ICD-10-CM 2027
ICD-10 code for lesser circulation hypertension
From the official ICD-10-CM alphabetic index entry “Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic) › lesser circulation”. Page updated September 29, 2026.
About coding lesser circulation hypertension
The ICD-10-CM code for lesser circulation hypertension is I27.0 (Primary pulmonary hypertension).
Within I27 (other pulmonary heart diseases), I27.0 is specifically for primary pulmonary hypertension. Related codes cover Kyphoscoliotic heart disease (I27.1), other secondary pulmonary hypertension (I27.2), other specified pulmonary heart diseases (I27.8) and pulmonary heart disease, unspecified (I27.9).
Don't report I27.0 together with the conditions in its Excludes1 note: persistent pulmonary hypertension of newborn (P29.30), pulmonary hypertension NOS (I27.20), secondary pulmonary arterial hypertension (I27.21) and secondary pulmonary hypertension (I27.29).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Don't confuse with (Excludes1 for I27.0)
Common questions about lesser circulation hypertension ICD-10 codes
What is the ICD-10 code for lesser circulation hypertension?
- I27.0 — Primary pulmonary hypertension.
Is I27.0 billable?
- Yes. I27.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I27.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I27.0 as a principal diagnosis.
Is I27.0 a CC or MCC?
- I27.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.