2027 ICD-10-CM Diagnosis Code G83.31Monoplegia, unspecified affecting right dominant side
ICD-10-CM Codes›G00–G99›G80-G83›G83
- Billable — Valid for Submission
- Risk Adjusts — HCC 254
- Chronic Condition
G83.31 is a billable ICD-10-CM diagnosis code for monoplegia, unspecified affecting right dominant side. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Paralysis (other than cerebral palsy).
For Medicare Advantage risk adjustment, G83.31 maps to CMS-HCC Category 254 (Monoplegia, Other Paralytic Syndromes) under the V28 model, adding a risk factor of about 0.321 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
G83.31 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G83.31: its own notes plus those printed at G83 and Chapter 6. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
General instructions on how these codes are used.
- This category is to be used only when the listed conditions are reported without further specification, or are stated to be old or longstanding but of unspecified cause. The category is also for use in multiple coding to identify these conditions resulting from any cause.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Monoplegia
paralysis that affects one limb.
Patient EducationClinical
Paralysis
Paralysis is the loss of muscle function in part of your body. It happens when something goes wrong with the way messages pass between your brain and muscles. Paralysis can be complete or partial. It can occur on one or both sides of your body. It can also occur in just one area, or it can be widespread.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G83.31 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G83.31Overview
What is the ICD-10 code for monoplegia, unspecified affecting right dominant side?
The ICD-10-CM code for monoplegia, unspecified affecting right dominant side is G83.31 (sometimes written as G8331). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G83.31 (Monoplegia, unspecified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report monoplegia, unspecified affecting right dominant side on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G83.31 group to?
When monoplegia, unspecified affecting right dominant side is the principal diagnosis on an inpatient stay, it groups to MS-DRG 91, 92, 93, with relative weights from 0.7783 to 1.7050 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of G83.31?
Under the General Equivalence Mappings, monoplegia, unspecified affecting right dominant side converts to ICD-9-CM 344.5 (monoplegia NOS). The mapping is approximate, so confirm the match fits the documentation.
What HCC is G83.31?
G83.31 (monoplegia, unspecified affecting right dominant side) maps to CMS-HCC Category 254 (Monoplegia, Other Paralytic Syndromes), commonly written as HCC 254, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 104 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does G83.31 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, G83.31 adds a risk adjustment factor of about 0.321 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.000 to 0.365 depending on the payment segment). A more severe related category (HCC 180, HCC 181, HCC 191, HCC 192, and HCC 253) supersedes it when both are reported. See the full factor table on the HCC 254 category page.
