ICD-10-CM Use Additional Code Notes · Chapter 9 · FY 2027 I00-I99

Use Additional Code Notes in Chapter 9: Diseases of the circulatory system ICD-10-CM

A Use Additional Code note means a second code should be added, after this one, to fully describe the condition. In Chapter 9 (I00-I99), notes printed in the chapter name other codes 145 times, and Use Additional Code Notes anywhere in the Tabular List name the chapter’s codes 48 times, covering 24 distinct codes, categories and ranges. Switch views to read the list either way.

✓ From the official FY 2027 ICD-10-CM Tabular ListDefinitions follow the Official Guidelines, Section I.A
145
References in Its Notes
48
References to Its Codes
24
Chapter Codes Named
I00-I99
Chapter 9
Chapter 9

Use Additional Code Notes by the code that carries the note

86 of 86 shown
  • I09.81 Rheumatic heart failure
    • code to identify type of heart failure (I50.-)
  • Block note Block I10-I1A Hypertensive diseases applies to 18 codes
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
  • I11.0 Hypertensive heart disease with heart failure
    • code to identify type of heart failure (I50.-)
  • I12.0 Hypertensive chronic kidney disease with stage 5 chronic kidney disease or end stage renal disease
    • code to identify the stage of chronic kidney disease (N18.5, N18.6)
  • I12.9 Hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
  • I13.0 Hypertensive heart and chronic kidney disease with heart failure and stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
    • code to identify type of heart failure (I50.-)
    • code to identify stage of chronic kidney disease (N18.1-N18.4, N18.9)
  • I13.10 Hypertensive heart and chronic kidney disease without heart failure, with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
  • I13.11 Hypertensive heart and chronic kidney disease without heart failure, with stage 5 chronic kidney disease, or end stage renal disease
    • code to identify the stage of chronic kidney disease (N18.5, N18.6)
  • I13.2 Hypertensive heart and chronic kidney disease with heart failure and with stage 5 chronic kidney disease, or end stage renal disease
    • code to identify type of heart failure (I50.-)
    • code to identify the stage of chronic kidney disease (N18.5, N18.6)
  • I20 Angina pectoris applies to 6 codes
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
  • I21 Acute myocardial infarction applies to 13 codes
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
  • I22 Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction applies to 5 codes
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
  • I25 Chronic ischemic heart disease applies to 56 codes
    • chronic total occlusion of coronary artery (I25.82)
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
  • I25.1 Atherosclerotic heart disease of native coronary artery applies to 6 codes
    • coronary atherosclerosis due to calcified coronary lesion (I25.84)
    • coronary atherosclerosis due to lipid rich plaque (I25.83)
  • I25.7 Atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris applies to 35 codes
    • coronary atherosclerosis due to calcified coronary lesion (I25.84)
    • coronary atherosclerosis due to lipid rich plaque (I25.83)
  • I25.81 Atherosclerosis of other coronary vessels without angina pectoris applies to 3 codes
    • coronary atherosclerosis due to calcified coronary lesion (I25.84)
    • coronary atherosclerosis due to lipid rich plaque (I25.83)
  • I27.82 Chronic pulmonary embolism
    • code, if applicable, for associated long-term (current) use of anticoagulants (Z79.01)
  • I30.1 Infective pericarditis
    • code (B95-B97) to identify infectious agent
  • I33.0 Acute and subacute infective endocarditis
    • code (B95-B97) to identify infectious agent
  • I40.0 Infective myocarditis
    • code (B95-B97) to identify infectious agent
  • I42.7 Cardiomyopathy due to drug and external agent
    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
  • I47.21 Torsades de pointes
    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
  • I49.82 Ventricular bigeminy
  • Block note Block I60-I69 Cerebrovascular diseases applies to 410 codes
    • alcohol abuse and dependence (F10.-)
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • hypertension (I10-I1A)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
  • I60 Nontraumatic subarachnoid hemorrhage applies to 18 codes
    • code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)
  • I61 Nontraumatic intracerebral hemorrhage applies to 9 codes
    • code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)
