Is J18 a billable ICD-10-CM code?

No. J18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does J18 sit in the tabular list?

Diseases of the respiratory system (J00-J99), in the block Influenza and pneumonia (J09-J18).

What cannot be coded together with J18?

J18 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

J18

J18 — Pneumonia, unspecified organism

Non-billable headerICD-10-CM

J18 is a non-billable header ICD-10-CM code for pneumonia, unspecified organism. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

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

The underlying condition must be sequenced before this code.

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

Code also

Both codes may be needed to describe the encounter fully. Sequencing depends on the reason for the visit.

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

Other codes that can never be billed with J18

These codes carry an Excludes1 note pointing at J18. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading J18 alone.

J13Pneumonia due to Streptococcus pneumoniae
J16Pneumonia due to other infectious organisms, not elsewhere classified
J18.0Bronchopneumonia, unspecified organism
J81Pulmonary edema

Risk adjustment

J18 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead J18

5 child codes. Green means billable.

Questions about J18

Is J18 a billable ICD-10-CM code?: No. J18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does J18 sit in the tabular list?: Diseases of the respiratory system (J00-J99), in the block Influenza and pneumonia (J09-J18).
What cannot be coded together with J18?: J18 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.