DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

I39 diagnosis code · Billable category · FY2027

I39 Endocarditis and heart valve disorders in diseases classified elsewhere

  • Billable
  • CC
  • POA reported

I39 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. I39 Endocarditis and heart valve disorders in diseases classified elsewhere
CC / MCC
CC
MS-DRG
306-307, 791, 793
HCC V28
–
POA
Reported
Code Editor
Manifestation
Index entries
3

Instructions

At I39

Excludes1

  • endocardial involvement in:
  • candidiasis (B37.6) B37.6
  • gonococcal infection (A54.83) A54.83
  • Libman-Sacks disease (M32.11) M32.11
  • listerosis (A32.82) A32.82
  • meningococcal infection (A39.51) A39.51
  • rheumatoid arthritis (M05.31) M05.31
  • syphilis (A52.03) A52.03
  • tuberculosis (A18.84) A18.84
  • typhoid fever (A01.02) A01.02

Code first

  • underlying disease, such as:
  • Q fever (A78) A78

Notes that also apply

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

Index entries

  • Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)Coxiella burnetii → A78 [I39]
  • Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)Q fever → A78 [I39]
  • Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)due toQ fever → A78 [I39]

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

Medicare grouping and edits

CMS files for I39
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 EditorManifestation code: not allowed as principal diagnosis
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