2025 ICD-10-CM code Q99.9
(Active) Effective Date: N/A Revision Date: N/A Deletion Date: N/A Congenital malformations, deformations and chromosomal abnormalities - Chromosomal abnormalities, not elsewhere classified Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99) Feed
This code represents an unspecified chromosomal abnormality.
Medical necessity for coding Q99.9 is established through thorough clinical evaluation and diagnostic testing indicating a chromosomal abnormality, even if the specific type is not identified. Documentation must support the clinical impression of a chromosomal abnormality and any interventions undertaken.
The clinical responsibility for coding Q99.9 falls on the physician or qualified healthcare professional involved in the patient's diagnosis and care.They must ensure appropriate documentation supports the use of this code, given its broad nature and the need for specificity whenever possible.
- Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- Q99 Other chromosome abnormalities, not elsewhere classified
In simple words: This code is used when a person has a chromosome problem that doctors can't identify more specifically. Chromosomes are parts of your cells that carry your genes.This code is for cases where something is wrong with the chromosomes, but the exact nature of the problem isn't known.
Q99.9, Chromosomal abnormality, unspecified, is an ICD-10-CM code used to classify chromosomal abnormalities that cannot be further specified.It is used when a more specific chromosomal abnormality code is not available or applicable.This code is part of the broader category of congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99).It should be used in situations where the specific type of chromosomal abnormality is unknown or cannot be determined.This code is not to be used on maternal records. It excludes inborn errors of metabolism (E70-E88) and mitochondrial metabolic disorders (E88.4-).
Example 1: A newborn infant presents with multiple congenital anomalies. Karyotyping is performed, but the results are inconclusive, and no specific chromosomal abnormality is identified. Q99.9 is used., A child exhibits developmental delays and intellectual disability.Genetic testing is attempted, but the results are non-diagnostic, revealing a chromosomal abnormality but not specifying the type. Q99.9 is the appropriate code., A patient presents with symptoms suggestive of a chromosomal abnormality, but the diagnostic testing is not yet complete.Q99.9 may be temporarily used while awaiting the definitive results.The code should be updated once a definitive diagnosis is known.
Thorough clinical documentation is crucial.This must include detailed descriptions of the presenting symptoms, any diagnostic tests performed (karyotype analysis, FISH, chromosomal microarray), and the results obtained.If the testing is incomplete or inconclusive, this should be clearly stated.
** This code is for use only when a more specific chromosomal abnormality cannot be identified.Always strive for the highest level of specificity in coding.Use of this code should be reviewed periodically in case additional information becomes available.
- Payment Status: Active
- Specialties:Medical Genetics, Cytogenetics, Pediatric Genetics, Clinical Genetics, Genetic Counseling
- Place of Service:Office, Inpatient Hospital, Outpatient Hospital, Genetics Clinic