DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

G93 Other disorders of brain

  • Header · not billable

G93 is not billable. The category heads 20 billable codes in FY2027, grouped under 10 subdivisions.

ICD-10 code by name

What is the ICD-10 code for idiopathic intracranial hypertension?
Idiopathic intracranial hypertension ICD-10 code: G93.2 Benign intracranial hypertension. Alphabetic Index: Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)benign, intracranial → G93.2. Search ICD-10 for idiopathic intracranial hypertension
What is the ICD-10 code for intracranial hypertension?
Intracranial hypertension ICD-10 code: G93.2 Benign intracranial hypertension. Alphabetic Index: Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)benign, intracranial → G93.2. Search ICD-10 for intracranial hypertension

Where it sits

  1. Chapter 6 Diseases of the nervous system (G00-G99)
  2. G89-G99 Other disorders of the nervous system (G89-G99)
  3. G93 Other disorders of brain
Billable codes
20
Subdivisions
10
CC / MCC codes
7 / 5
HCC V28 codes
8
New FY2027
0
Index entries
118

Codes in G93

  1. G93.0
    Cerebral cysts
    Billable
    Inclusion terms 2, Excludes1 2

    Inclusion terms

    • Arachnoid cyst
    • Porencephalic cyst, acquired

    Excludes1

    • acquired periventricular cysts of newborn (P91.1) P91.1
    • congenital cerebral cysts (Q04.6) Q04.6
  2. G93.1
    Anoxic brain damage, not elsewhere classified
    BillableCC202
    Excludes1 3

    Excludes1

    • cerebral anoxia due to anesthesia during labor and delivery (O74.3) O74.3
    • cerebral anoxia due to anesthesia during the puerperium (O89.2) O89.2
    • neonatal anoxia (P84) P84
  3. G93.2
    Benign intracranial hypertension
    Billable
    Inclusion terms 1, Excludes1 2

    Inclusion terms

    • Pseudotumor

    Excludes1

    • hypertensive encephalopathy (I67.4) I67.4
    • obstructive hydrocephalus (G91.1) G91.1
  4. G93.3
    Postviral and related fatigue syndromes
    Header
    Excludes1 2, Use additional code 1

    Excludes1

    • chronic fatigue NOS (R53.82) R53.82
    • neurasthenia (F48.8) F48.8

    Use additional code

    • code, if applicable, for post COVID-19 condition, unspecified (U09.9) U09.9
  5. G93.31
    Postviral fatigue syndrome
    Billable
  6. G93.32
    Myalgic encephalomyelitis/chronic fatigue syndrome
    Billable
    Inclusion terms 3

    Inclusion terms

    • Chronic fatigue syndrome
    • ME/CFS
    • Myalgic encephalomyelitis
  7. G93.39
    Other post infection and related fatigue syndromes
    Billable
  8. G93.4
    Other and unspecified encephalopathy
    Header
    Excludes2 4

    Excludes2

    • alcoholic encephalopathy (G31.2) G31.2
    • encephalopathy in diseases classified elsewhere (G94) G94
    • hypertensive encephalopathy (I67.4) I67.4
    • toxic (metabolic) encephalopathy (G92.8) G92.8
  9. G93.40
    Encephalopathy, unspecified
    BillableCC
  10. G93.41
    Metabolic encephalopathy
    BillableMCC
    Inclusion terms 1

    Inclusion terms

    • Septic encephalopathy
  11. G93.42
    Megalencephalic leukoencephalopathy with subcortical cysts
    BillableCC200
  12. G93.43
    Leukoencephalopathy with calcifications and cysts
    BillableCC200
  13. G93.44
    Adult-onset leukodystrophy with axonal spheroids
    BillableCC200
    Inclusion terms 1

    Inclusion terms

    • Adult-onset leukoencephalopathy with axonal spheroids and pigmented glia
  14. G93.45
    Developmental and epileptic encephalopathy
    BillableCC201
    Inclusion terms 1, Code also 7