  • I62 Other and unspecified nontraumatic intracranial hemorrhage applies to 6 codes
    • code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)
  • I63 Cerebral infarction applies to 91 codes
    • code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
    • code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)
  • I69.06 Other paralytic syndrome following nontraumatic subarachnoid hemorrhage applies to 6 codes
  • I69.091 Dysphagia following nontraumatic subarachnoid hemorrhage
    • code to identify the type of dysphagia, if known (R13.11-R13.19)
  • I69.16 Other paralytic syndrome following nontraumatic intracerebral hemorrhage applies to 6 codes
  • I69.191 Dysphagia following nontraumatic intracerebral hemorrhage
    • code to identify the type of dysphagia, if known (R13.11-R13.19)
  • I69.26 Other paralytic syndrome following other nontraumatic intracranial hemorrhage applies to 6 codes
  • I69.291 Dysphagia following other nontraumatic intracranial hemorrhage
    • code to identify the type of dysphagia, if known (R13.11-R13.19)
  • I69.36 Other paralytic syndrome following cerebral infarction applies to 6 codes
  • I69.391 Dysphagia following cerebral infarction
    • code to identify the type of dysphagia, if known (R13.11-R13.19)
  • I69.86 Other paralytic syndrome following other cerebrovascular disease applies to 6 codes
  • I69.891 Dysphagia following other cerebrovascular disease
    • code to identify the type of dysphagia, if known (R13.11-R13.19)
  • I69.96 Other paralytic syndrome following unspecified cerebrovascular disease applies to 6 codes
  • I69.991 Dysphagia following unspecified cerebrovascular disease
    • code to identify the type of dysphagia, if known (R13.11-R13.19)
  • I70 Atherosclerosis applies to 246 codes
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
  • I70.2 Atherosclerosis of native arteries of the extremities applies to 40 codes
    • code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)
  • I70.23 Atherosclerosis of native arteries of right leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.24 Atherosclerosis of native arteries of left leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.25 Atherosclerosis of native arteries of other extremities with ulceration
    • code to identify the severity of the ulcer (L98.49-)
  • I70.26 Atherosclerosis of native arteries of extremities with gangrene applies to 5 codes
    • code to identify the severity of any ulcer (L97.-, L98.49-), if applicable
  • I70.3 Atherosclerosis of unspecified type of bypass graft(s) of the extremities applies to 40 codes
    • code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)
  • I70.33 Atherosclerosis of unspecified type of bypass graft(s) of the right leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.34 Atherosclerosis of unspecified type of bypass graft(s) of the left leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.35 Atherosclerosis of unspecified type of bypass graft(s) of other extremity with ulceration
    • code to identify severity of ulcer (L98.49-)
  • I70.36 Atherosclerosis of unspecified type of bypass graft(s) of the extremities with gangrene applies to 5 codes
    • code to identify the severity of any ulcer (L97.-, L98.49-), if applicable
  • I70.4 Atherosclerosis of autologous vein bypass graft(s) of the extremities applies to 40 codes
    • code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)
  • I70.43 Atherosclerosis of autologous vein bypass graft(s) of the right leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.44 Atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.45 Atherosclerosis of autologous vein bypass graft(s) of other extremity with ulceration
    • code to identify severity of ulcer (L98.49)
  • I70.46 Atherosclerosis of autologous vein bypass graft(s) of the extremities with gangrene applies to 5 codes
    • code to identify the severity of any ulcer (L97.-, L98.49-), if applicable
  • I70.5 Atherosclerosis of nonautologous biological bypass graft(s) of the extremities applies to 40 codes
    • code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)
  • I70.53 Atherosclerosis of nonautologous biological bypass graft(s) of the right leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.54 Atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.55 Atherosclerosis of nonautologous biological bypass graft(s) of other extremity with ulceration
    • code to identify severity of ulcer (L98.49)
  • I70.56 Atherosclerosis of nonautologous biological bypass graft(s) of the extremities with gangrene applies to 5 codes
    • code to identify the severity of any ulcer (L97.-, L98.49-), if applicable
