Other disorders of brain in diseases classified elsewhere
In Other disorders of the nervous system (G89-G99), chapter 6: Diseases of the Nervous System
- G94 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under G89-G99 below.
- As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
- Can't be the principal diagnosis: code the underlying condition first. (Manifestation list)
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Instructional notes
Excludes1: not coded here, use a different code
Code first: code the underlying condition first, then this code
- underlying disease
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers default dominant or nondominant side for hemiplegia and monoplegia, and use and sequencing of G89 pain codes, including postoperative, chronic, and neoplasm-related pain.
- Dominant/nondominant side (page 45)
- Pain - Category G89 (page 45)
Other codes under G89-G99
Other disorders of the nervous system (G89-G99)
- G89Pain, not elsewhere classified
- G90Disorders of autonomic nervous system
- G91Hydrocephalus
- G92Toxic encephalopathy
- G93Other disorders of brain
- G94Other disorders of brain in diseases classified elsewhere(this code)
- G95Other and unspecified diseases of spinal cord
- G96Other disorders of central nervous system
- G97Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified
- G98Other disorders of nervous system not elsewhere classified
- G99Other disorders of nervous system in diseases classified elsewhere
G94 MS-DRGs
As the principal diagnosis, G94 groups to MS-DRG 056 or 057 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
G94 is in Other nervous system disorders (neither hereditary nor degenerative) (NVS020), with 111 codes. Others in it:
- A17.89 Other tuberculosis of nervous system
- A17.9 Tuberculosis of nervous system, unspecified
- B27.01 Gammaherpesviral mononucleosis with polyneuropathy
- B27.11 Cytomegaloviral mononucleosis with polyneuropathy
- B27.81 Other infectious mononucleosis with polyneuropathy
- B27.91 Infectious mononucleosis, unspecified with polyneuropathy
- E08.40 Diabetes mellitus due to underlying condition with diabetic neuropathy, unspecified
- E08.44 Diabetes mellitus due to underlying condition with diabetic amyotrophy
Medicare coverage articles listing G94
These 4 Medicare billing and coding articles list G94 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
Other codes that refer to G94
Notes on these codes point to G94.
- G93.4 Excludes2: encephalopathy in diseases classified elsewhere (G94)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Brain Diseases
Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body. Your nerves take in information from your senses and send it to the brain to be processed. Your brain and nerves also communicate to help you move and to control your body's functions.
Read more about brain diseases on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 331.7 Cerebral degeneration in diseases classified elsewhere (approximate)