2026 ICD-10-CM Diagnosis Code Q84.3Anonychia
ICD-10-CM Codes›Q00-Q99›Q80-Q89›Q84
- Billable — Valid for Submission
- POA Exempt
- Not Chronic
Q84.3 is a billable ICD-10-CM diagnosis code for anonychia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified congenital anomalies.
Code Identity
Code Classification
Present on Admission (POA)Billing
Q84.3 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anonychia
- Anonychia with bizarre flexural pigmentation
- Anonychia with microcephaly syndrome
- Aplasia of nail unit
- Aplasia of toenail
- Congenital absence of fingernail of little finger
- Congenital absence of nail unit of digit of hand
- Congenital absence of thumb nail
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- nail patella syndrome Q87.2
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Anonychia (congenital) - Q84.3
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Agenesis
- nail (s)
- Anonychia(congenital)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Nail Diseases
Your toenails and fingernails protect the tissues of your toes and fingers. They are made up of layers of a hardened protein called keratin, which is also in your hair and skin. The health of your nails can be a clue to your overall health. Healthy nails are usually smooth and consistent in color.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Q84.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q84.3Overview
Is Q84.3 (Other congenital malformations of integument) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report anonychia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does Q84.3 group to?
When anonychia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.
Is Q84.3 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for anonychia on inpatient claims.
What is the ICD-9 equivalent of Q84.3?
Under the General Equivalence Mappings, anonychia converts to ICD-9-CM 757.5 (nail anomalies NEC). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
