DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I99 Other and unspecified disorders of circulatory system

  • Header · not billable

I99 is not billable. The category heads 2 billable codes in FY2027: the 2 codes directly below it.

Index → code

  • Ischemia, ischemic → I99.8
  • Angiopathia, angiopathy → I99.9
  • Angiectasis, angiectopia → I99.8

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I95-I99 Other and unspecified disorders of the circulatory system (I95-I99)
  3. I99 Other and unspecified disorders of circulatory system
Billable codes
2
Subdivisions
2
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
33

Codes in I99

  1. I99.8
    Other disorder of circulatory system
    Billable
  2. I99.9
    Unspecified disorder of circulatory system
    Billable

Sources of each column.

Instructions

Notes that also apply

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Angiectasis, angiectopia → I99.8
  • Fluctuating blood pressure → I99.8
  • Ischemia, ischemic → I99.8
  • Angiopathia, angiopathy → I99.9
  • Atrophy, atrophic (of)vascular → I99.8
  • Circulationcollateral, any site → I99.8
  • Complication(s) (from) (of)circulatory system → I99.8
  • Congestion, congestivecirculatory NEC → I99.8
  • Dilatationblood vessel → I99.8
  • Disease, diseasedcirculatory (system) NEC → I99.8
  • Dissectionvascular → I99.8
  • Insufficiency, insufficientarteriovenous → I99.8
  • Insufficiency, insufficientcirculatory NEC → I99.8
  • Insufficiency, insufficientvascular → I99.8
  • Obstruction, obstructed, obstructivecirculatory → I99.8
  • Obstruction, obstructed, obstructivevessel NEC → I99.8
  • Occlusion, occludedvascular NEC → I99.8
  • Occlusion, occludedvessel (blood) → I99.8
  • Change(s) (in) (of)circulatory → I99.9
  • Change(s) (in) (of)vascular → I99.9
  • Circulationdefective (lower extremity) → I99.9
  • Complication(s) (from) (of)vascular → I99.9
  • Damagevascular → I99.9
  • Defect, defectivecirculation → I99.9
  • Defect, defectivevascular (local) → I99.9
  • Deficiency, deficientvascular → I99.9
  • Disease, diseasedvascular → I99.9
  • Disturbance(s)circulatory → I99.9
  • Disturbance(s)vascular → I99.9
  • Lesion(s) (nontraumatic)vascular → I99.9
  • Bloodpressurefluctuating → I99.8
  • Disease, diseasedvascularocclusive → I99.8
  • Disease, diseasedbloodvessel → I99.9

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy