ICD-10-CM 2027 diagnosis code
G96.191Perineural cyst
G96.191 is a valid, billable ICD-10-CM code for perineural cyst. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code last changed in FY2021 (effective October 1, 2020). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About G96.191
G96.191 is the ICD-10-CM diagnosis code for Perineural cyst. It belongs to category G96 (other disorders of central nervous system), block G89-G99 (other disorders of the 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 G96.19 (other disorders of meninges, not elsewhere classified), G96.191 is specifically for Perineural cyst. Related codes cover other disorders of meninges, not elsewhere classified (G96.198).
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 091 (Other Disorders of Nervous System with MCC, relative weight 1.7046), DRG 092 (Other Disorders of Nervous System with CC, relative weight 1.0239) and DRG 093 (Other Disorders of Nervous System without CC/MCC, relative weight 0.7783), 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 was added in FY2021, effective October 1, 2020.
Coding notes
- Cervical nerve root cyst
- Lumbar nerve root cyst
- Sacral nerve root cyst
- Tarlov cyst
- Thoracic nerve root cyst
Notes that apply from higher levels
Instructions written at a parent level also apply to G96.191.
Broader instructions also apply from Chapter 6: Diseases of the nervous system.
Alphabetic index entries
6 entriesTerms in the official ICD-10-CM index that lead to G96.191.
- Cyst (colloid) (mucous) (simple) (retention) › nerve root › cervical
- Cyst (colloid) (mucous) (simple) (retention) › nerve root › lumbar
- Cyst (colloid) (mucous) (simple) (retention) › nerve root › sacral
- Cyst (colloid) (mucous) (simple) (retention) › nerve root › thoracic
- Cyst (colloid) (mucous) (simple) (retention) › perineural
- Cyst (colloid) (mucous) (simple) (retention) › Tarlov
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
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2021 (effective 10/1/2020): Added
- No changes since FY2021.
Common questions about G96.191
Is G96.191 billable?
- Yes. G96.191 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G96.191 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G96.191 as a principal diagnosis.
Is G96.191 a CC or MCC?
- No. G96.191 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does G96.191 group to?
- G96.191 is used in the MS-DRG v44.0 logic for MS-DRG 091 (Other Disorders of Nervous System with MCC), MS-DRG 092 (Other Disorders of Nervous System with CC) and MS-DRG 093 (Other Disorders of Nervous System without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.