Polyneuropathy in diseases classified elsewhere (G63) ICD-10-CM
The G63 code range covers polyneuropathy in diseases classified elsewhere with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
- underlying disease, such as:
- amyloidosis E85
- endocrine disease, except diabetes E00 E07 E15 E16 E20 E34
- metabolic diseases E70 E88
- neoplasm C00 D49
- nutritional deficiency E40 E64
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the G63 Range 1 codes · 1 billable
- G63 Polyneuropathy in diseases classified elsewhere
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the G63 range.
Herpesvirus 2, Gallid
The type species of the genus MARDIVIRUS in the family HERPESVIRIDAE. It is the etiologic agent of MAREK DISEASE, infecting domestic fowl and wild birds.
Neurolymphomatosis
Infiltration of the nervous system by malignant lymphoma cells.
Pellagra
A disease due to deficiency of NIACIN, a B-complex vitamin, or its precursor TRYPTOPHAN. It is characterized by scaly DERMATITIS which is often associated with DIARRHEA and DEMENTIA (the three D's).
POEMS Syndrome
A multisystemic disorder characterized by a sensorimotor polyneuropathy (POLYNEUROPATHIES), organomegaly, endocrinopathy, monoclonal gammopathy, and pigmentary skin changes. Other clinical features which may be present include EDEMA; CACHEXIA; microangiopathic glomerulopathy; pulmonary hypertension (HYPERTENSION, PULMONARY); cutaneous necrosis; THROMBOCYTOSIS; and POLYCYTHEMIA. This disorder is frequently associated with osteosclerotic myeloma. (From Adams et al., Principles of Neurology, 6th ed, p1335; Rev Med Interne 1997;18(7):553-62)
About the G63 Code Range
The ICD-10 code G63 is used to identify polyneuropathy that occurs as a complication of other underlying diseases. This code captures multiple types of peripheral nerve damage linked to various systemic illnesses rather than standalone neuropathies.
Polyneuropathy in diseases classified elsewhere includes a broad range of nerve disorders caused by conditions such as infections (e.g., cytomegaloviral polyneuropathy, leprosy neuropathy), metabolic problems (uremic neuropathy, neuropathy due to vitamin B or folic acid deficiency), autoimmune diseases (polyneuropathy in rheumatoid arthritis, lupus erythematosus), and toxic or nutritional deficiencies (toxic polyneuropathy, neuropathy due to obesity or micronutrient deficits). The term covers symptoms affecting multiple peripheral nerves, often described in clinical practice by its synonyms like “neuropathy associated with endocrine disorder” or “polyneuropathy related to collagen vascular disease.” Medical coders searching for the ICD-10 code for these neuropathies should recognize G63 as the appropriate choice when nerve damage springs from these broader illnesses rather than primary nerve conditions.
Questions About This Page
How many billable codes are in the G63 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the G63 range classify?
The range classifies polyneuropathy in diseases classified elsewhere. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
