Skip to main content

G93.5 ICD-10-CM Code: Compression of brain

Compare with another codeCheck this code on a claim

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

Coding at a Glance

Tabular directives
4 inclusion terms · 1 Excludes1
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 80

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; the Instructions section marks which is which.

Excludes1Never report with this code
  • traumatic compression of brain (S06.A-)
IncludesWhat this code covers
  • Arnold-Chiari type 1 compression of brain
  • Compression of brain (stem)
  • Herniation of brain (stem)
  • Midline shift of brain

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

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 080 — NONTRAUMATIC STUPOR AND COMA WITH MCC (MDC 01)
  • MS-DRG 081 — NONTRAUMATIC STUPOR AND COMA WITHOUT 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.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 202 — Coma, Brain Compression/Anoxic Damage

Other models: CMS-HCC V22 HCC 80

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for G93.5 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.

  • Arnold-Chiari type 1 compression of brain
  • Compression of brain (stem)
  • Herniation of brain (stem)
  • Midline shift of brain

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Coder workflow for G93.5

MedCoder structured workflow — derived from this code’s own official record

Before you code G93.5

  1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with G93.5. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in G93.5’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewS06.A

Consider G93.5. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Official instructions as workflow

  • Excludes1 — check before selecting G93.5(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with G93.5: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareS06.A

    See the official tabular notes · Guidelines I.A.12.a

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition G93.5 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewS06.A

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse G93.5 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of G93.5 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • S06.A— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of traumatic compression of brain moves the case to S06.A; the two are not reported together unless documented as unrelated.

    Full comparison: G93.5 vs S06.A →

  • G93.4— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Other and unspecified encephalopathy” takes G93.4; specificity in the record moves it back here.

    Full comparison: G93.5 vs G93.4 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

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

Compression of brain is a billable ICD-10-CM diagnosis code (G93.5).

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

  • MCC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

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: MCC — Major Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 3 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 2 MS-DRGs: DRG 080 (MDC 01), DRG 081 (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 process (MS-DRG)

Acts as MCC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

G81.90 — Hemiplegia, unspecified affecting unspecified side, G93.82 — Brain death

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Coma, Brain Compression/Anoxic Damage) for risk-adjusted payment.

E03.5 — Myxedema coma, G93.1 — Anoxic brain damage, not elsewhere classified, G93.6 — Cerebral edema, P91.0 — Neonatal cerebral ischemia, P91.1 — Acquired periventricular cysts of newborn, P91.2 — Neonatal cerebral leukomalacia, P91.3 — Neonatal cerebral irritability, P91.4 — Neonatal cerebral depression, P91.5 — Neonatal coma, P91.60 — Hypoxic ischemic encephalopathy [HIE], unspecified, P91.61 — Mild hypoxic ischemic encephalopathy [HIE], P91.62 — Moderate hypoxic ischemic encephalopathy [HIE], P91.63 — Severe hypoxic ischemic encephalopathy [HIE], P91.811 — Neonatal encephalopathy in diseases classified elsewhere, P91.819 — Neonatal encephalopathy, unspecified, P91.88 — Other specified disturbances of cerebral status of newborn, P91.9 — Disturbance of cerebral status of newborn, unspecified, R40.20 — Unspecified coma, R40.2110 — Coma scale, eyes open, never, unspecified time, R40.2111 — Coma scale, eyes open, never, in the field [EMT or ambulance], +40 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Major Head Injury with Loss of Consciousness > 1 Hour, Major Head Injury with Loss of Consciousness < 1 Hour or Unspecified, Chronic Liver Failure/End-Stage Liver Disorders

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)).

G92.9 — Unspecified toxic encephalopathy, G93.0 — Cerebral cysts, G93.2 — Benign intracranial hypertension, G93.3 — Postviral and related fatigue syndromes, G93.31 — Postviral fatigue syndrome, G93.32 — Myalgic encephalomyelitis/chronic fatigue syndrome, G93.39 — Other post infection and related fatigue syndromes, G93.40 — Encephalopathy, unspecified, G93.41 — Metabolic encephalopathy, G93.49 — Other encephalopathy, G93.6 — Cerebral edema, G93.7 — Reye's syndrome, G93.81 — Temporal sclerosis, G93.82 — Brain death, G93.89 — Other specified disorders of brain, G93.9 — Disorder of brain, unspecified, G94 — Other disorders of brain in diseases classified elsewhere, G95.0 — Syringomyelia and syringobulbia, G95.11 — Acute infarction of spinal cord (embolic) (nonembolic), G95.19 — Other vascular myelopathies, +97 more

Same Index main term, other category

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

G52.3 — Disorders of hypoglossal nerve (cranial nerve, twelfth), G52.8 — Disorders of other specified cranial nerves (cranial nerve, eleventh), G52.9 — Cranial nerve disorder, unspecified (cranial nerve), G54.0 — Brachial plexus disorders (brachial plexus), G54.1 — Lumbosacral plexus disorders (lumbosacral plexus), G54.2 — Cervical root disorders, not elsewhere classified (cervical plexus), G54.9 — Nerve root and plexus disorder, unspecified (spinal, nerve root NOS), G58.9 — Mononeuropathy, unspecified (nerve), G83.4 — Cauda equina syndrome (cauda equina), G90.89 — Other disorders of autonomic nervous system (nerve, sympathetic), G95.20 — Unspecified cord compression (spinal), G95.29 — Other cord compression (spinal, specified NEC), H40.05 — Ocular hypertension (increased, intraocular), H61.111 — Acquired deformity of pinna, right ear (auricle, ear, acquired, right), H61.112 — Acquired deformity of pinna, left ear (auricle, ear, acquired, left), H61.113 — Acquired deformity of pinna, bilateral (auricle, ear, acquired, right, with left), H61.119 — Acquired deformity of pinna, unspecified ear (auricle, ear, acquired), H93.24 — Temporary auditory threshold shift (auditory threshold), I60.8 — Other nontraumatic subarachnoid hemorrhage (arteriovenous, aneurysmatic, brain, ruptured), I61.5 — Nontraumatic intracerebral hemorrhage, intraventricular (arteriovenous, aneurysmatic, brain, ruptured, intraventricular), +271 more

Contextual Map

Every relationship of G93.5 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.

Run G93.5 with this related code in Claim Check

Hierarchy

Excludes1

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 202 — Coma, Brain Compression/Anoxic Damage [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper

  • MCC — Major Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (MCC).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2027
  • DRG 080 — NONTRAUMATIC STUPOR AND COMA WITH MCC[MS-DRG]: “NONTRAUMATIC STUPOR AND COMA WITH MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
  • DRG 081 — NONTRAUMATIC STUPOR AND COMA WITHOUT MCC[MS-DRG]: “NONTRAUMATIC STUPOR AND COMA WITHOUT MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027

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 (14)

  • Chiari's, malformation, type I[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Compression, brain (stem)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Compression, brain (stem), nontraumatic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Hernia, hernial (acquired) (recurrent), foramen magnum[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Herniation, brain (stem)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Herniation, brain (stem), nontraumatic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Herniation, cerebral[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Herniation, cerebral, nontraumatic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • and 6 more

Nearest codes (23)

Change history (2)

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 (14)

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
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release 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 20, 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. "G93.5 — Compression of brain." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/g93.5-compression-of-brain

Change history

Changed in FY2027, the release in force: Inclusion term note added.

  • FY2027 — October 1, 2026
    Inclusion term note added
    Midline shift of brain
    FY2027 changes
  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Compression of brain

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G93.5 in its code family, with their registry titles.

View all codes in the G93 family