Alzheimer's Disease: ICD-10 Code G30.9
G30.9 is the ICD-10-CM code for Alzheimer's disease, unspecified. This code is used in medical documentation and billing to indicate a diagnosis of Alzheimer's disease when no further specific details about its progression or manifestations are provided [1] [4] [5]. The 2025 edition of ICD-10-CM G30.9 became effective on October 1, 2024 [1]. It is a billable and specific code, meaning it can be used for reimbursement purposes [1].
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Alzheimer's disease is a progressive, irreversible neurodegenerative disorder characterized by the degeneration of nerve cells and the deposition of certain proteins in the brain [5] [6]. While the exact cause is not fully understood, it leads to brain shrinkage and eventual loss of brain cells [6]. It is the most common form of dementia among older individuals, accounting for an estimated 60%-70% of dementia cases [6] [7]. Symptoms typically include a decline in memory, cognition, behavior, and social skills, which worsen over time [1] [6]. Common symptoms include memory loss, confusion, difficulty thinking, changes in language, behavior, and personality [1] [5]. Patients may struggle with daily activities, experience disorientation, and have difficulty with language [5]. While symptoms and progression vary, Alzheimer's is not considered a normal part of aging [6]. Onset can be early (between 30 and mid-60s, though rare) or, more commonly, late (after the mid-60s) [6].
For accurate coding of Alzheimer's disease, the ICD-10-CM system often requires two codes due to the etiology/manifestation convention [6] [8]. The primary code is from category G30 (Alzheimer's disease), and a secondary code from category F02 (Dementia in other diseases classified elsewhere) is used to specify the type and characteristics of the dementia [6] [8]. The F02 codes provide details on severity (mild, moderate, severe, unspecified) and the presence or absence of behavioral, psychotic, or mood disturbances, or anxiety [6] [8]. For instance, if a patient has Alzheimer's disease with behavioral disturbance, both G30.9 and an appropriate F02.81- code would be assigned [1] [2] [3]. The "Use Additional" notes under G30 indicate that codes for conditions like delirium (F05), dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4), behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-), mood disturbance (F02.83, F02.A3, F02.B3, F02.C3), psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2), or without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0) should be used if applicable [1] [2] [3].
Diagnosis of Alzheimer's disease typically involves a comprehensive clinical evaluation, including neurological examinations and neuropsychological testing to assess cognitive function [5]. Imaging studies like MRI or CT scans may show characteristic brain changes, though they are not definitive for diagnosis [5]. Other potential causes of dementia-like symptoms must be ruled out [5].
Relevant CPT codes for the treatment and management of Alzheimer's disease (ICD-10 G30.9) may include Evaluation and Management (E/M) services (CPT 99201-99215), neurobehavioral status exams (CPT 96116), neuropsychological testing (CPT 96132-96133), and care planning for cognitive impairment (CPT 99483) [5]. For patients requiring care in domiciliary settings or home visits, CPT codes 99324-99337 and 99341-99350, respectively, may be applicable [5].
Authoritative Sources
- ICD-10-CM Code G30.9. [ICD10Data.com]↩
- G30.9 Alzheimer's disease, unspecified. [AAPC.com]↩
- ICD-10-CM Diagnosis Code G30. [ICD10Data.com]↩
- G30.9 - Alzheimer's disease, unspecified. [Unbound Medicine]↩
- ICD code G30.9. [MD Clarity]↩
- Defining and Coding Alzheimer’s Disease. [HIA Code]↩
- Alzheimer's Disease Fact Sheet. [National Institute on Aging (NIA)]↩
- ICD-10-CM Official Guidelines for Coding and Reporting. [Centers for Medicare & Medicaid Services (CMS)]↩
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