ICD-10-CM 2027
ICD-10 code for Williams syndrome
From the official ICD-10-CM alphabetic index entry “Syndrome › Williams”. Page updated September 29, 2026.
About coding Williams syndrome
The ICD-10-CM code for Williams syndrome is Q93.82 (Williams syndrome).
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.
Common questions about Williams syndrome ICD-10 codes
What is the ICD-10 code for Williams syndrome?
- Q93.82 — Williams syndrome.
Is Q93.82 billable?
- Yes. Q93.82 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q93.82 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q93.82 as a principal diagnosis.
Is Q93.82 a CC or MCC?
- Q93.82 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.