DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

J15.9 diagnosis code · Billable code · FY2027

J15.9 Unspecified bacterial pneumonia

  • Billable
  • MCC
  • POA reported

J15.9 ICD-10 code: a billable diagnosis code in FY2027, one of 14 billable codes in category J15.

ICD-10 code by name

What is the ICD-10 code for bacterial pneumonia?
Bacterial pneumonia ICD-10 code: J15.9 Unspecified bacterial pneumonia. Alphabetic Index: Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)bacterial → J15.9. Search ICD-10 for bacterial pneumonia

Where it sits

  1. Chapter 10 Diseases of the respiratory system (J00-J99)
  2. J09-J18 Influenza and pneumonia (J09-J18)
  3. J15 Bacterial pneumonia, not elsewhere classified
  4. J15.9 Unspecified bacterial pneumonia
CC / MCC
MCC
MS-DRG
193-195, 791, 793, 974-976
HCC V28
–
POA
Reported
Code Editor
–
Index entries
5

Instructions

At J15.9

Inclusion terms

  • Pneumonia due to gram-positive bacteria

Notes that also apply

Includes from J15

  • bronchopneumonia due to bacteria other than S. pneumoniae and H. influenzae

Excludes1 from J15

  • chlamydial pneumonia (J16.0) J16.0
  • congenital pneumonia (P23.-) P23
  • Legionnaires' disease (A48.1) A48.1
  • spirochetal pneumonia (A69.8) A69.8

Code first from J15

  • , if applicable, associated influenza (J09.X1, J10.0-, J11.0-) J09.X1 J10.0 J11.0

Code also from J15

  • , if applicable, any associated condition such as:
  • abscess (J85.1) J85.1
  • aspiration pneumonia (J69.-) J69

Block J09-J18 instructions (Excludes2 9, Use additional code 1): printed on the block page.

Chapter 10 instructions (Notes 1, Excludes2 9, Use additional code 7): printed on the chapter 10 page.

Index entries

  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)bacillus → J15.9
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)bacterial → J15.9
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal)bacterial → J15.9
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)lobar (disseminated) (double) (interstitial)bacterial → J15.9
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)aspirationdue toaspiration of microorganismsbacterial → J15.9

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

Medicare grouping and edits

CMS files for J15.9
CC / MCCMCC
PDX exclusion list0113 (129 codes)
Appendix BMDC 04 Diseases and Disorders of the Respiratory System, MS-DRG 193-195 (Simple Pneumonia and Pleurisy 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…); MDC 25 Human Immunodeficiency Virus Infections, MS-DRG 974-976 (HIV with Major Related Condition with MCC…)
Code Editor–
POAReported
HCC V28–

MCC 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