Non-Billable / Non-Specific Code
ICD-10-CM R91 is the diagnosis code for Abnormal findings on diagnostic imaging of lung. This code falls under the section "Abnormal findings on diagnostic imaging and in function studies, without diagnosis" within Chapter 18 — Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where R91 sits in the ICD-10-CM classification helps ensure proper coding:
No, R91 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
R91 is the ICD-10-CM diagnosis code for "Abnormal findings on diagnostic imaging of lung". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
R91 is located in Section R90-R94 — "Abnormal findings on diagnostic imaging and in function studies, without diagnosis" within Chapter 18 of the ICD-10-CM Tabular List.
R91 has 2 sub-code(s) that provide more specific detail: R91.1, R91.8.
Use R91 when the patients documented diagnosis matches "Abnormal findings on diagnostic imaging of lung" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Abnormal findings on diagnostic imaging of lung is R91.
No, R91 is non-billable. Use a more specific sub-code for primary diagnosis billing.
R91 is in Chapter 18 of the ICD-10-CM Tabular List.
Yes, R91 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.