ICD-10 code for monosomy

The ICD-10-CM code for monosomy is Q93.9 (Deletion from autosomes, unspecified). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Q93.9.

Within Q93, choose Q93.9 (Deletion from autosomes, unspecified) only when documentation doesn't support a more specific option: whole chromosome monosomy, nonmosaicism (meiotic nondisjunction) (Q93.0), whole chromosome monosomy, mosaicism (mitotic nondisjunction) (Q93.1), chromosome replaced with ring, dicentric or isochromosome (Q93.2), deletion of short arm of chromosome 4 (Q93.3), deletion of short arm of chromosome 5 (Q93.4), other deletions of part of a chromosome (Q93.5), deletions with other complex rearrangements (Q93.7) and other deletions from the autosomes (Q93.8).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 884 (Organic Disturbances and Intellectual Disability, relative weight 1.6001), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.