G93.6 ICD-10-CM Code: Cerebral edema
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Other disorders of the nervous system (G89-G99)
G93.6
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceCerebral edema
Swelling of the brain tissue due to fluid accumulation, which can result from injury, infection, or other medical conditions.
Buddy Insight
Cerebral edema represents pathological accumulation of fluid within the brain parenchyma, leading to increased intracranial pressure and potential brain herniation.
CMS-HCC V28
MappedHCC 202
RAF 0.0
CMS-HCC V24
MappedHCC 80
RAF 0.546
ACA/HHS
00
RAF 0
ESRD/PACE
MappedHCC 80
RAF 0.0
RXHCC
00
RAF 0
Code Trumping
Basket needed
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for G93.6 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for G93.6 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for G93.6 in this effective period.
Excludes 1
Official- cerebral edema due to birth injury (P11.0)
- traumatic cerebral edema (S06.1-)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for G93.6 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for G93.6 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for G93.6 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is G93.6 an HCC code?
Yes. G93.6 maps to Coma, Brain Compression/Anoxic Damage under the CMS-HCC V28 risk adjustment model (and Coma, Brain Compression/Anoxic Damage under V24).
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for G93.6
For G93.6to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed G93.6 during that encounter, not just copy-forwarded from a problem list.
What This Code Means
G93.6 is the ICD-10-CM diagnosis code for cerebral edema. Swelling of the brain tissue due to fluid accumulation, which can result from injury, infection, or other medical conditions. G93.6 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering other disorders of the nervous system (g89-g99).
Under the CMS-HCC V28 risk adjustment model, G93.6 maps to Coma, Brain Compression/Anoxic Damage (HCC 202) with a community, non-dual, aged base RAF weight of 0.000. Under the older V24 model, G93.6 mapped to the same category but with a base RAF weight of 0.546, V28 recalibrated weights across the entire model. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Specify the underlying cause when documented (trauma, infection, hypoxia, etc.) as this may require an additional code. Because G93.6 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G93.6 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Specify the underlying cause when documented (trauma, infection, hypoxia, etc.) as this may require an additional code
- •Distinguish between cerebral edema as a primary condition versus a manifestation of another disease
Clinical Significance
Cerebral edema represents pathological accumulation of fluid within the brain parenchyma, leading to increased intracranial pressure and potential brain herniation. It occurs in numerous clinical contexts including stroke, trauma, infection, metabolic derangements, and high-altitude exposure. This is a serious condition requiring urgent medical management and close monitoring to prevent permanent brain damage or death.
Documentation Requirements
- ✓Imaging evidence of cerebral edema (CT or MRI showing diffuse or focal brain swelling)
- ✓Clinical context and identified underlying cause of the edema
- ✓Neurological examination including level of consciousness and signs of increased intracranial pressure
- ✓Treatment measures implemented (osmotic therapy, steroids, surgical decompression)
- ✓Monitoring plan and response to treatment documentation
Excludes 1, Do NOT code together
Commonly Confused Codes
- •G93.5: Compression of brain: mechanical compression by external mass, not intrinsic swelling of brain tissue
- •G93.1: Anoxic brain damage: may cause edema, but represents the primary injury from hypoxia
- •S06.1X0A: Traumatic cerebral edema, initial encounter: use when edema is due to acute trauma
- •G93.41: Metabolic encephalopathy: metabolic dysfunction causing brain dysfunction without necessarily causing edema