I99.9
Unspecified disorder of circulatory system
BillableComplete code, valid to report
I99.9 (also written I999) is a billable ICD-10-CM diagnosis code for unspecified disorder of circulatory system. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 2 codes in category I99 (Other and unspecified disorders of circulatory system). The Alphabetic Index lists it under 14 entries. Its coding notes include 10 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
Inherited from Chapter 9 Diseases of the circulatory system
- 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.-)
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 14 entries
- Angiopathia, angiopathy
- Change (s) (in) (of), circulatory
- Change (s) (in) (of), vascular
- Circulation, defective (lower extremity)
- Complication (s) (from) (of), vascular
- Damage, vascular
- Defect, defective, circulation
- Defect, defective, vascular (local)
- Deficiency, deficient, vascular
- Disease, diseased, blood, vessel
- Disease, diseased, vascular
- Disturbance (s), circulatory