Monosomies and deletions from the autosomes, not elsewhere classified (Q93) ICD-10-CM
The Q93 code range covers monosomies and deletions from the autosomes, not elsewhere classified with 17 ICD-10-CM diagnosis codes. 14 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the Q93 Range 17 codes · 14 billable
- Q93 Monosomies and deletions from the autosomes, not elsewhere classifiedNon-billable
- Q93.0 Whole chromosome monosomy, nonmosaicism (meiotic nondisjunction)
- Q93.1 Whole chromosome monosomy, mosaicism (mitotic nondisjunction)
- Q93.2 Chromosome replaced with ring, dicentric or isochromosome
- Q93.3 Deletion of short arm of chromosome 4
- Q93.4 Deletion of short arm of chromosome 5
- Q93.5 Other deletions of part of a chromosomeNon-billable
- Q93.51 Angelman syndrome
- Q93.52 Phelan-McDermid syndrome
- Q93.59 Other deletions of part of a chromosome
- Q93.7 Deletions with other complex rearrangements
- Q93.8 Other deletions from the autosomesNon-billable
- Q93.81 Velo-cardio-facial syndrome
- Q93.82 Williams syndrome
- Q93.88 Other microdeletions
- Q93.89 Other deletions from the autosomes
- Q93.9 Deletion from autosomes, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the Q93 range.
Angelman Syndrome
A syndrome characterized by multiple abnormalities, INTELLECTUAL DISABILITY, and movement disorders. Present usually are skull and other abnormalities, frequent infantile spasms (SPASMS, INFANTILE); easily provoked and prolonged paroxysms of laughter (hence happy); jerky puppetlike movements (hence puppet); continuous tongue protrusion; motor retardation; ATAXIA; MUSCLE HYPOTONIA; and a peculiar facies. It is associated with maternal deletions of chromosome 15q11-13 and other genetic abnormalities. (From Am J Med Genet 1998 Dec 4;80(4):385-90; Hum Mol Genet 1999 Jan;8(1):129-35)
Cri-du-Chat Syndrome
An infantile syndrome characterized by a cat-like cry, failure to thrive, microcephaly, MENTAL RETARDATION, spastic quadriparesis, micro- and retrognathia, glossoptosis, bilateral epicanthus, hypertelorism, and tiny external genitalia. It is caused by a deletion of the short arm of chromosome 5 (5p-).
Monosomy
The condition in which one chromosome of a pair is missing. In a normally diploid cell it is represented symbolically as 2N-1.
Phelan-McDermid Syndrome
An autosomal dominant condition caused by mutation(s) and or deletion of the SHANK3 gene, encoding SH3 and multiple ankyrin repeat domains protein 3. It is characterized by variable features, which may include intellectual disability, autism spectrum disorder, developmental delay and mild dysmorphic features.
Williams Syndrome
A disorder caused by hemizygous microdeletion of about 28 genes on chromosome 7q11.23, including the ELASTIN gene. Clinical manifestations include SUPRAVALVULAR AORTIC STENOSIS; MENTAL RETARDATION; elfin facies; impaired visuospatial constructive abilities; and transient HYPERCALCEMIA in infancy. The condition affects both sexes, with onset at birth or in early infancy.
About the Q93 Code Range
A whole autosome may be missing, part of one may be absent, or a chromosome may be replaced.
Q93 separates whole-chromosome monosomy into nonmosaic and mosaic forms. Other codes distinguish chromosome replacement, deletions on the short arm of chromosome 4 or 5, and deletions with complex rearrangements.
Codes for deletions of part of a chromosome identify Angelman syndrome and Phelan-McDermid syndrome. Other autosomal deletion codes identify velo-cardio-facial syndrome, Williams syndrome, and other microdeletions. A separate code identifies an unspecified autosomal deletion.
Questions About This Page
How many billable codes are in the Q93 range?
Of the 17 codes in this range, 14 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the Q93 range classify?
The range classifies monosomies and deletions from the autosomes, not elsewhere classified. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
