ICD-10-CM 2027 diagnosis code
Q84.6Other congenital malformations of nails
Q84.6 is a valid, billable ICD-10-CM code for other congenital malformations of nails. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Eponychia, ICD-10 code for Polyunguia, ICD-10 code for Platyonychia.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About Q84.6
Q84.6 is the ICD-10-CM diagnosis code for other congenital malformations of nails. It belongs to category Q84 (other congenital malformations of integument), block Q80-Q89 (other congenital malformations) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within Q84, choose Q84.6 (Other congenital malformations of nails) only when documentation doesn't support a more specific option: 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), enlarged and hypertrophic nails (Q84.5), 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.
It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 757.5 (specified anomalies of nails).
Coding notes
- Congenital clubnail
- Congenital koilonychia
- Congenital malformation of nail NOS
Notes that apply from higher levels
Instructions written at a parent level also apply to Q84.6.
Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.
Alphabetic index entries
26 entriesTerms in the official ICD-10-CM index that lead to Q84.6.
- Anomaly, anomalous (congenital) (unspecified type) › nail
- Atrophia › unguium › congenita
- Brittle › nails › congenital
- Clubnail › congenital
- Deformity › nail (acquired) › congenital
- Displacement, displaced › nail (congenital)
- Dystrophy, dystrophia › nail › congenital
- Dystrophy, dystrophia › unguium › congenital
- Egg shell nails › congenital
- Eponychia
- Fragilitas › unguium › congenital
- Furrowed › nail (s) (transverse) › congenital
- Horn › nail › congenital
- Hypoplasia, hypoplastic › nail (s)
- Koilonychia › congenital
- Longitudinal stripes or grooves, nails › congenital
- Malformation (congenital) › nail
- Malposition › congenital › nail (s)
- Onychodystrophy › congenital
- Onychorrhexis › congenital
- Persistence, persistent (congenital) › nail (s), anomalous
- Platyonychia (congenital)
- Polyunguia
- Remnant › fingernail › congenital
- Spading nail › congenital
- Spoon nail › congenital
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast
ICD-9-CM equivalent
Converter →- 757.5Specified anomalies of nailsapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about Q84.6
Is Q84.6 billable?
- Yes. Q84.6 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q84.6 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q84.6 as a principal diagnosis.
Is Q84.6 a CC or MCC?
- No. Q84.6 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does Q84.6 group to?
- Q84.6 is used in the MS-DRG v44.0 logic for MS-DRG 606 (Minor Skin Disorders with MCC) and MS-DRG 607 (Minor Skin Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for Q84.6?
- The CMS General Equivalence Mappings map Q84.6 to ICD-9-CM 757.5.