2027 ICD-10-CM Diagnosis Code G82.51Quadriplegia, C1-C4 complete
ICD-10-CM Codes›G00–G99›G80-G83›paraparesis
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 180
- Chronic Condition
G82.51 is a billable ICD-10-CM diagnosis code for quadriplegia, C1-C4 complete. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 52 through 53. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 136 closely related codes. Coders also document this condition as acute complete quadriplegia due to spinal cord lesion between first and fourth cervical vertebra. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Paralysis (other than cerebral palsy).
For Medicare Advantage risk adjustment, G82.51 maps to CMS-HCC Category 180 (Quadriplegia) under the V28 model, adding a risk factor of about 1.125 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
G82.51 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.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute complete quadriplegia due to spinal cord lesion between first and fourth cervical vertebra
- Acute paralysis due to lesion of spinal cord
- Complete tetraplegia due to lesion at C1-C4 level
- Tetraplegic spinal paralysis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G82.51: its own notes plus those printed at G82 and Chapter 6. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name G82.51, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming G82.51: they are not reported together with it, unless the two conditions are unrelated.
Use Additional Code 6
These codes say to use an additional code from the note, and G82.51 is one of the codes named.
- I69.06 Other paralytic syndrome following nontraumatic subarachnoid hemorrhagequadriplegia (G82.5-) names G82.5-, which includes this code
- I69.16 Other paralytic syndrome following nontraumatic intracerebral hemorrhagequadriplegia (G82.5-) names G82.5-, which includes this code
- I69.26 Other paralytic syndrome following other nontraumatic intracranial hemorrhagequadriplegia (G82.5-) names G82.5-, which includes this code
- I69.36 Other paralytic syndrome following cerebral infarctionquadriplegia (G82.5-) names G82.5-, which includes this code
- I69.86 Other paralytic syndrome following other cerebrovascular diseasequadriplegia (G82.5-) names G82.5-, which includes this code
- I69.96 Other paralytic syndrome following unspecified cerebrovascular diseasequadriplegia (G82.5-) names G82.5-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
C1-C4 level G82.51
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Quadriplegia
severe or complete loss of motor function in all four limbs which may result from brain diseases; spinal cord diseases; peripheral nervous system diseases; neuromuscular diseases; or rarely muscular diseases. the locked-in syndrome is characterized by quadriplegia in combination with cranial muscle paralysis. consciousness is spared and the only retained voluntary motor activity may be limited eye movements. this condition is usually caused by a lesion in the upper brain stem which injures the descending cortico-spinal and cortico-bulbar tracts.
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 G82.51 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G82.51Overview
What is the ICD-10 code for quadriplegia, C1-C4 complete?
The ICD-10-CM code for quadriplegia, C1-C4 complete is G82.51 (sometimes written as G8251). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G82.51 (Quadriplegia) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report quadriplegia, C1-C4 complete on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G82.51 group to?
When quadriplegia, C1-C4 complete is the principal diagnosis on an inpatient stay, it groups to MS-DRG 53, 52, with relative weights from 0.9723 to 1.7843 depending on complications. Higher weights mean higher Medicare reimbursement.
Is G82.51 a CC or MCC?
CMS lists G82.51 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 136 closely related codes in its exclusion list.
Can G82.51 be reported with a code from G80?
Not as a rule. The Excludes1 note at G82, which applies to G82.51, lists "congenital cerebral palsy (G80.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What HCC is G82.51?
G82.51 (quadriplegia, C1-C4 complete) maps to CMS-HCC Category 180 (Quadriplegia), commonly written as HCC 180, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 70 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 G82.51 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, G82.51 adds a risk adjustment factor of about 1.125 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.735 to 1.399 depending on the payment segment). A more severe related category (HCC 191 and HCC 192) supersedes it when both are reported. See the full factor table on the HCC 180 category page.
