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

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

A Code Also note means two codes may be needed to fully describe a condition; it gives no sequencing direction. In Chapter 9 (I00-I99), notes printed in the chapter name other codes 82 times, and Code Also Notes anywhere in the Tabular List name the chapter’s codes 76 times, covering 46 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
82
References in Its Notes
76
References to Its Codes
46
Chapter Codes Named
I00-I99
Chapter 9
Chapter 9

Code Also Notes by the code that carries the note

27 of 27 shown
  • I16 Hypertensive crisis applies to 3 codes
    • any identified hypertensive disease (I10-I15, I1A)
  • I16.1 Hypertensive emergency
  • Block note Block I20-I25 Ischemic heart diseases applies to 94 codes
    • the presence of hypertension (I10-I1A)
  • I21.A9 Other myocardial infarction type
    • (acute) stent occlusion (T82.897-)
    • (acute) stent stenosis (T82.855-)
    • (acute) stent thrombosis (T82.867-)
    • cardiac arrest due to underlying cardiac condition (I46.2)
    • complication of percutaneous coronary intervention (PCI) (I97.89)
    • occlusion of coronary artery bypass graft (T82.218-)
  • I27.21 Secondary pulmonary arterial hypertension
    • adverse effect of appetite depressants (T50.5X5)
    • congenital heart disease (Q20-Q28)
    • human immunodeficiency virus [HIV] disease (B20)
    • polymyositis (M33.2-)
    • portal hypertension (K76.6)
    • rheumatoid arthritis (M05.-)
    • schistosomiasis (B65.-)
    • Sjögren syndrome (M35.0-)
    • systemic sclerosis (M34.-)
  • I27.22 Pulmonary hypertension due to left heart disease
    • multiple valve disease (I08.-)
    • rheumatic mitral valve diseases (I05.-)
    • rheumatic aortic valve diseases (I06.-)
  • I27.23 Pulmonary hypertension due to lung diseases and hypoxia
    • bronchiectasis (J47.-)
    • cystic fibrosis with pulmonary manifestations (E84.0)
    • interstitial lung disease (J84.-)
    • pleural effusion (J90)
    • sleep apnea (G47.3-)
  • I27.24 Chronic thromboembolic pulmonary hypertension
    • associated pulmonary embolism, if applicable (I26.-, I27.82)
  • I27.29 Other secondary pulmonary hypertension
  • I27.81 Cor pulmonale (chronic)
    • , if applicable, right heart failure (I50.81-)
  • I27.83 Eisenmenger's syndrome
    • atrial septal defect (Q21.1-)
    • Eisenmenger's defect (Q21.8)
    • patent ductus arteriosus (Q25.0)
    • ventricular septal defect (Q21.0)
  • I27.841 Fontan-associated lymphatic dysfunction
    • chylothorax (J94.0)
    • Fontan associated protein-losing enteropathy (K90.49)
    • plastic (obstructive) bronchitis (J44.89)
  • I34.0 Nonrheumatic mitral (valve) insufficiency
    • nonrheumatic mitral (valve) annulus calcification (I34.81)
  • I34.2 Nonrheumatic mitral (valve) stenosis
    • nonrheumatic mitral (valve) annulus calcification (I34.81)
  • I34.81 Nonrheumatic mitral (valve) annulus calcification
    • nonrheumatic mitral (valve) insufficiency (I34.0)
    • nonrheumatic mitral (valve) stenosis (I34.2)
  • I35 Nonrheumatic aortic valve disorders applies to 5 codes
    • , if applicable, bicuspid aortic valve (Q23.81)
  • I42.6 Alcoholic cardiomyopathy
    • presence of alcoholism (F10.-)
  • I47.21 Torsades de pointes
    • , if applicable, long QT syndrome (I45.81)
  • I50.2 Systolic (congestive) heart failure applies to 4 codes
    • end stage heart failure, if applicable (I50.84)
  • I50.3 Diastolic (congestive) heart failure applies to 4 codes
    • end stage heart failure, if applicable (I50.84)
  • I50.4 Combined systolic (congestive) and diastolic (congestive) heart failure applies to 4 codes
    • end stage heart failure, if applicable (I50.84)
  • I50.814 Right heart failure due to left heart failure
    • the type of left ventricular failure, if known (I50.2-I50.43)
  • I50.82 Biventricular heart failure
    • the type of left ventricular failure as systolic, diastolic, or combined, if known (I50.2-I50.43)
  • I50.84 End stage heart failure
    • the type of heart failure as systolic, diastolic, or combined, if known (I50.2-I50.43)
  • I67.4 Hypertensive encephalopathy
    • essential (primary) hypertension (I10)
    • hypertensive chronic kidney disease (I12.-)
    • hypertensive heart and chronic kidney disease (I13.-)
    • hypertensive heart disease (I11.-)
  • I67.850 Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
  • I87.2 Venous insufficiency (chronic) (peripheral)
    • essential (primary) hypertension (I10)
    • hypertensive chronic kidney disease (I12.-)
    • hypertensive heart and chronic kidney disease (I13.-)
    • hypertensive heart disease (I11.-)

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 Code Also Notes anywhere in the Tabular List, including notes in other chapters.

Questions About Code Also Notes

What does a Code Also note mean?

A Code Also note instructs that two codes may be required to fully describe a condition, but it does not give sequencing direction (Section I.A.17). The FY 2027 Tabular List has 689 of them; 495 name other codes, with 538 references to 349 distinct codes, categories and ranges.

Which code goes first with a Code Also note?

The note does not decide it. Sequencing depends on the circumstances of the encounter: normally the condition that is the main reason for the visit goes first.

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.