Q99.8
Other specified chromosome abnormalities
Q99.8 is a non-billable ICD-10-CM code header for other specified chromosome abnormalities. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are Q99.81 Usher syndrome and Q99.89 Other specified chromosome abnormalities. Its coding notes include 2 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (2 notes)
- mitochondrial metabolic disorders (E88.4-)
- inborn errors of metabolism (E70-E88)
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 6 entries
- Abnormal, abnormality, abnormalities, chromosome, chromosomal, sex
- Abnormal, abnormality, abnormalities, chromosome, chromosomal, specified NEC
- Additional, chromosome (s)
- Anomaly, anomalous (congenital) (unspecified type), chromosomes, chromosomal, specified NEC
- Syndrome, due to abnormality, chromosomal, specified NEC
- Translocation, chromosomes NEC