Non-Billable / Non-Specific Code
ICD-10-CM R40 is the diagnosis code for Somnolence, stupor and coma. This code falls under the section "Symptoms and signs involving cognition, perception, emotional state and behavior" 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.
The following conditions should never be coded at the same time as R40. They are mutually exclusive:
Understanding where R40 sits in the ICD-10-CM classification helps ensure proper coding:
No, R40 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
R40 is the ICD-10-CM diagnosis code for "Somnolence, stupor and coma". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
R40 is located in Section R40-R46 — "Symptoms and signs involving cognition, perception, emotional state and behavior" within Chapter 18 of the ICD-10-CM Tabular List.
R40 has 5 sub-code(s) that provide more specific detail: R40.0, R40.1, R40.2, R40.3, R40.4.
Use R40 when the patients documented diagnosis matches "Somnolence, stupor and coma" 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 Somnolence, stupor and coma is R40.
No, R40 is non-billable. Use a more specific sub-code for primary diagnosis billing.
R40 is in Chapter 18 of the ICD-10-CM Tabular List.
Type 1 Excludes for R40 include: neonatal coma (P91.5); somnolence, stupor and coma in diabetes (E08-E13); somnolence, stupor and coma in hepatic failure (K72.-) and more.
Yes, R40 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.