Q84.4 — Congenital leukonychia
Q84.4 is a billable, specific ICD-10-CM code for congenital leukonychia. It is valid for submission on a claim.
Risk adjustment
Q84.4 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
Q84.4 is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52998Billing and Coding: Surgical Treatment of Nails
- A57666Billing and Coding: Surgical Treatment of Nails
- A59028Billing and Coding: Surgical Treatment of Nails
How Q84.4 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Q84.4.
- Leukonychia›congenital
- Leukopathia unguium›congenital
Related codes at this level
Codes that share Q84. If Q84.4 is not quite right, the correct code is usually one of these.
- Q84.0Congenital alopecia
- Q84.1Congenital morphological disturbances of hair, not elsewhere classified
- Q84.2Other congenital malformations of hair
- Q84.3Anonychia
- Q84.5Enlarged and hypertrophic nails
- Q84.6Other congenital malformations of nails
- Q84.8Other specified congenital malformations of integument
- Q84.9Congenital malformation of integument, unspecified
Questions about Q84.4
- Is Q84.4 a billable ICD-10-CM code?
- Yes. Q84.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does Q84.4 sit in the tabular list?
- Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Other congenital malformations (Q80-Q89).