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ICD-10-CM 2027 diagnosis code

R56.01Complex febrile convulsions

✓ Billable / specificCC — complication/comorbidity

R56.01 is a valid, billable ICD-10-CM code for complex febrile convulsions. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About R56.01

R56.01 is the ICD-10-CM diagnosis code for complex febrile convulsions. It belongs to category R56 (convulsions, not elsewhere classified), block R50-R69 (general symptoms and signs) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R56.0 (febrile convulsions), R56.01 is specifically for complex febrile convulsions. Related codes cover simple febrile convulsions (R56.00).

Don't report R56.01 together with the conditions in its Excludes1 note: status epilepticus (G40.901).

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 100 (Seizures with MCC, relative weight 1.9233) and DRG 101 (Seizures without MCC, relative weight 0.8952), in MDC 01 (Diseases and Disorders of the Nervous System), 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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 780.32 (complex febrile convulsions).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Atypical febrile seizure
  • Complex febrile seizure
  • Complicated febrile seizure
Excludes1Not coded here — never report together with this code

Notes that apply from higher levels

Instructions written at a parent level also apply to R56.01.

› From R56 Convulsions, not elsewhere classified
Excludes1
  • dissociative convulsions and seizures (F44.5)
  • epileptic convulsions and seizures (G40.-)
  • newborn convulsions and seizures (P90)

Broader instructions also apply from Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to R56.01.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 01 · Diseases and Disorders of the Nervous System

ICD-9-CM equivalent

Converter →
  • 780.32Complex febrile convulsionsexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about R56.01

Is R56.01 billable?

Yes. R56.01 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R56.01 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R56.01 as a principal diagnosis.

Is R56.01 a CC or MCC?

R56.01 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does R56.01 group to?

R56.01 is used in the MS-DRG v44.0 logic for MS-DRG 100 (Seizures with MCC) and MS-DRG 101 (Seizures without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for R56.01?

The CMS General Equivalence Mappings map R56.01 to ICD-9-CM 780.32.