ICD-10-CM Diagnosis code G55

Nerve root and plexus compressions in diseases classified elsewhere

Code Hierarchy

Code Details

Body System Diseases of the nervous system and sense organs
Chronic Condition Yes

Coding Guidelines for G55

G55 is a valid ICD-10-CM diagnosis code meaning 'Nerve root and plexus compressions in diseases classified elsewhere'.

Purely Excluded Conditions

These diag codes should never be used at the same time as G55 because these conditions cannot occur together:

  • 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.-)

Must Code Etiology Before Coding G55

Some conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation.

G55 is a manifestation code. For it to be valid, one of the following etiology codes must also be coded first:

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

Complications & Comorbid Conditions (CC/MCC) Rules for G55

G55 is not a CC or MCC.

DRG Mapping Rules for G55

Diagnostic codes are the first step in the DRG mapping process.

The patient's primary diagnostic code is the most important. Assuming the patient's primary diagnostic code is G55, look in the list below to see which MDC's "Assignment of Diagnosis Codes" is first. That is the MDC that the patient will be grouped into.

From there, check the subsections of the MDC listed. The patient will be mapped into the first subsection for which the treatment performed on the patient meet the listed requirements of that subsection.

DRG grouping rules are adjusted each year, so make sure to check the rules for the fiscal year of the patient's discharge date.

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