Billable / Specific Code
ICD-10-CM R40.2A is the diagnosis code for Nontraumatic coma due to underlying condition. 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 billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. 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 R40.2A. They are mutually exclusive:
Understanding where R40.2A sits in the ICD-10-CM classification helps ensure proper coding:
Yes, R40.2A is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
R40.2A is the ICD-10-CM diagnosis code for "Nontraumatic coma due to underlying condition". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of R40.2A is R40.2 ("Coma"). R40.2A provides a more specific classification within this category.
R40.2A 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.
Use R40.2A when the patients documented diagnosis matches "Nontraumatic coma due to underlying condition" 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 Nontraumatic coma due to underlying condition is R40.2A.
Yes, R40.2A can be used as a primary diagnosis code since it is billable and specific.
R40.2A is in Chapter 18 of the ICD-10-CM Tabular List.
Type 1 Excludes for R40.2A include: coma scale, best motor response (R40.24.-); coma scale, best verbal response (R40.22.-); coma scale, eyes open (R40.21.-) and more.
Yes, R40.2A is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.