Is L03.91 a billable ICD-10-CM code?

Yes. L03.91 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does L03.91 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 L03.91?

L03.91 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter.

L03.91

L03.91 — Acute lymphangitis, unspecified

Billable / specific codeICD-10-CM

L03.91 is a billable, specific ICD-10-CM code for acute lymphangitis, unspecified. It is valid for submission on a claim.

Excludes1 — never code together

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

lymphangitis NOS (I89.1)

Excludes2 inherited from the categories above L03.91

Also inherited, and the opposite of Excludes1: these conditions are not part of L03.91, but a patient can have both, so you may code both.

Written on L03 — Cellulitis and acute lymphangitis

cellulitis of anal and rectal region (K61.-)
cellulitis of external auditory canal (H60.1)
cellulitis of eyelid (H00.0)
cellulitis of female external genital organs (N76.4)
cellulitis of lacrimal apparatus (H04.3)
cellulitis of male external genital organs (N48.2, N49.-)
cellulitis of mouth (K12.2)
cellulitis of nose (J34.0)
eosinophilic cellulitis [Wells] (L98.3)
febrile neutrophilic dermatosis [Sweet] (L98.2)
lymphangitis (chronic) (subacute) (I89.1)

Other codes that can never be billed with L03.91

These codes carry an Excludes1 note pointing at L03.91. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading L03.91 alone.

I89.1Lymphangitis

Risk adjustment

L03.91 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.

Medicare coverage

L03.91 is named in 2 Medicare coverage policies — 2 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52996Billing and Coding: Routine Foot Care
A57954Billing and Coding: Routine Foot Care

How L03.91 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to L03.91.

Lymphangitis›acute

Code history

L03.91 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share L03.9. If L03.91 is not quite right, the correct code is usually one of these.

L03.90Cellulitis, unspecified

Questions about L03.91

Is L03.91 a billable ICD-10-CM code?: Yes. L03.91 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does L03.91 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 L03.91?: L03.91 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter.