G81.94
BillableHemiplegia, unspecified affecting left nondominant side
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is G81.94 an HCC code?
Yes. G81.94 maps to Hemiplegia/Hemiparesis under the CMS-HCC V28 risk adjustment model (and Hemiplegia/Hemiparesis 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 G81.94
For G81.94to 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 G81.94 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
G81.94 is the ICD-10-CM diagnosis code for hemiplegia, unspecified affecting left nondominant side. Weakness or paralysis affecting the left side of the body, where the left side is the non-dominant side (not the person's preferred side for writing or fine motor tasks). G81.94 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering cerebral palsy and other paralytic syndromes (g80-g83).
Under the CMS-HCC V28 risk adjustment model, G81.94 maps to Hemiplegia/Hemiparesis (HCC 253) with a community, non-dual, aged base RAF weight of 0.387. Under the older V24 model, G81.94 mapped to the same category but with a base RAF weight of 0.437 — 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.
Verify documentation specifies left side and confirm it is indeed the non-dominant side for the patient. Because G81.94 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 G81.94 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify documentation specifies left side and confirm it is indeed the non-dominant side for the patient
- •This code is more specific than unspecified hemiplegia codes and should be used when laterality and dominance are documented
Clinical Significance
Unspecified hemiplegia affecting the left nondominant side is the most frequently encountered partially-specified hemiplegia code, occurring in right-handed patients with left-sided weakness. While the tone type remains unspecified, laterality and dominance are captured. These patients face significant mobility and balance challenges despite having their dominant arm unaffected. Provider query for tone classification should be pursued.
Documentation Requirements
- ✓Documentation of hemiplegia affecting the left side
- ✓Right-hand dominance documented (left is nondominant)
- ✓Clinical evidence supporting the diagnosis
- ✓Underlying etiology
- ✓Functional status and limitations
- ✓Active treatment or rehabilitation plan
Commonly Confused Codes
- •G81.04 Flaccid hemiplegia, left nondominant — use when flaccid tone is documented
- •G81.14 Spastic hemiplegia, left nondominant — use when spastic tone is documented
- •G81.92 Hemiplegia, unspecified, left dominant — left side in a left-handed person
- •I69.054 Hemiplegia following cerebrovascular disease, left nondominant — for stroke sequelae