Is L03.021 a billable ICD-10-CM code?

Yes. L03.021 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does L03.021 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).

L03.021

L03.021 — Acute lymphangitis of right finger

Billable / specific codeICD-10-CMright

L03.021 is a billable, specific ICD-10-CM code for acute lymphangitis of right finger. It is valid for submission on a claim.

Excludes2 inherited from the categories above L03.021

Also inherited, and the opposite of Excludes1: these conditions are not part of L03.021, 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 L03.021

These codes carry an Excludes1 note pointing at L03.021. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading L03.021 alone.

I89.1Lymphangitis

Risk adjustment

L03.021 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

L03.021 is named in 5 Medicare coverage policies — 5 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A53058Billing and Coding: Home Health Physical Therapy
A53064Billing and Coding: Outpatient Occupational Therapy
A55909Billing and Coding: Wound Care
A56766Billing and Coding: Incision and Drainage (I&D) of Abscess of Skin, Subcutaneous and Accessory Structures

Code history

L03.021 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 L03.02. If L03.021 is not quite right, the correct code is usually one of these.

Questions about L03.021

Is L03.021 a billable ICD-10-CM code?: Yes. L03.021 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does L03.021 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).