|  I27 |  | Other pulmonary heart diseases   | 
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		|  I27.0 |  | Primary pulmonary hypertension |  
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| Heritable pulmonary arterial hypertension |  | Idiopathic pulmonary arterial hypertension |  | Primary group 1 pulmonary hypertension |  | Primary pulmonary arterial hypertension |  
		| Excludes1 | persistent pulmonary hypertension of newborn (P29.30) pulmonary hypertension NOS (I27.20)
 secondary pulmonary arterial hypertension (I27.21)
 secondary pulmonary hypertension (I27.29)
 
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		|  I27.1 |  | Kyphoscoliotic heart disease |  | 
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		|  I27.2 |  | Other secondary pulmonary hypertension |  
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		| CodeAlso | associated underlying condition 
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		| Excludes1 | Eisenmenger's syndrome (I27.83) 
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		|  I27.20 |  | Pulmonary hypertension, unspecified |  
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| Pulmonary hypertension NOS |  |  |  |  |  | 
	
		|  I27.21 |  | Secondary pulmonary arterial hypertension |  
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| (Associated) (drug-induced) (toxin-induced) pulmonary arterial hypertension NOS |  | (Associated) (drug-induced) (toxin-induced) (secondary) group 1 pulmonary hypertension |  
		| CodeAlso | associated conditions if applicable, or adverse effects of drugs or toxins, such as: 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.-)
 
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		|  I27.22 |  | Pulmonary hypertension due to left heart disease |  
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| Group 2 pulmonary hypertension |  
		| CodeAlso | associated left heart disease, if known, such as: multiple valve disease (I08.-)
 rheumatic mitral valve diseases (I05.-)
 rheumatic aortic valve diseases (I06.-)
 
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		|  I27.23 |  | Pulmonary hypertension due to lung diseases and hypoxia |  
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| Group 3 pulmonary hypertension |  
		| CodeAlso | associated lung disease, if known, such as: bronchiectasis (J47.-)
 cystic fibrosis with pulmonary manifestations (E84.0)
 interstitial lung disease (J84.-)
 pleural effusion (J90)
 sleep apnea (G47.3-)
 
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		|  I27.24 |  | Chronic thromboembolic pulmonary hypertension |  
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| Group 4 pulmonary hypertension |  
		| CodeAlso | associated pulmonary embolism, if applicable (I26.-, I27.82) 
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		|  I27.29 |  | Other secondary pulmonary hypertension |  
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| Group 5 pulmonary hypertension |  | Pulmonary hypertension with unclear multifactorial mechanisms |  | Pulmonary hypertension due to hematologic disorders |  | Pulmonary hypertension due to metabolic disorders |  | Pulmonary hypertension due to other systemic disorders |  
		| CodeAlso | other associated disorders, if known, such as: chronic myeloid leukemia (C92.10-C92.22)
 essential thrombocythemia (D47.3)
 Gaucher disease (E75.22)
 hypertensive chronic kidney disease with end stage renal disease (I12.0, I13.11, I13.2)
 hyperthyroidism (E05.-)
 hypothyroidism (E00-E03)
 polycythemia vera (D45)
 sarcoidosis (D86.-)
 
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		|  I27.8 |  | Other specified pulmonary heart diseases |  |  |  | 
	
		|  I27.81 |  | Cor pulmonale (chronic) |  
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| Cor pulmonale NOS |  
		| CodeAlso | , if applicable, right heart failure (I50.81-) 
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		| Excludes1 | acute cor pulmonale (I26.0-) 
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		|  I27.82 |  | Chronic pulmonary embolism |  
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		| UseAdditionalCode | code, if applicable, for associated long-term (current) use of anticoagulants (Z79.01) 
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		| Excludes1 | personal history of pulmonary embolism (Z86.711) 
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		|  I27.83 |  | Eisenmenger's syndrome |  
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| Eisenmenger's complex |  | (Irreversible) Eisenmenger's disease |  | Pulmonary hypertension with right to left shunt related to congenital heart disease |  
		| CodeAlso | underlying heart defect, if known, such as: atrial septal defect (Q21.1-)
 Eisenmenger's defect (Q21.8)
 patent ductus arteriosus (Q25.0)
 ventricular septal defect (Q21.0)
 
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		|  I27.84 |  | Fontan related circulation |  |  |  | 
	
		|  I27.840 |  | Fontan-associated liver disease [FALD] |  |  |  |  | 
	
		|  I27.841 |  | Fontan-associated lymphatic dysfunction |  
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		| CodeAlso | associated conditions such as: chylothorax (J94.0)
 Fontan associated protein-losing enteropathy (K90.89)
 plastic (obstructive) bronchitis (J44.89)
 
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		|  I27.848 |  | Other Fontan-associated condition |  
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		| UseAdditionalCode | code to specify the Fontan associated condition 
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		|  I27.849 |  | Fontan related circulation, unspecified |  |  |  |  |  | 
	
		|  I27.89 |  | Other specified pulmonary heart diseases |  |  | 
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		|  I27.9 |  | Pulmonary heart disease, unspecified |  
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| Chronic cardiopulmonary disease |  |  |