Q93: Monosomies and deletions from the autosomes, not elsewhere classified

Codes under Q93 (Monosomies and deletions from the autosomes, not elsewhere classified). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	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 chromosome	—
Q93.7	Deletions with other complex rearrangements	✓
Q93.8	Other deletions from the autosomes	—
Q93.9	Deletion from autosomes, unspecified	✓
Q93.51	Angelman syndrome	✓
Q93.52	Phelan-McDermid syndrome	✓
Q93.59	Other deletions of part of a chromosome	✓
Q93.81	Velo-cardio-facial syndrome	✓
Q93.82	Williams syndrome	✓
Q93.88	Other microdeletions	✓
Q93.89	Other deletions from the autosomes	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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