ICD-10-CM Code Also Notes · Chapter 6 · FY 2027 G00-G99
Code Also Notes in Chapter 6: Diseases of the nervous system ICD-10-CM
A Code Also note means two codes may be needed to fully describe a condition; it gives no sequencing direction. In Chapter 6 (G00-G99), notes printed in the chapter name other codes 44 times, and Code Also Notes anywhere in the Tabular List name the chapter’s codes 35 times, covering 24 distinct codes, categories and ranges. Switch views to read the list either way.
✓ From the official FY 2027 ICD-10-CM Tabular ListDefinitions follow the Official Guidelines, Section I.A
44
References in Its Notes
35
References to Its Codes
24
Chapter Codes Named
G00-G99
Chapter 6
Chapter 6
Code Also Notes by the code that carries the note
22 of 22 shown
- G31.2 Degeneration of nervous system due to alcohol
- associated alcoholism (F10.-)
- G37.81 Myelin oligodendrocyte glycoprotein antibody disease
- MERRF syndrome, if applicable (E88.42)
- , if applicable, associated epilepsy and recurrent seizures (G40.-)
- , if applicable, associated conditions such as dementia (F02.8-)
- the type of cerebral infarction (I63.-)
- associated premenstrual tension syndrome (N94.3)
- associated premenstrual tension syndrome (N94.3)
- related psychological factors associated with pain (F45.42)
- G93.45 Developmental and epileptic encephalopathy
- intracranial hypotension (G96.81-)
- G96.00 Cerebrospinal fluid leak, unspecified
- G96.08 Other cranial cerebrospinal fluid leak
- G96.09 Other spinal cerebrospinal fluid leak
- G96.11 Dural tear
- intracranial hypotension, if applicable (G96.81-)
- Brachial amyotrophy (G54.5)
- Cerebrospinal fluid leak from spine (G96.02)
- Cranial nerve disorders in diseases classified elsewhere (G53)
- Nerve root and compressions in diseases classified elsewhere (G55)
- Nonpyogenic thrombosis of intracranial venous system (I67.6)
- Nontraumatic intracerebral hemorrhage (I61.-)
- Nontraumatic subdural hemorrhage (I62.0-)
- Other and unspecified cord compression (G95.2-)
- Other secondary parkinsonism (G21.8)
- Reversible cerebrovascular vasoconstriction syndrome (I67.841)
- Spinal cord herniation (G95.89)
- Stroke (I63.-)
- Syringomyelia (G95.0)
- G97.0 Cerebrospinal fluid leak from spinal puncture
- G97.1 Other reaction to spinal and lumbar puncture
- , if applicable, any associated headache with orthostatic component (R51.0)
- G97.84 Intracranial hypotension following other procedure
- G04.81 Other encephalitis and encephalomyelitis
- G37.81 Myelin oligodendrocyte glycoprotein antibody disease: noninfectious acute disseminated encephalomyelitis (G04.81)
- G21.8 Other secondary parkinsonism
- G96.81 Intracranial hypotension: Other secondary parkinsonism (G21.8)
- G36.0 Neuromyelitis optica [Devic]
- G37.81 Myelin oligodendrocyte glycoprotein antibody disease: neuromyelitis optica (G36.0)
- E88.42 MERRF syndrome: progressive myoclonic epilepsy (G40.3-)
- E20.810 Autosomal dominant hypocalcemia: seizure disorder (G40.-, R56.9)
- F78.A1 SYNGAP1-related intellectual disability: epilepsy and recurrent seizures (G40.-)
- G04.8 Other encephalitis, myelitis and encephalomyelitis: any associated seizure (G40.-, R56.9)
- G40.5 Epileptic seizures related to external causes: , if applicable, associated epilepsy and recurrent seizures (G40.-)
- G43.1 Migraine with aura: any associated seizure (G40.-, R56.9)
- G93.45 Developmental and epileptic encephalopathy: epilepsy, by specific type (G40.-)
- I67.850 Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy: epilepsy (G40.-)
- Q87.85 MED13L syndrome: epilepsy and recurrent seizures (G40.-)
- QA0 Neurodevelopmental disorders related to specific genetic pathogenic variants: epilepsy, by specific type (G40.-)
- Z15.1 Genetic susceptibility to epilepsy and neurodevelopmental disorders: epilepsy, by specific type (G40.-)
- N94.3 Premenstrual tension syndrome: associated menstrual migraine (G43.82-, G43.83-)
- N94.3 Premenstrual tension syndrome: associated menstrual migraine (G43.82-, G43.83-)
- I27.23 Pulmonary hypertension due to lung diseases and hypoxia: sleep apnea (G47.3-)
- G53 Cranial nerve disorders in diseases classified elsewhere
- G96.81 Intracranial hypotension: Cranial nerve disorders in diseases classified elsewhere (G53)
- G54.5 Neuralgic amyotrophy
- G96.81 Intracranial hypotension: Brachial amyotrophy (G54.5)
- G55 Nerve root and plexus compressions in diseases classified elsewhere
- G96.81 Intracranial hypotension: Nerve root and compressions in diseases classified elsewhere (G55)
- F45.42 Pain disorder with related psychological factors: associated acute or chronic pain (G89.-)
- G93.45 Developmental and epileptic encephalopathy
- G93.49 Other encephalopathy
- E88.43 Disorders of mitochondrial tRNA synthetases: leukoencephalopathy (G93.49)
- F78.A1 SYNGAP1-related intellectual disability: encephalopathy (G93.4-)
- G93.6 Cerebral edema
- G92.0 Immune effector cell-associated neurotoxicity syndrome: cerebral edema (G93.6)
- G95.0 Syringomyelia and syringobulbia
- G96.81 Intracranial hypotension: Syringomyelia (G95.0)
- G96.81 Intracranial hypotension: Other and unspecified cord compression (G95.2-)
- G95.89 Other specified diseases of spinal cord
- G96.81 Intracranial hypotension: Spinal cord herniation (G95.89)
- G96.02 Spinal cerebrospinal fluid leak, spontaneous
- G96.81 Intracranial hypotension: Cerebrospinal fluid leak from spine (G96.02)
- G97.0 Cerebrospinal fluid leak from spinal puncture
- G97.84 Intracranial hypotension following other procedure: cerebrospinal fluid leak from spinal puncture (G97.0)
- G97.41 Accidental puncture or laceration of dura during a procedure
- G97.84 Intracranial hypotension following other procedure: accidental puncture or laceration of dura during a procedure (G97.41)
- G97.83-G97.84 Intracranial hypotension following lumbar cerebrospinal fluid shunting to Intracranial hypotension following other procedure 2 codes
- G97.0 Cerebrospinal fluid leak from spinal puncture: intracranial hypotension following a procedure (G97.83-G97.84)
The first view lists notes printed in this chapter (a note on a category or block applies to every code beneath it). The second lists codes of this chapter named by Code Also Notes anywhere in the Tabular List, including notes in other chapters.
Questions About Code Also Notes
What does a Code Also note mean?
A Code Also note instructs that two codes may be required to fully describe a condition, but it does not give sequencing direction (Section I.A.17). The FY 2027 Tabular List has 689 of them; 495 name other codes, with 538 references to 349 distinct codes, categories and ranges.
Which code goes first with a Code Also note?
The note does not decide it. Sequencing depends on the circumstances of the encounter: normally the condition that is the main reason for the visit goes first.
Related References
Source: FY 2027 ICD-10-CM Tabular List (CMS and NCHS) and the ICD-10-CM Official Guidelines for Coding and Reporting FY 2027, Section I.A. ICD List is not affiliated with CMS or NCHS.
