G99

Classification

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Coding Guidance

G99 should not be used for reimbursement purposes as there are more specific codes below it that contain a greater level of detail.

Excludes 2

From G00-G99

P04-P96certain conditions originating in the perinatal period

A00-B99certain infectious and parasitic diseases

O00-O9Acomplications of pregnancy, childbirth and the puerperium

Q00-Q99congenital malformations, deformations, and chromosomal abnormalities

E00-E88endocrine, nutritional and metabolic diseases

S00-T88injury, poisoning and certain other consequences of external causes

C00-D49neoplasms

R00-R94symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

More Specific Codes

G99.0

Autonomic neuropathy in diseases classified elsewhere

G99.2

Myelopathy in diseases classified elsewhere

G99.8

Other specified disorders of nervous system in diseases classified elsewhere

External Resources

2025 ICD-10 guidelines from CMS.gov