2027 ICD-10-CM Diagnosis Code G55Nerve root and plexus compressions in diseases classified elsewhere

ICD-10-CM Codes›G00–G99›G50-G59›G55

ICD-10-CM G55
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G55 is a billable ICD-10-CM diagnosis code for nerve root and plexus compressions in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 73 through 74. The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as nerve root and plexus compressions in neoplastic disease. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nerve and nerve root disorders.

Code Identity

ICD-10-CM Code
G55
Billable Status
Yes — Valid for Submission
Code Describes
Nerve root and plexus compressions in diseases classified elsewhere
Short Description
Nerve root and plexus compressions in diseases classd elswhr
Chapter
G50-G59
Nerve, nerve root and plexus disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG55Nerve root and plexus compressions in diseases classified elsewhere
This CodeG55Nerve root and plexus compressions in diseases classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for G55.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Nerve root and plexus compressions in neoplastic disease

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G55: its own notes plus those printed at block G50-G59 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.

On G55 itself
  • nerve root compression (due to) (in) ankylosing spondylitis (M45.-)
  • nerve root compression (due to) (in) dorsopathies (M53.-, M54.-)
  • nerve root compression (due to) (in) intervertebral disc disorders (M50.1.-, M51.1.-)
  • nerve root compression (due to) (in) spondylopathies (M46.-, M48.-)
  • nerve root compression (due to) (in) spondylosis (M47.0-, M47.2.-)
From Block G50-G59 Nerve, nerve root and plexus disorders applies to 106 codes
  • current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
  • neuralgia NOS (M79.2)
  • neuritis NOS (M79.2)
  • peripheral neuritis in pregnancy (O26.82-)
  • radiculitis NOS (M54.1-)

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.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • 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)

Code First

The underlying condition named in the note is sequenced before this code.

  • underlying disease, such as:
  • neoplasm (C00-D49)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name G55, its category, or a range that includes it.

Code Also 1

These codes say G55 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • G96.81 Intracranial hypotension
    Nerve root and compressions in diseases classified elsewhere (G55)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS017
Nerve and nerve root disorders
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Peripheral Nerve Disorders

Nerves are like wires that carry messages back and forth between your brain and your body. Your peripheral nerves branch off from your brain and spinal cord and connect to all parts of your body, including your muscles and organs.

The full article covers:

  • What are peripheral nerves?
  • What are peripheral nerve disorders?
  • What causes peripheral nerve disorders?
  • What are the symptoms of peripheral nerve disorders?
  • How are peripheral nerve disorders diagnosed?
  • What are the treatments for peripheral nerve disorders?
  • Can peripheral nerve disorders be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G55 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
353.8 Nerv root/plexus dis NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G55Overview

What is the ICD-10 code for nerve root and plexus compressions in diseases classified elsewhere?

The ICD-10-CM code for nerve root and plexus compressions in diseases classified elsewhere is G55. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is G55 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report nerve root and plexus compressions in diseases classified elsewhere on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does G55 group to?

On inpatient claims, nerve root and plexus compressions in diseases classified elsewhere maps to MS-DRG 74, 73, with relative weights from 1.0172 to 1.5773 depending on complications. Higher weights mean higher Medicare reimbursement.

Can G55 be a principal diagnosis?

No. This is a manifestation code: nerve root and plexus compressions in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

Can G55 be reported with a code from M45?

Not as a rule. The Excludes1 note on G55 lists "nerve root compression (due to) (in) ankylosing spondylitis (M45.-)". 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).