  • I70.6 Atherosclerosis of nonbiological bypass graft(s) of the extremities applies to 40 codes
    • code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)
  • I70.63 Atherosclerosis of nonbiological bypass graft(s) of the right leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.64 Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.65 Atherosclerosis of nonbiological bypass graft(s) of other extremity with ulceration
    • code to identify severity of ulcer (L98.49)
  • I70.66 Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene applies to 5 codes
    • code to identify the severity of any ulcer (L97.-, L98.49-), if applicable
  • I70.7 Atherosclerosis of other type of bypass graft(s) of the extremities applies to 40 codes
    • code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)
  • I70.73 Atherosclerosis of other type of bypass graft(s) of the right leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.74 Atherosclerosis of other type of bypass graft(s) of the left leg with ulceration applies to 7 codes
    • code to identify severity of ulcer (L97.-)
  • I70.75 Atherosclerosis of other type of bypass graft(s) of other extremity with ulceration
    • code to identify severity of ulcer (L98.49)
  • I70.76 Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene applies to 5 codes
    • code to identify the severity of any ulcer (L97.-, L98.49-), if applicable
  • I75.81 Atheroembolism of kidney
    • code for any associated acute kidney failure and chronic kidney disease (N17.-, N18.-)
  • I76 Septic arterial embolism
    • code to identify the site of the embolism (I74.-)
  • I82.5 Chronic embolism and thrombosis of deep veins of lower extremity applies to 40 codes
    • code, if applicable, for associated long-term (current) use of anticoagulants (Z79.01)
  • I82.7 Chronic embolism and thrombosis of veins of upper extremity applies to 12 codes
    • code, if applicable, for associated long-term (current) use of anticoagulants (Z79.01)
  • I82.8 Embolism and thrombosis of other specified veins applies to 6 codes
    • code, if applicable, for associated long-term (current) use of anticoagulants (Z79.01)
  • I83.0 Varicose veins of lower extremities with ulcer applies to 21 codes
    • code to identify severity of ulcer (L97.-)
  • I83.2 Varicose veins of lower extremities with both ulcer and inflammation applies to 21 codes
    • code to identify severity of ulcer (L97.-)
  • I85 Esophageal varices applies to 4 codes
    • alcohol abuse and dependence (F10.-)
  • I87.01 Postthrombotic syndrome with ulcer applies to 4 codes
    • code to specify site and severity of ulcer (L97.-)
  • I87.03 Postthrombotic syndrome with ulcer and inflammation applies to 4 codes
    • code to specify site and severity of ulcer (L97.-)
  • I87.2 Venous insufficiency (chronic) (peripheral)
    • code, if applicable, to specify site and severity of ulcer (L97.-)
  • I87.31 Chronic venous hypertension (idiopathic) with ulcer applies to 4 codes
    • code to specify site and severity of ulcer (L97.-)
  • I87.33 Chronic venous hypertension (idiopathic) with ulcer and inflammation applies to 4 codes
    • code to specify site and severity of ulcer (L97.-)
  • I95.2 Hypotension due to drugs
    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
  • I97.13 Postprocedural heart failure applies to 2 codes
    • code to identify the heart failure (I50.-)

The first view lists notes printed in this chapter (a note on a category or block applies to every code beneath it). The second lists codes of this chapter named by Use Additional Code Notes anywhere in the Tabular List, including notes in other chapters.

Questions About Use Additional Code Notes

What does a Use Additional Code note mean?

A Use Additional Code note tells you to add a second code, reported after the code that carries the note, to describe the condition completely. In an etiology/manifestation pair it sits at the etiology code and points to the manifestation (Section I.A.13). The FY 2027 Tabular List has 1,491 of them; 1,174 name other codes, with 1,438 references to 389 distinct codes, categories and ranges.

Where does the additional code go?

After the code carrying the note. For etiology/manifestation pairs the Guidelines are explicit: the etiology is sequenced first, followed by the manifestation code.

Related References

ICD-10-CM Official GuidelinesICD-10-CM Code LookupICD-10-CM Codes ListCode Lists by Tag

Source: FY 2027 ICD-10-CM Tabular List (CMS and NCHS) and the ICD-10-CM Official Guidelines for Coding and Reporting FY 2027, Section I.A. ICD List is not affiliated with CMS or NCHS.