Alphabetic Index FY2027

G55

Nerve root and plexus compressions in diseases classified elsewhere

FY2027Chapter 6: Diseases of the nervous system/G50–G59 Nerve, nerve root and plexus disorders

BillableComplete code, valid to report
Care settingsHospice: not accepted as primary

G55 is a billable ICD-10-CM diagnosis code for nerve root and plexus compressions in diseases classified elsewhere. It is part of the FY2027 code set, effective October 1, 2026. The Alphabetic Index lists it under 2 entries. Its coding notes include a Code first instruction, 10 Excludes1 entries and 8 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

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

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code
  • 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.-)
Also from chapter/block level (5 notes)
Inherited from G50–G59 Nerve, nerve root and plexus disorders
  • 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. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (8 notes)
Inherited from Chapter 6 Diseases of the nervous system
  • 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)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Hospice: not accepted as primary

Not accepted as the principal diagnosis on a hospice claim (bill types 081x and 082x). The Integrated OCE returns an edit for this code.
Reason: Manifestation code. Report the underlying condition first (see the Code first note).

Source: CMS Integrated Outpatient Code Editor (IOCE) v27.3, effective October 1, 2026, edit 86

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 2 entries