Is L04 a billable ICD-10-CM code?

No. L04 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does L04 sit in the tabular list?

Diseases of the skin and subcutaneous tissue (L00-L99), in the block Infections of the skin and subcutaneous tissue (L00-L08).

What cannot be coded together with L04?

L04 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

L04

L04 — Acute lymphadenitis

Non-billable headerICD-10-CM

L04 is a non-billable header ICD-10-CM code for acute lymphadenitis. 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.

chronic or subacute lymphadenitis, except mesenteric (I88.1)
enlarged lymph nodes (R59.-)
human immunodeficiency virus [HIV] disease resulting in generalized lymphadenopathy (B20)
lymphadenitis NOS (I88.9)
nonspecific mesenteric lymphadenitis (I88.0)

Includes

Conditions this code covers.

abscess (acute) of lymph nodes, except mesenteric
acute lymphadenitis, except mesenteric

Other codes that can never be billed with L04

These codes carry an Excludes1 note pointing at L04. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading L04 alone.

R59Enlarged lymph nodes
I88Nonspecific lymphadenitis

Risk adjustment

L04 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 L04

6 child codes. Green means billable.

Questions about L04

Is L04 a billable ICD-10-CM code?: No. L04 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does L04 sit in the tabular list?: Diseases of the skin and subcutaneous tissue (L00-L99), in the block Infections of the skin and subcutaneous tissue (L00-L08).
What cannot be coded together with L04?: L04 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.