Is L23.1 a billable ICD-10-CM code?

Yes. L23.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does L23.1 sit in the tabular list?

Diseases of the skin and subcutaneous tissue (L00-L99), in the block Dermatitis and eczema (L20-L30).

What cannot be coded together with L23.1?

L23.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above L23.1 (L23) and apply to it just the same.

L23.1

L23.1 — Allergic contact dermatitis due to adhesives

Billable / specific codeICD-10-CM

L23.1 is a billable, specific ICD-10-CM code for allergic contact dermatitis due to adhesives. It is valid for submission on a claim.

Excludes1 inherited from the categories above L23.1

These are not written on L23.1, but they bind it: a note on a category applies to every code beneath it. Billing L23.1 with anything listed here is a denial.

Written on L23 — Allergic contact dermatitis

allergy NOS (T78.40)
contact dermatitis NOS (L25.9)
dermatitis NOS (L30.9)

Excludes2 inherited from the categories above L23.1

Also inherited, and the opposite of Excludes1: these conditions are not part of L23.1, but a patient can have both, so you may code both.

Written on L23 — Allergic contact dermatitis

dermatitis due to substances taken internally (L27.-)
dermatitis of eyelid (H01.1-)
diaper dermatitis (L22)
eczema of external ear (H60.5-)
irritant contact dermatitis (L24.-)
perioral dermatitis (L71.0)
radiation-related disorders of the skin and subcutaneous tissue (L55-L59)

Other codes that can never be billed with L23.1

These codes carry an Excludes1 note pointing at L23.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading L23.1 alone.

L25Unspecified contact dermatitis
L50Urticaria

Risk adjustment

L23.1 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

L23.1 is named in 16 Medicare coverage policies — 16 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56459Billing and Coding: Debridement Services
A56558Billing and Coding: Allergy Testing
A56767Billing and Coding: Heavy Metal Testing
A57181Billing and Coding: Allergy Testing

How L23.1 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 L23.1.

Dermatitis›due to›adhesive(s) (allergic) (contact) (plaster)
Dermatitis›due to›plasters(adhesive) (any) (allergic) (contact)
Dermatitis›contact›allergic›due to›adhesives

Code history

L23.1 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 L23. If L23.1 is not quite right, the correct code is usually one of these.

Questions about L23.1

Is L23.1 a billable ICD-10-CM code?: Yes. L23.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does L23.1 sit in the tabular list?: Diseases of the skin and subcutaneous tissue (L00-L99), in the block Dermatitis and eczema (L20-L30).
What cannot be coded together with L23.1?: L23.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above L23.1 (L23) and apply to it just the same.