L25.9 — Unspecified contact dermatitis, unspecified cause
L25.9 is a billable, specific ICD-10-CM code for unspecified contact dermatitis, unspecified cause. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Contact dermatitis (occupational) NOS
- Contact eczema (occupational) NOS
Excludes1 inherited from the categories above L25.9
These are not written on L25.9, but they bind it: a note on a category applies to every code beneath it. Billing L25.9 with anything listed here is a denial.
Excludes2 inherited from the categories above L25.9
Also inherited, and the opposite of Excludes1: these conditions are not part of L25.9, but a patient can have both, so you may code both.
Other codes that can never be billed with L25.9
These codes carry an Excludes1 note pointing at L25.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading L25.9 alone.
Risk adjustment
L25.9 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
L25.9 is named in 9 Medicare coverage policies — 9 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56558Billing and Coding: Allergy Testing
- A57181Billing and Coding: Allergy Testing
- A57473Billing and Coding: Allergy Testing
- A57473Billing and Coding: Allergy Testing
How L25.9 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 L25.9.
- Dermatitis›contact(occupational)
Code history
L25.9 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 L25. If L25.9 is not quite right, the correct code is usually one of these.
- L25.0Unspecified contact dermatitis due to cosmetics
- L25.1Unspecified contact dermatitis due to drugs in contact with skin
- L25.2Unspecified contact dermatitis due to dyes
- L25.3Unspecified contact dermatitis due to other chemical products
- L25.4Unspecified contact dermatitis due to food in contact with skin
- L25.5Unspecified contact dermatitis due to plants, except food
- L25.8Unspecified contact dermatitis due to other agents
Questions about L25.9
- Is L25.9 a billable ICD-10-CM code?
- Yes. L25.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does L25.9 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 L25.9?
- L25.9 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 L25.9 (L25) and apply to it just the same.