G93.5
BillableCompression of brain
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is G93.5 an HCC code?
Yes. G93.5 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 G93.5
For G93.5 to 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 G93.5 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
G93.5 is the ICD-10-CM diagnosis code for compression of brain. Pressure on the brain from a tumor, bleeding, swelling, or other mass that can cause neurological symptoms. G93.5 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, G93.5 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, G93.5 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.
Always identify and code the underlying cause of compression (neoplasm, hematoma, edema, etc.). Because G93.5 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 G93.5 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always identify and code the underlying cause of compression (neoplasm, hematoma, edema, etc.)
- •Document the location and severity of compression based on imaging findings
Clinical Significance
Compression of brain is a serious and often emergent condition where increased pressure from mass lesions, hemorrhage, edema, or other space-occupying processes causes displacement and dysfunction of brain tissue. This can lead to herniation syndromes, which are life-threatening without intervention. The code reflects a high-acuity clinical scenario requiring urgent neurosurgical evaluation and management.
Documentation Requirements
- ✓Imaging (CT or MRI) demonstrating mass effect with brain compression or midline shift
- ✓Identification of the cause of compression (tumor, hemorrhage, abscess, edema)
- ✓Clinical neurological assessment including level of consciousness and herniation signs
- ✓Urgency of presentation and any emergent interventions performed
- ✓Documentation of the compressing lesion as a separate diagnosis code
Excludes 1 — Do NOT code together
- traumatic compression of brain (S06.A-)
Commonly Confused Codes
- •G93.6 — Cerebral edema: swelling of brain tissue itself, may cause compression but is a different mechanism
- •G93.1 — Anoxic brain damage: oxygen deprivation injury, not mechanical compression
- •S06.1X0A — Traumatic cerebral edema: use when compression is due to acute trauma
- •G95.20 — Unspecified cord compression: compression of spinal cord, not brain