ICD-10 · PDGM grouping
G89-G99 — Other disorders of the nervous system
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.2.26.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in range
112
No clinical group
23
A period cannot be grouped from these.
Barred as primary
6
CMS rejects these in the primary position.
Where these codes group
73 of the 112 codes in G89-G99 group to Neuro Rehabilitation, but the range is not uniform — it spreads across 2 clinical groups. A further 23 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Code families in G89-G99
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- G89Pain, not elsewhere classified10 codes
- G90Disorders of autonomic nervous system21 codes
- G91Hydrocephalus7 codes
- G92Toxic encephalopathy8 codes
- G93Other disorders of brain20 codes
- G94Other disorders of brain in diseases classified elsewhere1 code
- G95Other and unspecified diseases of spinal cord8 codes
- G96Other disorders of central nervous system14 codes
- G97Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified18 codes
- G98Other disorders of nervous system not elsewhere classified2 codes
- G99Other disorders of nervous system in diseases classified elsewhere3 codes
Every code in G89-G99
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| G890 | Central pain syndrome | A | Can lead a claim |
| G8911 | Acute pain due to trauma | A | Can lead a claim |
| G8912 | Acute post-thoracotomy pain | A | Can lead a claim |
| G8918 | Other acute postprocedural pain | A | Can lead a claim |
| G8921 | Chronic pain due to trauma | A | Can lead a claim |
| G8922 | Chronic post-thoracotomy pain | A | Can lead a claim |
| G8928 | Other chronic postprocedural pain | A | Can lead a claim |
| G8929 | Other chronic pain | A | Can lead a claim |
| G893 | Neoplasm related pain (acute) (chronic) | A | Can lead a claim |
| G894 | Chronic pain syndrome | A | Can lead a claim |
| G9001 | Carotid sinus syncope | B | Can lead a claim |
| G9009 | Other idiopathic peripheral autonomic neuropathy | B | Can lead a claim |
| G901 | Familial dysautonomia [Riley-Day] | B | Can lead a claim |
| G902 | Horner's syndrome | B | Can lead a claim |
| G903 | Multi-system degeneration of the autonomic nervous system | B | Can lead a claim |
| G904 | Autonomic dysreflexia | B | Can lead a claim |
| G9050 | Complex regional pain syndrome I, unspecified | None | Cannot lead a claim |
| G90511 | Complex regional pain syndrome I of right upper limb | B | Can lead a claim |
| G90512 | Complex regional pain syndrome I of left upper limb | B | Can lead a claim |
| G90513 | Complex regional pain syndrome I of upper limb, bilateral | B | Can lead a claim |
| G90519 | Complex regional pain syndrome I of unspecified upper limb | None | Cannot lead a claim |
| G90521 | Complex regional pain syndrome I of right lower limb | B | Can lead a claim |
| G90522 | Complex regional pain syndrome I of left lower limb | B | Can lead a claim |
| G90523 | Complex regional pain syndrome I of lower limb, bilateral | B | Can lead a claim |
| G90529 | Complex regional pain syndrome I of unspecified lower limb | None | Cannot lead a claim |
| G9059 | Complex regional pain syndrome I of other specified site | B | Can lead a claim |
| G9081 | Serotonin syndrome | B | Can lead a claim, code first applies |
| G9089 | Other disorders of autonomic nervous system | B | Can lead a claim |
| G909 | Disorder of the autonomic nervous system, unspecified | None | Cannot lead a claim |
| G90A | Postural orthostatic tachycardia syndrome [POTS] | B | Can lead a claim |
| G90B | LMNB1-related autosomal dominant leukodystrophy | B | Can lead a claim |
| G910 | Communicating hydrocephalus | B | Can lead a claim |
| G911 | Obstructive hydrocephalus | B | Can lead a claim |
| G912 | (Idiopathic) normal pressure hydrocephalus | B | Can lead a claim |
| G913 | Post-traumatic hydrocephalus, unspecified | B | Can lead a claim |
| G914 | Hydrocephalus in diseases classified elsewhere | None | Cannot lead a claim |
| G918 | Other hydrocephalus | B | Can lead a claim |
| G919 | Hydrocephalus, unspecified | None | Cannot lead a claim |
| G9200 | Immune effor cell-associated neurotoxicity synd, grade unsp | None | Cannot lead a claim |
| G9201 | Immune effector cell-associated neurotoxicity synd, grade 1 | None | Cannot lead a claim |
| G9202 | Immune effector cell-associated neurotoxicity synd, grade 2 | None | Cannot lead a claim |
| G9203 | Immune effector cell-associated neurotoxicity synd, grade 3 | None | Cannot lead a claim |
| G9204 | Immune effector cell-associated neurotoxicity synd, grade 4 | None | Cannot lead a claim |
| G9205 | Immune effector cell-associated neurotoxicity synd, grade 5 | None | Cannot lead a claim |
| G928 | Other toxic encephalopathy | None | Cannot lead a claim |
| G929 | Unspecified toxic encephalopathy | None | Cannot lead a claim |
| G930 | Cerebral cysts | B | Can lead a claim |
| G931 | Anoxic brain damage, not elsewhere classified | B | Can lead a claim |
| G932 | Benign intracranial hypertension | B | Can lead a claim |
