DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

J18 Pneumonia, unspecified organism

  • Header · not billable

J18 is not billable. The category heads 5 billable codes in FY2027: the 5 codes directly below it.

ICD-10 code by name

What is the ICD-10 code for pneumonia?
Pneumonia ICD-10 code: J18.9 Pneumonia, unspecified organism. Alphabetic Index: Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) → J18.9. Search ICD-10 for pneumonia

Where it sits

  1. Chapter 10 Diseases of the respiratory system (J00-J99)
  2. J09-J18 Influenza and pneumonia (J09-J18)
  3. J18 Pneumonia, unspecified organism
Billable codes
5
Subdivisions
5
CC / MCC codes
1 / 4
HCC V28 codes
0
New FY2027
0
Index entries
16

Codes in J18

  1. J18.0
    Bronchopneumonia, unspecified organism
    BillableMCC
    Excludes1 2, Excludes2 3

    Excludes1

    • hypostatic bronchopneumonia (J18.2) J18.2
    • lipid pneumonia (J69.1) J69.1

    Excludes2

    • acute bronchiolitis (J21.-) J21
    • chronic bronchiolitis (J44.89) J44.89
    • other specified chronic obstructive pulmonary disease (J44.89) J44.89
  2. J18.1
    Lobar pneumonia, unspecified organism
    BillableMCC
  3. J18.2
    Hypostatic pneumonia, unspecified organism
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Hypostatic bronchopneumonia
    • Passive pneumonia
  4. J18.8
    Other pneumonia, unspecified organism
    BillableMCC
  5. J18.9
    Pneumonia, unspecified organism 1 billable code
    BillableMCC

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At J18

Excludes1

  • congenital pneumonia (P23.0) P23.0
  • drug-induced interstitial lung disorder (J70.2-J70.4) J70.2 J70.4
  • interstitial pneumonia NOS (J84.9) J84.9
  • neonatal aspiration pneumonia (P24.-) P24
  • pneumonitis due to fumes and vapors (J68.0) J68.0
  • usual interstitial pneumonia (J84.178) J84.178

Excludes2

  • abscess of lung with pneumonia (J85.1) J85.1
  • aspiration pneumonia due to anesthesia during labor and delivery (O74.0) O74.0
  • aspiration pneumonia due to anesthesia during pregnancy (O29) O29
  • aspiration pneumonia due to anesthesia during puerperium (O89.0) O89.0
  • aspiration pneumonia due to solids and liquids (J69.-) J69
  • aspiration pneumonia NOS (J69.0) J69.0
  • lipid pneumonia (J69.1) J69.1
  • pneumonitis due to external agents (J67-J70) J67 J70

Code first

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

Code also

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

Notes that also apply

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

  • Bronchoalveolitis → J18.0
  • Pleuropneumonia (acute) (bilateral) (double) (septic) → J18.8
  • Pneumopleurisy, pneumopleuritis → J18.8
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal) → J18.0
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)lobar (disseminated) (double) (interstitial) → J18.1
  • Anasarcalung → J18.2
  • Anasarcapulmonary → J18.2
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)adynamic → J18.2
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)hypostatic (broncho) (lobar) → J18.2
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)orthostatic → J18.2
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)passive → J18.2
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)static, stasis → J18.2
  • Stasispneumonia → J18.2
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)specified NEC → J18.8
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal)hypostatic → J18.2
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)lobar (disseminated) (double) (interstitial)hypostatic → J18.2

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

Hierarchy