2026 ICD-10-CM Diagnosis Code R94Abnormal results of function studies

ICD-10-CM Codes›R00–R99›R90-R94›R94

ICD-10-CM R94
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R94 is a non-billable ICD-10-CM category code for abnormal results of function studies, so it cannot be submitted on claims. Use a more specific code from this category instead, such as R94.01, R94.02, R94.09, and R94.110. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established.

Code Identity

ICD-10-CM Code
R94
Billable Status
No — Non-Billable Category
Code Describes
Abnormal results of function studies
Short Description
Abnormal results of function studies
Same as the full description in the CMS dataset.
Chapter
R90-R94
Abnormal findings on diagnostic imaging and in function studies, without diagnosis

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR90-R94Abnormal findings on diagnostic imaging and in function studies, without diagnosis
CategoryR94Abnormal results of function studies
This CodeR94Abnormal results of function studies

Specific Coding for Abnormal results of function studiesOverview

Non-specific codes like R94 require more characters. Use one of these billable codes instead:

  • R94.0 for Abnormal results of function studies of central nervous system

  • Use R94.01 for Abnormal electroencephalogram [EEG]

  • Use R94.02 for Abnormal brain scan

  • Use R94.09 for Abnormal results of other function studies of central nervous system

  • R94.1 for Abnormal results of function studies of peripheral nervous system and special senses

  • R94.11 for Abnormal results of function studies of eye

  • R94.12 for Abnormal results of function studies of ear and other special senses

  • R94.13 for Abnormal results of function studies of peripheral nervous system

  • Use R94.2 for Abnormal results of pulmonary function studies

  • R94.3 for Abnormal results of cardiovascular function studies

  • Use R94.30 for Abnormal result of cardiovascular function study, unspecified

  • Use R94.31 for Abnormal electrocardiogram [ECG] [EKG]

  • Use R94.39 for Abnormal result of other cardiovascular function study

  • Use R94.4 for Abnormal results of kidney function studies

  • Use R94.5 for Abnormal results of liver function studies

  • Use R94.6 for Abnormal results of thyroid function studies

  • Use R94.7 for Abnormal results of other endocrine function studies

  • Use R94.8 for Abnormal results of function studies of other organs and systems

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • abnormal results of radionuclide radioisotope uptake studies
  • abnormal results of scintigraphy

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R94Overview

Is R94 (Abnormal results of function studies) a billable code?

No. This is a category header that groups the codes for abnormal results of function studies, and headers cannot be submitted on claims. Claims for abnormal results of function studies need a more specific code from this category, such as R94.01, R94.02, and R94.09.

Can R94 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the abnormal results of function studies is established, that condition takes the principal position instead.