Billable / Specific Code
ICD-10-CM G31.84 is the diagnosis code for Mild cognitive impairment of uncertain or unknown etiology. This code falls under the section "Other degenerative diseases of the nervous system" within Chapter 6 — Diseases of the nervous system (G00-G99). 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 G31.84. They are mutually exclusive:
Understanding where G31.84 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, G31.84 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
G31.84 is the ICD-10-CM diagnosis code for "Mild cognitive impairment of uncertain or unknown etiology". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of G31.84 is G31.8 ("Other specified degenerative diseases of nervous system"). G31.84 provides a more specific classification within this category.
G31.84 is located in Section G30-G32 — "Other degenerative diseases of the nervous system" within Chapter 6 of the ICD-10-CM Tabular List.
Use G31.84 when the patients documented diagnosis matches "Mild cognitive impairment of uncertain or unknown etiology" 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 Mild cognitive impairment of uncertain or unknown etiology is G31.84.
Yes, G31.84 can be used as a primary diagnosis code since it is billable and specific.
G31.84 is in Chapter 6 of the ICD-10-CM Tabular List.
Type 1 Excludes for G31.84 include: age related cognitive decline (R41.81); altered mental status (R41.82); cerebral degeneration (G31.9) and more.
Yes, G31.84 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.