Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94) ICD-10-CM
The R90–R94 section covers abnormal findings on diagnostic imaging and in function studies, without diagnosis with 85 ICD-10-CM diagnosis codes, of which 64 are billable in fiscal year 2026. The section is organized into the 5 code ranges listed below.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- nonspecific abnormal findings on diagnostic imaging by computerized axial tomography [CAT scan]
- nonspecific abnormal findings on diagnostic imaging by magnetic resonance imaging [MRI][NMR]
- nonspecific abnormal findings on diagnostic imaging by positron emission tomography [PET scan]
- nonspecific abnormal findings on diagnostic imaging by thermography
- nonspecific abnormal findings on diagnostic imaging by ultrasound [echogram]
- nonspecific abnormal findings on diagnostic imaging by X-ray examination
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- abnormal findings on antenatal screening of mother O28
- diagnostic abnormal findings classified elsewhere - see Alphabetical Index
Code Ranges in This Section 5 ranges · 85 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the R90–R94 Code Range
ICD-10 codes R90-R94 cover abnormal findings on diagnostic imaging and function studies when no specific diagnosis is established. These codes capture unusual results from scans or tests of various body systems, including the brain, lungs, breast, and others, helping document unexplained abnormalities detected during medical evaluations.
This range includes codes for abnormal imaging findings of the central nervous system like R90 for intracranial lesions and R90.81 for abnormal echoencephalograms, also referred to as abnormal brain ultrasounds. Lung abnormalities without diagnosis are coded under R91, such as solitary pulmonary nodules (R91.1). Breast imaging irregularities, including mammographic microcalcifications (R92.0) and inconclusive mammograms (R92.2), are also included. Other codes document unexpected imaging results in organs like the heart (R93.1), liver (R93.2), and kidneys (R93.4), or musculoskeletal findings (R93.6 and R93.7). Functional test abnormalities without clear diagnoses are covered in R94, such as abnormal EEGs (R94.01), electrocardiograms (R94.31), pulmonary function tests (R94.2), and kidney or liver function studies (R94.4 and R94.5). Including synonyms like “solitary nodule of lung” or “visual evoked potential abnormal” helps coders link clinical terms to these specific codes, ensuring precise classification of abnormal but undiagnosed findings identified through imaging and functional studies.
Questions About This Page
How many codes are in the R90-R94 range?
The R90-R94 range contains 85 ICD-10-CM diagnosis codes in FY 2026. 64 of them are billable, and the rest are category headers that organize the section.
What conditions does R90-R94 cover?
The range covers abnormal findings on diagnostic imaging and in function studies, without diagnosis. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
