2027 ICD-10-CM Diagnosis Code G93.81Temporal sclerosis

ICD-10-CM Codes›G00–G99›G89-G99›G93

ICD-10-CM G93.81
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G93.81 is a billable ICD-10-CM diagnosis code for temporal sclerosis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 70 through 72. Coders also document this condition as epilepsy co-occurrent and due to mesial temporal sclerosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (neither hereditary nor degenerative).

Code Identity

ICD-10-CM Code
G93.81
Billable Status
Yes — Valid for Submission
Code Describes
Temporal sclerosis
Short Description
Temporal sclerosis
Same as the full description in the CMS dataset.
Parent Code
G93.8
Other specified disorders of brain

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG93Other disorders of brain
This CodeG93.81Temporal sclerosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Epilepsy co-occurrent and due to mesial temporal sclerosis
  • Mesial temporal lobe epilepsy
  • Mesial temporal lobe epilepsy with hippocampal sclerosis
  • Mesial temporal lobe sclerosis
  • Structural abnormality of hippocampus
  • Temporal lobe epilepsy with mesial temporal sclerosis
  • Temporal lobe sclerosis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G93.81: its own notes plus those printed at Chapter 6. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Hippocampal sclerosis
  • Mesial temporal sclerosis

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • 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)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name G93.81, its category, or a range that includes it.

Excludes2 3

These codes carry an Excludes2 note naming G93.81: its condition is not part of those codes, and both may be reported when the patient has both.

  • G40 Epilepsy and recurrent seizures
    hippocampal sclerosis (G93.81)
  • G40 Epilepsy and recurrent seizures
    mesial temporal sclerosis (G93.81)
  • G40 Epilepsy and recurrent seizures
    temporal sclerosis (G93.81)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS020
Other nervous system disorders (neither hereditary nor degenerative)
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Temporal Lobe Sclerosis

    a neurological condition caused by scarring and degeneration of the temporal lobe. it is characterized by cognitive and behavioral symptoms, and focal epilepsy.

Patient EducationClinical

Brain Diseases

Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G93.81 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
348.81 Temporal sclerosis
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G93.81Overview

What is the ICD-10 code for temporal sclerosis?

The ICD-10-CM code for temporal sclerosis is G93.81 (sometimes written as G9381). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is G93.81 (Other specified disorders of brain) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report temporal sclerosis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does G93.81 group to?

When temporal sclerosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 72, 70, 71, with relative weights from 0.7344 to 1.6089 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of G93.81?

Under the General Equivalence Mappings, temporal sclerosis converts to ICD-9-CM 348.81 (temporal sclerosis). The mapping is a direct match.