Is L99 a billable ICD-10-CM code?

Yes. L99 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does L99 sit in the tabular list?

Diseases of the skin and subcutaneous tissue (L00-L99), in the block Other disorders of the skin and subcutaneous tissue (L80-L99).

What cannot be coded together with L99?

L99 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

L99

L99 — Other disorders of skin and subcutaneous tissue in diseases classified elsewhere

Billable / specific codeICD-10-CM

L99 is a billable, specific ICD-10-CM code for other disorders of skin and subcutaneous tissue in diseases classified elsewhere. 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.

skin disorders in diabetes (E08-E13 with .62-)
skin disorders in gonorrhea (A54.89)
skin disorders in syphilis (A51.31, A52.79)

Code first

The underlying condition must be sequenced before this code.

underlying disease, such as:
amyloidosis (E85.-)

Risk adjustment

L99 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

L99 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56439Billing and Coding: Blepharoplasty
A56766Billing and Coding: Incision and Drainage (I&D) of Abscess of Skin, Subcutaneous and Accessory Structures
A57044Billing and Coding: Removal of Benign Skin Lesions
A57482Billing and Coding: Removal of Benign Skin Lesions

Questions about L99

Is L99 a billable ICD-10-CM code?: Yes. L99 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does L99 sit in the tabular list?: Diseases of the skin and subcutaneous tissue (L00-L99), in the block Other disorders of the skin and subcutaneous tissue (L80-L99).
What cannot be coded together with L99?: L99 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.