ICD-10 L99
Billable / SpecificOther disorders of skin and subcutaneous tissue in diseases classified elsewhere
About ICD-10-CM L99
ICD-10-CM code L99 represents Other disorders of skin and subcutaneous tissue in diseases classified elsewhere. This is a billable/specific code in the Skin and Subcutaneous Tissue chapter (block L99). The 2026 edition of ICD-10-CM L99 became effective on October 1, 2025.
Type 1 Excludes
Pure excludes, these codes can never be coded together with L99. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- skin disorders in diabetes (E08-E13 with .62-)
- skin disorders in gonorrhea (A54.89)
- skin disorders in syphilis (A51.31, A52.79)
Coding Notes
Code First
- underlying disease, such as:
- amyloidosis (E85.-)
Medicare LCD Coverage for L99
Local Coverage Determinations (LCDs) from CMS MACs that list L99 as a covered diagnosis.
Showing top 10 of 106 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing L99.
4 Medicare
CPT Codes Commonly Billed with L99
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert L99 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| L99 | 7018 | 10000 |
| L99 | 7098 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To L99
Other codes in section L80-L99 (Other disorders of the skin and subcutaneous tissue).
ICD-10 L99, Billing FAQ
Is ICD-10 code L99 billable? +
Yes, L99 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for L99? +
Type 1 Excludes (never code together with L99): skin disorders in diabetes (E08-E13 with .62-); skin disorders in gonorrhea (A54.89); skin disorders in syphilis (A51.31, A52.79)
What ICD-9 codes does L99 map to? +
Per CMS GEMs, L99 maps to ICD-9 codes: 7018, 7098. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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