R83 Abnormal findings in cerebrospinal fluid

The ICD-10-CM code for Abnormal findings in cerebrospinal fluid is R83 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

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

Section

R83-R89: Abnormal findings on examination of other body fluids, substances and tissues, without diagnosis (R83-R89)

Category R83

10 codes (9 billable)

FY2026 Status

Stable since FY2024

Official Coding Guidelines

Repeated falls vs history of falling

d. Repeated falls Code R29.6, Repeated falls, is for use for encounters when a patient has recently fallen and the reason for the fall is being investigated. Code Z91.81, History of falling, is for use when a patient has fallen in the past and is at risk for future falls. When appropriate, both codes R29.6 and Z91.81 may be assigned together.

Use of R40.20 unspecified coma; do not report for induced/sedated

e. Coma Code R40.20, Unspecified coma, should be assigned when the underlying cause of the coma is not known, or the cause is a traumatic brain injury and the coma scale is not documented in the medical record. Do not report codes for unspecified coma, individual or total Glasgow coma scale scores for a patient with a medically induced coma or a sedated patient.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool

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R83 — Abnormal findings in cerebrospinal fluid. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/R83

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