ICD-10-CM 2027 diagnosis code
G04.1Tropical spastic paraplegia
G04.1 is a valid, billable ICD-10-CM code for tropical spastic paraplegia. 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 G04.1
G04.1 is the ICD-10-CM diagnosis code for tropical spastic paraplegia. It belongs to category G04 (encephalitis, myelitis and encephalomyelitis), block G00-G09 (inflammatory diseases of the central nervous system) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within G04 (encephalitis, myelitis and encephalomyelitis), G04.1 is specifically for tropical spastic paraplegia. Related codes cover acute disseminated encephalitis and encephalomyelitis (ADEM) (G04.0), bacterial meningoencephalitis and meningomyelitis, not elsewhere classified (G04.2), acute necrotizing hemorrhagic encephalopathy (G04.3), other encephalitis, myelitis and encephalomyelitis (G04.8) and unspecified (G04.9).
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 052 (Spinal Disorders and Injuries with CC/MCC, relative weight 1.7837) and DRG 053 (Spinal Disorders and Injuries without CC/MCC, relative weight 0.9728), 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 344.1 (paraplegia).
Notes that apply from higher levels
Instructions written at a parent level also apply to G04.1.
› From G04 Encephalitis, myelitis and encephalomyelitis
- acute ascending myelitis
- meningoencephalitis
- meningomyelitis
- encephalopathy NOS (G93.40)
Broader instructions also apply from Chapter 6: Diseases of the nervous system.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to G04.1.
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 →- 344.1Paraplegiaapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about G04.1
Is G04.1 billable?
- Yes. G04.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G04.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G04.1 as a principal diagnosis.
Is G04.1 a CC or MCC?
- G04.1 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does G04.1 group to?
- G04.1 is used in the MS-DRG v44.0 logic for MS-DRG 052 (Spinal Disorders and Injuries with CC/MCC) and MS-DRG 053 (Spinal Disorders and Injuries without CC/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 G04.1?
- The CMS General Equivalence Mappings map G04.1 to ICD-9-CM 344.1.