What does ICD-10 code R83 mean?

ICD-10 code R83 is the standardized code used for abnormal findings in cerebrospinal fluid in medical records and coding systems.

When is ICD-10 code R83 used?

Doctors, hospitals, and insurers may use ICD-10 code R83 when recording abnormal findings in cerebrospinal fluid in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code R83 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code R83: Abnormal findings in cerebrospinal fluid

Name: ICD-10 Code R83: Abnormal findings in cerebrospinal fluid
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:30:51.054Z

R83 is an ICD-10 diagnosis entry used to group records related to Abnormal findings in cerebrospinal fluid. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99).

When is it used?

May be used when a clinician documents abnormal findings in cerebrospinal fluid in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

18Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)

block

R83-R89Abnormal findings on examination of other body fluids, substances and tissues, without diagnosis

currentR83-R89

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

General Physician

Sibling codes

R84Abnormal findings in specimens from respiratory organs and thorax R85Abnormal findings in specimens from digestive organs and abdominal cavity R86Abnormal findings in specimens from male genital organs R87Abnormal findings in specimens from female genital organs R88Abnormal findings in other body fluids and substances R89Abnormal findings in specimens from other organs, systems and tissues

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

R83

Replacement codes

R83.0 — Abnormal level of enzymes in cerebrospinal fluidR83.1 — Abnormal level of hormones in cerebrospinal fluidR83.2 — Abnormal level of other drugs, medicaments and biological substances in cerebrospinal fluidR83.3 — Abnormal level of substances chiefly nonmedicinal as to source in cerebrospinal fluidR83.4 — Abnormal immunological findings in cerebrospinal fluidR83.5 — Abnormal microbiological findings in cerebrospinal fluidR83.6 — Abnormal cytological findings in cerebrospinal fluidR83.8 — Other abnormal findings in cerebrospinal fluidR83.9 — Unspecified abnormal finding in cerebrospinal fluid

Common synonyms

Abnormal findings in cerebrospinal fluid

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.