Is ICD-10-CM code I15 billable?

No, I15 (Secondary hypertension) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code I15 belong to?

I15 belongs to Chapter 9 of the ICD-10-CM tabular list: I00–I99 (Diseases of the Circulatory System).

I15Not billable, use a more specific code below

Secondary hypertension

In Hypertensive diseases (I10-I1A), chapter 9: Diseases of the Circulatory System

5 billable codes under I15: none are a CC or MCC; none map to an HCC.

Instructional notes

Excludes1: not coded here, use a different code

postprocedural hypertension (I97.3)

Excludes2: not included here, code separately if applicable

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

Code also: add a code for this too, order depends on the encounter

underlying condition

Also applies, from Hypertensive diseases (I10-I1A)

These notes sit on I10-I1A and apply to every code under it, including I15.

Excludes1: not coded here, use a different code

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

Excludes2: not included here, code separately if applicable

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

Use additional code: add a second code for this, listed after this one

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)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Section I.C.9.a Hypertension (page 50), covers I15
Presume hypertension is linked to heart disease and CKD unless documented as unrelated: use I11, I12, or I13 with additional I50 or N18 codes as directed. Other conditions need provider-documented linkage to be coded as related.

All codes under I15

I15 can't be used on a claim. Pick a billable code below; grey headings group them.

I15 MS-DRGs

As the principal diagnosis, all 5 billable codes under I15 group to MS-DRG 304 or 305 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to I15

Notes on these codes point to I15.

I12 Excludes1: secondary hypertension (I15.-)
I16 Code Also: any identified hypertensive disease (I10-I15, I1A)
I1A.0 Code First: secondary hypertension (I15.-)
O10.4 Use Additional Code: code from I15 to identify the type of secondary hypertension
O10.4 Includes: Any condition in I15 specified as a reason for obstetric care during pregnancy, childbirth or the puerperium

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

High Blood Pressure

Blood pressure is the force of your blood pushing against the walls of your arteries. Each time your heart beats, it pumps blood into the arteries. Your blood pressure is highest when your heart beats, pumping the blood. This is called systolic pressure. When your heart is at rest, between beats, your blood pressure falls. This is called diastolic pressure.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.