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G96.191 ICD-10-CM Code: Perineural cyst

Compare with another code for G96.191Check this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Official instructions
5 inclusion terms

What these terms mean →

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

IncludesWhat this code covers
  • Cervical nerve root cyst
  • Lumbar nerve root cyst
  • Sacral nerve root cyst
  • Tarlov cyst

+1 more in Instructions

Where it sits Source: CMS/NCHS

Under:Chapter 6: Diseases of the Nervous SystemG89-G99 Other disorders of the nervous systemG96 Other disorders of central nervous systemG96.1 Disorders of meninges, not elsewhere classifiedG96.19 Other disorders of meninges, not elsewhere classified

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Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 091 — OTHER DISORDERS OF NERVOUS SYSTEM WITH MCC (MDC 01)
  • MS-DRG 092 — OTHER DISORDERS OF NERVOUS SYSTEM WITH CC (MDC 01)
  • MS-DRG 093 — OTHER DISORDERS OF NERVOUS SYSTEM WITHOUT CC/MCC (MDC 01)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for G96.191 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Cervical nerve root cyst
  • Lumbar nerve root cyst
  • Sacral nerve root cyst
  • Tarlov cyst
  • Thoracic nerve root cyst

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Perineural cyst is a billable ICD-10-CM diagnosis code (G96.191).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 3 MS-DRGs: DRG 091 (MDC 01), DRG 092 (MDC 01), DRG 093 (MDC 01).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):NVS020 — Other nervous system disorders (neither hereditary nor degenerative) (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other nervous system disorders (neither hereditary nor degenerative)).

G95.9 — Disease of spinal cord, unspecified, G96.0 — Cerebrospinal fluid leak, G96.00 — Cerebrospinal fluid leak, unspecified, G96.01 — Cranial cerebrospinal fluid leak, spontaneous, G96.02 — Spinal cerebrospinal fluid leak, spontaneous, G96.08 — Other cranial cerebrospinal fluid leak, G96.09 — Other spinal cerebrospinal fluid leak, G96.11 — Dural tear, G96.12 — Meningeal adhesions (cerebral) (spinal), G96.19 — Other disorders of meninges, not elsewhere classified, G96.198 — Other disorders of meninges, not elsewhere classified, G96.8 — Other specified disorders of central nervous system, G96.810 — Intracranial hypotension, unspecified, G96.811 — Intracranial hypotension, spontaneous, G96.819 — Other intracranial hypotension, G96.89 — Other specified disorders of central nervous system, G96.9 — Disorder of central nervous system, unspecified, G98.0 — Neurogenic arthritis, not elsewhere classified, G98.8 — Other disorders of nervous system, G99.8 — Other specified disorders of nervous system in diseases classified elsewhere, +97 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Cyst”; these codes share that main term but sit in a different category of the Tabular List.

D39.10 — Neoplasm of uncertain behavior of unspecified ovary (multilocular), D73.4 — Cyst of spleen (spleen NEC), E04.1 — Nontoxic single thyroid nodule (thyroid), E21.4 — Other specified disorders of parathyroid gland (parathyroid), E23.6 — Other disorders of pituitary gland (pituitary), E27.8 — Other specified disorders of adrenal gland (adrenal gland), E32.8 — Other diseases of thymus (thymus), E34.8 — Other specified endocrine disorders (epiphysis cerebri), G93.0 — Cerebral cysts (dura), G95.89 — Other specified diseases of spinal cord (cauda equina), H02.821 — Cysts of right upper eyelid (eyelid, right, upper), H02.822 — Cysts of right lower eyelid (eyelid, right, lower), H02.823 — Cysts of right eye, unspecified eyelid (eyelid, right), H02.824 — Cysts of left upper eyelid (eyelid, left, upper), H02.825 — Cysts of left lower eyelid (eyelid, left, lower), H02.826 — Cysts of left eye, unspecified eyelid (eyelid, left), H02.829 — Cysts of unspecified eye, unspecified eyelid (eyelid), H04.13 — Lacrimal cyst (lacrimal, gland), H05.81 — Cyst of orbit (orbit), H11.44 — Conjunctival cysts (conjunctiva), +195 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Partial Thromboplastin Time (PTT) Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of G96.191 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 8,919 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Cyst (colloid) (mucous) (simple) (retention), nerve root, cervical[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Cyst (colloid) (mucous) (simple) (retention), nerve root, lumbar[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Cyst (colloid) (mucous) (simple) (retention), nerve root, sacral[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Cyst (colloid) (mucous) (simple) (retention), nerve root, thoracic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Cyst (colloid) (mucous) (simple) (retention), perineural[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Cyst (colloid) (mucous) (simple) (retention), Tarlov[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (19)

Change history

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (6)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "G96.191 — Perineural cyst." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/g96.191-perineural-cyst

Change history

  • FY2021 — October 1, 2020
    Added to the code set
    Perineural cyst
    FY2021 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G96.191 in its code family, with their registry titles.

View all codes in the G96 family