G83.22
BillableMonoplegia of upper limb affecting left dominant side
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is G83.22 an HCC code?
Yes. G83.22 maps to Monoplegia, Other Paralytic Syndromes under the CMS-HCC V28 risk adjustment model (and Monoplegia, Other Paralytic Syndromes 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 G83.22
For G83.22 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 G83.22 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
G83.22 is the ICD-10-CM diagnosis code for monoplegia of upper limb affecting left dominant side. Weakness or paralysis affecting only the left arm in a person whose left side is their dominant side. G83.22 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, G83.22 maps to Monoplegia, Other Paralytic Syndromes (HCC 254) with a community, non-dual, aged base RAF weight of 0.000. Under the older V24 model, G83.22 mapped to the same category but with a base RAF weight of 0.304 — 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.
Confirm left dominance is documented in the patient's medical record before assigning this code. Because G83.22 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 G83.22 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Confirm left dominance is documented in the patient's medical record before assigning this code
- •Note the severity and functional limitations of the monoplegia to support clinical decision-making
Clinical Significance
Monoplegia of the upper limb affecting the left dominant side is an uncommon presentation occurring in left-handed patients who lose function in their primary hand. Like right dominant monoplegia, this severely impacts fine motor tasks, writing, and self-care, but it is seen less frequently given that only approximately 10% of the population is left-handed. Documentation must explicitly confirm left-hand dominance.
Documentation Requirements
- ✓Documentation of monoplegia isolated to the left upper extremity
- ✓Left-hand dominance explicitly documented
- ✓Underlying cause documented and coded
- ✓Motor examination findings
- ✓Functional limitations from loss of dominant hand
- ✓Occupational therapy and rehabilitation plan
- ✓Active management status