G83.9 ICD-10-CM Code: Paralytic syndrome, unspecified
G83.9 maps to CMS-HCC V28 254. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Cerebral palsy and other paralytic syndromes (G80-G83)
G83.9
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceParalytic syndrome, unspecified
Paralysis or weakness of muscles when the specific type or cause is not documented or identified.
Buddy Insight
Unspecified paralytic syndrome is the least specific code in the paralytic syndromes section, indicating documentation merely states the patient has some form of paralysis without characterizing the pattern, distribution, or cause.
CMS-HCC V28
MappedHCC 254
Coefficient HCC 254: 0.321 (Community Non-Dual Aged (CNA))
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 151
Code-level coefficient reference
ESRD/PACE
MappedHCC 104
Code-level coefficient reference
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for G83.9. Check the code and parent instructions in the Code Book.
Excludes 2
Official- certain conditions originating in the perinatal period (P04-P96)Inherited from G00-G99
- certain infectious and parasitic diseases (A00-B99)Inherited from G00-G99
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from G00-G99
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from G00-G99
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from G00-G99
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from G00-G99
- neoplasms (C00-D49)Inherited from G00-G99
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from G00-G99
Related Codes
Includes
Official- paralysis (complete) (incomplete), except as in G80-G82Inherited from G83
Excludes 1
OfficialNo Excludes 1 notes are included in this display for G83.9. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for G83.9. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for G83.9. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for G83.9. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is G83.9 an HCC code?
Yes. G83.9 (Paralytic syndrome, unspecified) maps to HCC 254, Monoplegia, Other Paralytic Syndromes under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.321. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.
Coder answer: G83.9 is billable and maps to V28 HCC 254, Monoplegia, Other Paralytic Syndromes. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- G83.9
- Description
- Paralytic syndrome, unspecified
- HCC (V28)
- HCC 254 — Monoplegia, Other Paralytic Syndromes
- RAF reference coefficient
- 0.321
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work G83.9 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for G83.9
For G83.9, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- 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
Coder workflow notes
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What This Code Means
G83.9 is the ICD-10-CM diagnosis code for paralytic syndrome, unspecified. Paralysis or weakness of muscles when the specific type or cause is not documented or identified. G83.9 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, G83.9 maps to Monoplegia, Other Paralytic Syndromes (HCC 254) with a source-labeled community, non-dual, aged reference coefficient of 0.321. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.
This is a last-resort code; query the provider if more specific information about the paralysis type is available. For G83.9, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. 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, source-labeled coefficient references, and MEAT documentation criteria for G83.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a last-resort code; query the provider if more specific information about the paralysis type is available
- •Avoid using this code if documentation supports a more specific paralytic syndrome diagnosis
Clinical Significance
Unspecified paralytic syndrome is the least specific code in the paralytic syndromes section, indicating documentation merely states the patient has some form of paralysis without characterizing the pattern, distribution, or cause. This code should be a last resort and represents a significant documentation improvement opportunity. Even basic clinical examination can typically identify the pattern of paralysis sufficiently to assign a more specific code.
Documentation Requirements
- ✓Documentation of paralysis or paralytic syndrome
- ✓Clinical evidence supporting the diagnosis
- ✓Any available information about distribution, etiology, or pattern
- ✓Functional impact
- ✓Active management plan
Commonly Confused Codes
- •G83.89 Other specified paralytic syndromes: use when a specific syndrome is identified but not listed
- •G81.90 Hemiplegia, unspecified: use when one-sided paralysis is documented
- •G82.20 Paraplegia, unspecified: use when both legs are affected
- •G82.50 Quadriplegia, unspecified: use when all four limbs are affected
- •M62.81 Muscle weakness: nonspecific weakness, not paralysis
- •R29.818 Other symptoms involving the nervous and musculoskeletal systems: symptom-level code