    Inclusion terms

    • Early infantile epileptic encephalopathy

    Code also

    • , if applicable, associated disorders such as:
    • developmental disorders of scholastic skills (F81.-) F81
    • developmental disorder of speech and language (F80.-) F80
    • epilepsy, by specific type (G40.-) G40
    • intellectual disabilities (F70-F79) F70 F79
    • other neurodevelopmental disorder (F88) F88
    • pervasive developmental disorders (F84.-) F84
  15. G93.49
    Other encephalopathy
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Encephalopathy NEC
  16. G93.5
    Compression of brain
    BillableMCC202
    Inclusion terms 4, Excludes1 1

    Inclusion terms

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

    Excludes1

    • traumatic compression of brain (S06.A-) S06.A
  17. G93.6
    Cerebral edema
    BillableMCC202
    Excludes1 2

    Excludes1

    • cerebral edema due to birth injury (P11.0) P11.0
    • traumatic cerebral edema (S06.1-) S06.1
  18. G93.7
    Reye's syndrome
    BillableMCC127
    Code first 1, Use additional code 1

    Code first

    • poisoning due to salicylates, if applicable (T39.0-, with sixth character 1-4) T39.0

    Use additional code

    • code for adverse effect due to salicylates, if applicable (T39.0-, with sixth character 5) T39.0
  19. G93.8
    Other specified disorders of brain
    Header
  20. G93.81
    Temporal sclerosis
    Billable
    Inclusion terms 2

    Inclusion terms

    • Hippocampal sclerosis
    • Mesial temporal sclerosis
  21. G93.82
    Brain death
    BillableMCC
  22. G93.89
    Other specified disorders of brain
    Billable
    Inclusion terms 1

    Inclusion terms

    • Postradiation encephalopathy
  23. G93.9
    Disorder of brain, unspecified
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

Notes that also apply

Chapter 6 instructions (Excludes2 8): printed on the chapter 6 page.

Index entries

  • Pseudohydrocephalus → G93.2
  • Pseudotumor → G93.2
  • Symond's syndrome → G93.2
  • ME/CFS (myalgic encephalomyelitis/chronic fatigue syndrome) → G93.32
  • SEID (systemic exertion intolerance disease) → G93.32
  • Systemic exertion intolerance disease [SEID] → G93.32
  • Akureyri's disease → G93.39
  • Neuromyasthenia (epidemic) (postinfectious) → G93.39
  • Encephalopathy (acute) → G93.40
  • Leukoencephalopathy → G93.49
  • Reye's syndrome → G93.7
  • Automatism → G93.89
  • Ependymopathy → G93.89
  • Gliosis (cerebral) → G93.89
  • Pneumocephalus → G93.89
  • Cyst (colloid) (mucous) (simple) (retention)arachnoid, brain (acquired) → G93.0
  • Cyst (colloid) (mucous) (simple) (retention)brain (acquired) → G93.0
  • Cyst (colloid) (mucous) (simple) (retention)choroid plexus → G93.0
  • Cyst (colloid) (mucous) (simple) (retention)corpora quadrigemina → G93.0
  • Cyst (colloid) (mucous) (simple) (retention)cranial meninges → G93.0
  • Cyst (colloid) (mucous) (simple) (retention)dura (cerebral) → G93.0
  • Cyst (colloid) (mucous) (simple) (retention)membrane, brain → G93.0
  • Cyst (colloid) (mucous) (simple) (retention)meninges (cerebral) → G93.0
  • Cyst (colloid) (mucous) (simple) (retention)subdural (cerebral) → G93.0
  • Porencephaly (congenital) (developmental) (true)acquired → G93.0
  • Porencephaly (congenital) (developmental) (true)nondevelopmental → G93.0
  • Anoxia (pathological)cerebral → G93.1
  • Hydrocephalus (acquired) (external) (internal) (malignant) (recurrent)otitic → G93.2
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)benign, intracranial → G93.2
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)intracranial, benign → G93.2
  • Increase, increasedintracranial pressure (benign) → G93.2
  • Increase, increasedpressure, intracranial → G93.2
  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)serous NEC → G93.2
  • Pseudotumorcerebri → G93.2
  • Syndromeserous meningitis → G93.2
  • SyndromeSymond's → G93.2
  • Syndromepostviral NEC → G93.31
  • Encephalomyelitismyalgic → G93.32
  • Disease, diseasedIceland → G93.39
  • Syndromepostbacterial fatigue → G93.39

78 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy