DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

I38 diagnosis code · Billable category · FY2027

I38 Endocarditis, valve unspecified

  • Billable
  • CC
  • POA reported

I38 ICD-10 code: a billable diagnosis code in FY2027; the category has no subdivisions.

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I30-I5A Other forms of heart disease (I30-I5A)
  3. I38 Endocarditis, valve unspecified
CC / MCC
CC
MS-DRG
306-307, 791, 793
HCC V28
–
POA
Reported
Code Editor
–
Index entries
8

Instructions

At I38

Includes

  • endocarditis (chronic) NOS
  • valvular incompetence NOS
  • valvular insufficiency NOS
  • valvular regurgitation NOS
  • valvular stenosis NOS
  • valvulitis (chronic) NOS

Excludes1

  • congenital insufficiency of cardiac valve NOS (Q24.8) Q24.8
  • congenital stenosis of cardiac valve NOS (Q24.8) Q24.8
  • endocardial fibroelastosis (I42.4) I42.4
  • endocarditis specified as rheumatic (I09.1) I09.1

Notes that also apply

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) → I38
  • Disease, diseasedvalve, valvular → I38
  • Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)arteriosclerotic → I38
  • Insufficiency, insufficientvalve, valvular (heart) → I38
  • Stenosis, stenotic (cicatricial)heart valve → I38
  • Stenosis, stenotic (cicatricial)valve (cardiac) (heart) → I38
  • Hypertrophy, hypertrophicheart (idiopathic)valve → I38
  • Strictureheartvalve → I38

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for I38
CC / MCCCC
PDX exclusion list0817 (8 codes)
Appendix BMDC 05 Diseases and Disorders of the Circulatory System, MS-DRG 306-307 (Cardiac Congenital and Valvular Disorders with MCC…); MDC 15 Newborns and Other Neonates with Conditions Originating in Perinatal Period, MS-DRG 791 (Prematurity with Major Problems…); MDC 15 Newborns and Other Neonates with Conditions Originating in Perinatal Period, MS-DRG 793 (Full Term Neonate with Major Problems…)
Code Editor–
POAReported
HCC V28–

CC as a secondary diagnosis, not when the principal diagnosis is on its PDX exclusion list.

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.

Hierarchy