ICD-10-CM 2027
ICD-10 code for Pachyonychia
From the official ICD-10-CM alphabetic index entry “Pachyonychia (congenital)”. Page updated September 29, 2026.
About coding Pachyonychia
The ICD-10-CM code for Pachyonychia is Q84.5 (Enlarged and hypertrophic nails).
Within Q84 (other congenital malformations of integument), Q84.5 is specifically for enlarged and hypertrophic nails. Related codes cover congenital alopecia (Q84.0), congenital morphological disturbances of hair, not elsewhere classified (Q84.1), other congenital malformations of hair (Q84.2), Anonychia (Q84.3), congenital leukonychia (Q84.4), other congenital malformations of nails (Q84.6), other specified congenital malformations of integument (Q84.8) and congenital malformation of integument, unspecified (Q84.9).
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.
Common questions about Pachyonychia ICD-10 codes
What is the ICD-10 code for Pachyonychia?
- Q84.5 — Enlarged and hypertrophic nails.
Is Q84.5 billable?
- Yes. Q84.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q84.5 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q84.5 as a principal diagnosis.
Is Q84.5 a CC or MCC?
- No. Q84.5 is neither a CC nor an MCC under MS-DRG v44.0.