R83Header code — not billable
Abnormal findings in cerebrospinal fluid
- Chapter
- 18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Category
- R83
- Effective date
- October 1, 2026
Related codes in category R83
R83.0Abnormal level of enzymes in cerebrospinal fluidYesR83.1Abnormal level of hormones in cerebrospinal fluidYesR83.2Abn lev drug/meds/biol subst in cerebrospinal fluidYesR83.3Abn lev substances chiefly nonmedicinal as to source in CSFYesR83.4Abnormal immunological findings in cerebrospinal fluidYesR83.5Abnormal microbiological findings in cerebrospinal fluidYesR83.6Abnormal cytological findings in cerebrospinal fluidYesR83.8Other abnormal findings in cerebrospinal fluidYesR83.9Unspecified abnormal finding in cerebrospinal fluidYes
Frequently asked questions
What is ICD-10 code R83?
R83 is an ICD-10-CM diagnosis code for Abnormal findings in cerebrospinal fluid.
Is R83 a billable code?
No. R83 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is R83 in?
R83 falls under Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
When did R83 become effective?
R83 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to R83?
R83 belongs to category R83, which includes 9 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.