I10

Billable
ChapterI00–I99
Rankcategory
Official Description

Essential (primary) hypertension

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 9: Diseases of the Circulatory System (I00-I99).

CH9 Parent Instructions

Excludes2(Not included here)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

I10-I1A Parent Instructions

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)

Instructional Notes

Includes
  • high blood pressure
  • hypertension (arterial) (benign) (essential) (malignant) (primary) (systemic)
Excludes1(Not coded here)
  • hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)
Excludes2(Not included here)
  • essential (primary) hypertension involving vessels of brain (I60-I69)
  • essential (primary) hypertension involving vessels of eye (H35.0-)

Clinical Hierarchy

CH9Diseases of the circulatory system (I00-I99)
I10-I1AHypertensive diseases (I10-I1A)
I10Essential (primary) hypertension

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I10:

blockI10-I1A
Hypertensive diseases (I10-I1A)
View context instructions
chapterCH9
Diseases of the circulatory system (I00-I99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to I10. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

1 raw paths
Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)1 unique routes
Direct index entry→I10

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 304
Hypertension with MCC
DRG 305
Hypertension without MCC

Cross Reference

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