2021

  1. ICD-10-CM Codes
    2. ›
  2. R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    3. ›
  3. R90-R94 Abnormal findings on diagnostic imaging and in function studies, without diagnosis
    4. ›
  4. R91- Abnormal findings on diagnostic imaging of lung
    5. ›
  5. 2021 ICD-10-CM Diagnosis Code R91.1

2021 ICD-10-CM Diagnosis Code R91.1

Solitary pulmonary nodule

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • R91.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM R91.1 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of R91.1 - other international versions of ICD-10 R91.1 may differ.
Applicable To
  • Coin lesion lung
  • Solitary pulmonary nodule, subsegmental branch of the bronchial tree
The following code(s) above R91.1 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to R91.1:
  • R00-R99
    2021 ICD-10-CM Range R00-R99

    Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

    Note
    • This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
    • Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
    • The conditions and signs or symptoms included in categories R00-R94 consist of:
    • (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
    • (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
    • (c) provisional diagnosis in a patient who failed to return for further investigation or care;
    • (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
    • (e) cases in which a more precise diagnosis was not available for any other reason;
    • (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
    Type 2 Excludes
    • abnormal findings on antenatal screening of mother (O28.-)
    • certain conditions originating in the perinatal period (P04-P96)
    • signs and symptoms classified in the body system chapters
    • signs and symptoms of breast (N63, N64.5)
    Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
  • R90-R94
    2021 ICD-10-CM Range R90-R94

    Abnormal findings on diagnostic imaging and in function studies, without diagnosis

    Includes
    • 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
    • abnormal findings on antenatal screening of mother (O28.-)
    • diagnostic abnormal findings classified elsewhere - see Alphabetical Index
    Abnormal findings on diagnostic imaging and in function studies, without diagnosis
Approximate Synonyms
  • Pulmonary nodule
  • Solitary nodule of lung
Clinical Information
  • A lung lesion that appears as a round coin-shaped shadow in the chest radiographs.
  • A single lung lesion that is characterized by a small round mass of tissue, usually less than 1 cm in diameter, and can be detected by chest radiography. A solitary pulmonary nodule can be associated with neoplasm, tuberculosis, cyst, or other anomalies in the lung, the chest wall, or the pleura.
ICD-10-CM R91.1 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 205 Other respiratory system diagnoses with mcc
  • 206 Other respiratory system diagnoses without mcc

Convert R91.1 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to R91.1:
  • Lesion(s) (nontraumatic)
    • coin, lung R91.1
    • lung R91.1 (coin)
  • Nodule(s)
    • lung, solitary (subsegmental branch of the bronchial tree) R91.1
    • solitary, lung (subsegmental branch of the bronchial tree) R91.1
    • pulmonary, solitary R91.1 (subsegmental branch of the bronchial tree)

ICD-10-CM Codes Adjacent To R91.1
R89.7 Abnormal histological findings in specimens from other organs, systems and tissues
R89.8 Other abnormal findings in specimens from other organs, systems and tissues
R89.9 Unspecified abnormal finding in specimens from other organs, systems and tissues
R90 Abnormal findings on diagnostic imaging of central nervous system
R90.0 Intracranial space-occupying lesion found on diagnostic imaging of central nervous system
R90.8 Other abnormal findings on diagnostic imaging of central nervous system
R90.81 Abnormal echoencephalogram
R90.82 White matter disease, unspecified
R90.89 Other abnormal findings on diagnostic imaging of central nervous system
R91 Abnormal findings on diagnostic imaging of lung
R91.1 Solitary pulmonary nodule
R91.8 Other nonspecific abnormal finding of lung field
R92 Abnormal and inconclusive findings on diagnostic imaging of breast
R92.0 Mammographic microcalcification found on diagnostic imaging of breast
R92.1 Mammographic calcification found on diagnostic imaging of breast
R92.2 Inconclusive mammogram
R92.8 Other abnormal and inconclusive findings on diagnostic imaging of breast
R93 Abnormal findings on diagnostic imaging of other body structures
R93.0 Abnormal findings on diagnostic imaging of skull and head, not elsewhere classified
R93.1 Abnormal findings on diagnostic imaging of heart and coronary circulation
R93.2 Abnormal findings on diagnostic imaging of liver and biliary tract

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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