ICD-10-CM 2027
ICD-10 code for Koilonychia
From the official ICD-10-CM alphabetic index entry “Koilonychia”. Page updated September 29, 2026.
About coding Koilonychia
The ICD-10-CM code for Koilonychia is L60.3 (Nail dystrophy). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on L60.3.
Within L60 (nail disorders), L60.3 is specifically for nail dystrophy. Related codes cover Ingrowing nail (L60.0), Onycholysis (L60.1), Onychogryphosis (L60.2), Beau's lines (L60.4), yellow nail syndrome (L60.5), other nail disorders (L60.8) and nail disorder, unspecified (L60.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Koilonychia codes (official index)
- congenital Q84.6 — Other congenital malformations of nails
Common questions about Koilonychia ICD-10 codes
What is the ICD-10 code for Koilonychia?
- L60.3 — Nail dystrophy. More specific codes apply when the documentation supports them: Q84.6.
What is the ICD-10 code for congenital koilonychia?
- Q84.6 — Other congenital malformations of nails.
Is L60.3 billable?
- Yes. L60.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L60.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L60.3 as a principal diagnosis.
Is L60.3 a CC or MCC?
- No. L60.3 is neither a CC nor an MCC under MS-DRG v44.0.