G93.5
Compression of brain
G93.5 (also written G935) is a billable ICD-10-CM diagnosis code for compression of brain. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 20 codes in category G93 (Other disorders of brain). The Alphabetic Index lists it under 14 entries. Its coding notes include 1 Excludes1 entry and 8 Excludes2 entries.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- traumatic compression of brain (S06.A-)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Neuro Rehabilitation clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026IRF 60% Rule
On the CMS list of diagnoses used to determine presumptive compliance with the IRF 60 percent rule.
Source: CMS IRF Presumptive Compliance-3, FY 2027 IRF PPS final rule files, effective for discharges on or after October 1, 2026Hospital MCC
Counts as a major complication or comorbidity (MCC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 3 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CInclusion terms
Conditions classified to this code.
- Arnold-Chiari type 1 compression of brain
- Compression of brain (stem)
- Herniation of brain (stem)
- Midline shift of brain
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 14 entries
- Chiari's, malformation, type I
- Compression, brain (stem)
- Compression, brain (stem), nontraumatic
- Hernia, hernial (acquired) (recurrent), foramen magnum
- Herniation, brain (stem)
- Herniation, brain (stem), nontraumatic
- Herniation, cerebral
- Herniation, cerebral, nontraumatic
- Malformation (congenital), Chiari, Type I
- Pressure, brain
- Pressure, cone, tentorial
- Shift, midline, brain