I27.21 – Secondary pulmonary arterial hypertension
ICD-10-CM 2027 diagnosis code · Pulmonary heart disease and diseases of pulmonary circulation
- Code
I27.21(claims format:I2721)- Description
- Secondary pulmonary arterial hypertension
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 9. Diseases of the circulatory system (I00-I99)
- Block
- I26-I28 Pulmonary heart disease and diseases of pulmonary circulation
- Parent codes
- I27 › I27.2
Notes for I27.21
- (Associated) (drug-induced) (toxin-induced) pulmonary arterial hypertension NOS
- (Associated) (drug-induced) (toxin-induced) (secondary) group 1 pulmonary hypertension
- 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.-)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
I27.2 – Other secondary pulmonary hypertension
- Eisenmenger's syndrome (I27.83)
- associated underlying condition
Index terms for I27.21
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in I27.2
- I27.20 – Pulmonary hypertension, unspecifiedBillable
- I27.22 – Pulmonary hypertension due to left heart diseaseBillable
- I27.23 – Pulmonary hypertension due to lung diseases and hypoxiaBillable
- I27.24 – Chronic thromboembolic pulmonary hypertensionBillable
- I27.29 – Other secondary pulmonary hypertensionBillable
Frequently asked questions
What is ICD-10 code I27.21?
I27.21 is the ICD-10-CM code for secondary pulmonary arterial hypertension, in the block I26-I28 (Pulmonary heart disease and diseases of pulmonary circulation).
Is I27.21 a billable code?
Yes. I27.21 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does I27.21 belong to?
It belongs to category I27 – Other pulmonary heart diseases.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.