Q93.82Williams syndrome

Q93.82 is the ICD-10-CM diagnosis code for Williams syndrome. It belongs to category Q93 (Monosomies and deletions from the autosomes, not elsewhere classified), block Q90-Q99 (chromosomal abnormalities, not elsewhere classified) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Q93.8 (other deletions from the autosomes), Q93.82 is specifically for Williams syndrome. Related codes cover Velo-cardio-facial syndrome (Q93.81), other microdeletions (Q93.88) and other deletions from the autosomes (Q93.89).

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.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It was added in FY2019, effective October 1, 2018.