00-I99
Diseases of the circulatory system
Chapter coding notes
certain conditions originating in the perinatal period (P04-P96) certain infectious and parasitic diseases (A00-B99) complications of pregnancy, childbirth and the puerperium (O00-O9A) congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) endocrine, nutritional and metabolic diseases (E00-E88) injury, poisoning and certain other consequences of external causes (S00-T88) neoplasms (C00-D49) symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) systemic connective tissue disorders (M30-M36) transient cerebral ischemic attacks and related syndromes (G45.-)
Blocks in this chapter
I00-I02
Acute rheumatic fever
I05-I09
Chronic rheumatic heart diseases
I10-I1A
Hypertensive diseases
I20-I25
Ischemic heart diseases
I26-I28
Pulmonary heart disease and diseases of pulmonary circulation
I30-I5A
Other forms of heart disease
I60-I69
Cerebrovascular diseases
I70-I79
Diseases of arteries, arterioles and capillaries
I80-I89
Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
I95-I99
Other and unspecified disorders of the circulatory system
Official Guidelines for Chapter 9
FY 2026 ›Sections that reference codes in Chapter 9
- I.C.9.a.1)Hypertension with Heart DiseaseI50
- I.C.9.a.2)Hypertensive Chronic Kidney DiseaseI12
- I.C.9.a.3)Hypertensive Heart and Chronic Kidney DiseaseI13
- I.C.9.a.4)Hypertensive Cerebrovascular DiseaseI60-I69
- I.C.9.a.5)Hypertensive RetinopathyI10 – I15
- I.C.9.a.6)Hypertension, SecondaryI15
- I.C.9.a.8)Hypertension, ControlledI10-I15
- I.C.9.a.9)Hypertension, UncontrolledI10-I15
Showing 8 of 22 sections that reference this range. Browse all FY 2026 guidelines.