I15 – Secondary hypertension

ICD-10-CM 2027 diagnosis code · Hypertensive diseases

Non-billable header

ICD-10-CM code I15

Code: I15 (claims format: I15)
Description: Secondary hypertension
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I10-I1A Hypertensive diseases

Billable codes under I15

I15 is a header code and cannot be used on claims. Choose the most specific code:

I15.0 – Renovascular hypertensionBillable
I15.1 – Hypertension secondary to other renal disordersBillable
I15.2 – Hypertension secondary to endocrine disordersBillable
I15.8 – Other secondary hypertensionBillable
I15.9 – Secondary hypertension, unspecifiedBillable

Notes for I15

Excludes1 (not coded here):

postprocedural hypertension (I97.3)

Excludes2 (not included here):

secondary hypertension involving vessels of brain (I60-I69)
secondary hypertension involving vessels of eye (H35.0-)

Code also:

underlying condition

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block I10-I1A

Excludes1 (not coded here):

neonatal hypertension (P29.2)
primary pulmonary hypertension (I27.0)

Excludes2 (not included here):

hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)

Use additional code:

code to identify:
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)

Frequently asked questions

What is ICD-10 code I15?

I15 is the ICD-10-CM code for secondary hypertension, in the block I10-I1A (Hypertensive diseases).

Is I15 a billable code?

No. I15 is a header code with more specific child codes; report one of the billable codes listed above.

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.