ICD-10 L23.9
Billable / SpecificAllergic contact dermatitis, unspecified cause
About ICD-10-CM L23.9
ICD-10-CM code L23.9 represents Allergic contact dermatitis, unspecified cause. This is a billable/specific code in the Skin and Subcutaneous Tissue chapter (block L23). The 2026 edition of ICD-10-CM L23.9 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under L23.9. Per CMS ICD-10-CM Tabular 2026.
- Allergic contact eczema NOS
Medicare LCD Coverage for L23.9
Local Coverage Determinations (LCDs) from CMS MACs that list L23.9 as a covered diagnosis.
Showing top 10 of 61 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing L23.9.
1 Aetna
3 Medicare
CPT Codes Commonly Billed with L23.9
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 95004 Allergy skin prick testing — allergic rhinitis, pollen allergy, animal allergy, food allergy, asthma, atopic dermatitis, anaphylaxis, urticaria, allergic contact dermatitis, allergic gastroenteritis Allergy
Convert L23.9 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 |
|---|---|---|
| L23.9 | 6929 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To L23.9
Other codes in section L20-L30 (Dermatitis and eczema).
ICD-10 L23.9, Billing FAQ
Is ICD-10 code L23.9 billable? +
Yes, L23.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to L23.9? +
ICD-10 L23.9 includes: Allergic contact eczema NOS.
What CPT codes are commonly billed with L23.9? +
Procedures frequently paired with L23.9 include: 95004.
What ICD-9 codes does L23.9 map to? +
Per CMS GEMs, L23.9 maps to ICD-9 codes: 6929. Useful for legacy data review and historical claim analysis.
Get the full PayerReady toolkit
Free access to CPT/ICD-10 lookup, denial appeals, fee comparator, and claim auditing with credentialing enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team