ICD-10-CM 2027
ICD-10 code for Fit
From the official ICD-10-CM alphabetic index entry “Fit”. Page updated September 29, 2026.
About coding Fit
The ICD-10-CM code for Fit is R56.9 (Unspecified convulsions). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on R56.9.
Within R56, choose R56.9 (Unspecified convulsions) only when documentation doesn't support a more specific option: febrile convulsions (R56.0) and post traumatic seizures (R56.1).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 100 (Seizures with MCC, relative weight 1.9233), DRG 101 (Seizures without MCC, relative weight 0.8952), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 01 (Diseases and Disorders of the Nervous System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Fit codes (official index)
Common questions about Fit ICD-10 codes
What is the ICD-10 code for Fit?
- R56.9 — Unspecified convulsions. More specific codes apply when the documentation supports them: R55, F44.5, P90.
What is the ICD-10 code for fainting fit?
- R55 — Syncope and collapse.
What is the ICD-10 code for hysterical fit?
- F44.5 — Conversion disorder with seizures or convulsions.
What is the ICD-10 code for newborn fit?
- P90 — Convulsions of newborn.
Is R56.9 billable?
- Yes. R56.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R56.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R56.9 as a principal diagnosis.
Is R56.9 a CC or MCC?
- No. R56.9 is neither a CC nor an MCC under MS-DRG v44.0.