| G9331 | Postviral fatigue syndrome | B | Can lead a claim |
| G9332 | Myalgic encephalomyelitis/chronic fatigue syndrome | B | Can lead a claim |
| G9339 | Other post infection and related fatigue syndromes | B | Can lead a claim |
| G9340 | Encephalopathy, unspecified | B | Can lead a claim |
| G9341 | Metabolic encephalopathy | B | Can lead a claim |
| G9342 | Megalencephalic leukoencephalopathy with subcortical cysts | B | Can lead a claim |
| G9343 | Leukoencephalopathy with calcifications and cysts | B | Can lead a claim |
| G9344 | Adult-onset leukodystrophy with axonal spheroids | B | Can lead a claim |
| G9345 | Developmental and epileptic encephalopathy | B | Can lead a claim |
| G9349 | Other encephalopathy | B | Can lead a claim |
| G935 | Compression of brain | B | Can lead a claim |
| G936 | Cerebral edema | B | Can lead a claim |
| G937 | Reye's syndrome | B | Can lead a claim, code first applies |
| G9381 | Temporal sclerosis | B | Can lead a claim |
| G9382 | Brain death | None | Cannot lead a claim |
| G9389 | Other specified disorders of brain | B | Can lead a claim |
| G939 | Disorder of brain, unspecified | None | Cannot lead a claim |
| G94 | Other disorders of brain in diseases classified elsewhere | None | Cannot lead a claim |
| G950 | Syringomyelia and syringobulbia | B | Can lead a claim |
| G9511 | Acute infarction of spinal cord (embolic) (nonembolic) | B | Can lead a claim |
| G9519 | Other vascular myelopathies | B | Can lead a claim |
| G9520 | Unspecified cord compression | None | Cannot lead a claim |
| G9529 | Other cord compression | B | Can lead a claim |
| G9581 | Conus medullaris syndrome | B | Can lead a claim |
| G9589 | Other specified diseases of spinal cord | B | Can lead a claim |
| G959 | Disease of spinal cord, unspecified | None | Cannot lead a claim |
| G9600 | Cerebrospinal fluid leak, unspecified | A | Can lead a claim |
| G9601 | Cranial cerebrospinal fluid leak, spontaneous | A | Can lead a claim |
| G9602 | Spinal cerebrospinal fluid leak, spontaneous | A | Can lead a claim |
| G9608 | Other cranial cerebrospinal fluid leak | A | Can lead a claim |
| G9609 | Other spinal cerebrospinal fluid leak | A | Can lead a claim |
| G9611 | Dural tear | B | Can lead a claim |
| G9612 | Meningeal adhesions (cerebral) (spinal) | B | Can lead a claim |
| G96191 | Perineural cyst | A | Can lead a claim |
| G96198 | Other disorders of meninges, not elsewhere classified | B | Can lead a claim |
| G96810 | Intracranial hypotension, unspecified | B | Can lead a claim |
| G96811 | Intracranial hypotension, spontaneous | B | Can lead a claim |
| G96819 | Other intracranial hypotension | B | Can lead a claim |
| G9689 | Other specified disorders of central nervous system | B | Can lead a claim |
| G969 | Disorder of central nervous system, unspecified | None | Cannot lead a claim |
| G970 | Cerebrospinal fluid leak from spinal puncture | B | Can lead a claim |
| G971 | Other reaction to spinal and lumbar puncture | B | Can lead a claim |
| G972 | Intracranial hypotension following ventricular shunting | B | Can lead a claim |
| G9731 | Intraop hemor/hemtom of a nervous sys org comp nrv sys proc | B | Can lead a claim |
| G9732 | Intraop hemor/hemtom of a nervous sys org comp oth procedure | B | Can lead a claim |
| G9741 | Accidental puncture or laceration of dura during a procedure | B | Can lead a claim |
| G9748 | Acc pnctr & lac of nervous sys org during a nervous sys proc | B | Can lead a claim |
| G9749 | Acc pnctr & lac of nervous sys org during oth procedure | B | Can lead a claim |
| G9751 | Postproc hemor of a nervous sys org fol a nervous sys proc | B | Can lead a claim |
| G9752 | Postproc hemor of a nervous sys org fol other procedure | B | Can lead a claim |
| G9761 | Postp hematoma of a nervous sys org fol a nervous sys proc | B | Can lead a claim |
| G9762 | Postproc hematoma of a nervous sys org fol other procedure | B | Can lead a claim |
| G9763 | Postproc seroma of a nervous sys org fol a nervous sys proc | B | Can lead a claim |
| G9764 | Postproc seroma of a nervous sys org fol other procedure | B | Can lead a claim |
| G9781 | Other intraoperative complications of nervous system | B | Can lead a claim |
| G9782 | Oth postproc complications and disorders of nervous sys | B | Can lead a claim |
| G9783 | Intracranial hypotension following lumbar CSF shunting | B | Can lead a claim |
| G9784 | Intracranial hypotension following other procedure | B | Can lead a claim |
| G980 | Neurogenic arthritis, not elsewhere classified | B | Can lead a claim |
| G988 | Other disorders of nervous system | B | Can lead a claim |
| G990 | Autonomic neuropathy in diseases classified elsewhere | None | Cannot lead a claim |
| G992 | Myelopathy in diseases classified elsewhere | None | Cannot lead a claim |
| G998 | Oth disrd of nervous system in diseases classified elsewhere | None | Cannot lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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