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J18

Non-billable

Pneumonia, unspecified organism

J18 is the ICD-10-CM code for Pneumonia, unspecified organism. It is a non-billable category code — use a more specific child code such as J18.0 for billing.

Status
Header (non-billable)
Chapter
J00-J99
Subcodes
5
Edition
FY2026

J00-J99 Diseases of the respiratory system

What this means — in plain language

MedlinePlus · NIH

What is pneumonia? Pneumonia is an infection in one or both of your lungs. It causes the air sacs of your lungs to fill up with fluid or pus. Pneumonia can range from mild to severe, depending on what caused it, your age, and your overall health. What causes pneumonia? Bacterial , viral , and fungal infections can cause pneumonia. Bacteria are the most common cause. Bacterial pneumonia can occur on its own. It can…

Read more about Pneumonia at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Excludes1 — not coded here

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

Excludes2 — not included here

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

Code first

Notes

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

Medications indicated for this condition

FDA labeling

Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.

Frequently asked questions

What is ICD-10 code J18?
J18 is the ICD-10-CM code for "Pneumonia, unspecified organism". It falls under J00-J99 Diseases of the respiratory system.
Is J18 a billable code?
No — J18 is a non-billable header code. Use a more specific child code (such as J18.0) for billing.
What are the subcodes of J18?
J18 has 5 more specific child codes, including J18.0, J18.1, J18.2.
What is excluded from J18?
Excludes1 (not coded here): congenital pneumonia (P23.0); drug-induced interstitial lung disorder (J70.2-J70.4); interstitial pneumonia NOS (J84.9); neonatal aspiration pneumonia (P24.-).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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