ICD-10-CM 2027
ICD-10 code for Phelan-McDermid syndrome
From the official ICD-10-CM alphabetic index entry “Phelan-McDermid syndrome”. Page updated September 29, 2026.
About coding Phelan-McDermid syndrome
The ICD-10-CM code for Phelan-McDermid syndrome is Q93.52 (Phelan-McDermid syndrome).
Within Q93.5 (other deletions of part of a chromosome), Q93.52 is specifically for Phelan-McDermid syndrome. Related codes cover Angelman syndrome (Q93.51) and other deletions of part of a chromosome (Q93.59).
Use an additional code(s) to identify any associated conditions, such as: autism spectrum disorder (F84.0), degree of intellectual disabilities (F70-F79), epilepsy and recurrent seizures (G40.-) and lymphedema (I89.0).
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.
Common questions about Phelan-McDermid syndrome ICD-10 codes
What is the ICD-10 code for Phelan-McDermid syndrome?
- Q93.52 — Phelan-McDermid syndrome.
Is Q93.52 billable?
- Yes. Q93.52 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q93.52 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q93.52 as a principal diagnosis.
Is Q93.52 a CC or MCC?
- Q93.52 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.