G31.85: Corticobasal degeneration
G31.85, corticobasal degeneration, is listed as a covered diagnosis in 12 Medicare billing and coding articles that apply to 47 HCPCS Level II codes, including G0299 (Direct skilled nursing services of a registered nurse (rn)…), G0300 (Direct skilled nursing services of a licensed practical…), G0539 (Caregiver training in behavior management/modification for…). The articles come from 4 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.
HCPCS Level II codes with G31.85 as a covered diagnosis
| Code | Description | Medicare coverage | DMEPOS fee 2026 (state range) | Articles listing it |
|---|---|---|---|---|
| G0299 | Direct skilled nursing services of a registered nurse (rn) in the home health or hospice setting, each 15 minutes | Carrier judgment | — | 3 |
| G0300 | Direct skilled nursing services of a licensed practical nurse (lpn) in the home health or hospice setting, each 15 minutes | Carrier judgment | — | 3 |
| G0539 | Caregiver training in behavior management/modification for caregiver(s) of patients with a mental or physical health diagnosis, administered by physician or other qualified health care professional (without the patient present), face-to-face; initial 30 minutes | Carrier judgment | — | 1 |
| G0540 | Caregiver training in behavior management/modification for parent(s)/guardian(s)/caregiver(s) of patients with a mental or physical health diagnosis, administered by physician or other qualified health care professional (without the patient present), face-to-face; each additional 15 minutes | Carrier judgment | — | 1 |
| G0451 | Development testing, with interpretation and report, per standardized instrument form | Carrier judgment | — | 3 |
| G0153 | Services performed by a qualified speech-language pathologist in the home health or hospice setting, each 15 minutes | Carrier judgment | — | 1 |
| G0161 | Services performed by a qualified speech-language pathologist, in the home health setting, in the establishment or delivery of a safe and effective speech-language pathology maintenance program, each 15 minutes | Carrier judgment | — | 1 |
| G0152 | Services performed by a qualified occupational therapist in the home health or hospice setting, each 15 minutes | Carrier judgment | — | 2 |
| G0155 | Services of clinical social worker in home health or hospice settings, each 15 minutes | Carrier judgment | — | 1 |
| G0156 | Services of home health/hospice aide in home health or hospice settings, each 15 minutes | Carrier judgment | — | 1 |
| C8900 | Magnetic resonance angiography with contrast, abdomen | Special coverage instructions apply | — | 1 |
| C8901 | Magnetic resonance angiography without contrast, abdomen | Special coverage instructions apply | — | 1 |
| C8902 | Magnetic resonance angiography without contrast followed by with contrast, abdomen | Special coverage instructions apply | — | 1 |
| C8909 | Magnetic resonance angiography with contrast, chest (excluding myocardium) | Special coverage instructions apply | — | 1 |
| C8910 | Magnetic resonance angiography without contrast, chest (excluding myocardium) | Special coverage instructions apply | — | 1 |
| C8911 | Magnetic resonance angiography without contrast followed by with contrast, chest (excluding myocardium) | Special coverage instructions apply | — | 1 |
| C8912 | Magnetic resonance angiography with contrast, lower extremity | Special coverage instructions apply | — | 1 |
| C8913 | Magnetic resonance angiography without contrast, lower extremity | Special coverage instructions apply | — | 1 |
| C8914 | Magnetic resonance angiography without contrast followed by with contrast, lower extremity | Special coverage instructions apply | — | 1 |
| C8918 | Magnetic resonance angiography with contrast, pelvis | Special coverage instructions apply | — | 1 |
| C8919 | Magnetic resonance angiography without contrast, pelvis | Special coverage instructions apply | — | 1 |
| C8920 | Magnetic resonance angiography without contrast followed by with contrast, pelvis | Special coverage instructions apply | — | 1 |
| C8931 | Magnetic resonance angiography with contrast, spinal canal and contents | Special coverage instructions apply | — | 1 |
| C8932 | Magnetic resonance angiography without contrast, spinal canal and contents | Special coverage instructions apply | — | 1 |
| C8933 | Magnetic resonance angiography without contrast followed by with contrast, spinal canal and contents | Special coverage instructions apply | — | 1 |
22 more codes are listed. See every code with payment by region in Caduvo.
Medicare policy articles listing G31.85
- A56639: Billing and Coding: Hospice Alzheimer's Disease & Related Disorders (Palmetto GBA (HHH MAC); 2 Level II codes). LCD with the same title: L34567
- A56641: Billing and Coding: Home Health Skilled Nursing Care-Teaching and Training: Alzheimer's Disease and Behavioral Disturbances (Palmetto GBA (HHH MAC); 4 Level II codes). LCD with the same title: L34562
- A53052: Billing and Coding: Home Health Speech-Language Pathology (Palmetto GBA (HHH MAC); 2 Level II codes). LCD with the same title: L34563
- A56756: Billing and Coding: Home Health - Psychiatric Care (Palmetto GBA (HHH MAC); 5 Level II codes). LCD with the same title: L34561
- A56775: Billing and Coding: Magnetic Resonance Angiography (Palmetto GBA (MAC - Part A, MAC - Part B); 18 Level II codes). LCD with the same title: L34424
- A56937: Billing and Coding: Psychiatry and Psychology Services (Wellpoint Federal (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L33632, L34616
- A57130: Billing and Coding: Psychiatric Codes (Novitas Solutions, Inc. (MAC - Part A, MAC - Part B); 4 Level II codes). LCD with the same title: L35101
- A57780: Billing and Coding: Psychological and Neuropsychological Tests (First Coast Service Options, Inc. (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34520
- A56619: Billing and Coding: Nerve Conduction Studies and Electromyography (Palmetto GBA (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- A56612: Billing and Coding: CT of the Head (Palmetto GBA (MAC - Part A, MAC - Part B); 9 Level II codes). LCD with the same title: L34417
- A53057: Billing and Coding: Home Health Occupational Therapy (Palmetto GBA (HHH MAC); 5 Level II codes). LCD with the same title: L34560
- A53064: Billing and Coding: Outpatient Occupational Therapy (Palmetto GBA (MAC - Part A); 3 Level II codes). LCD with the same title: L34427
A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.
Other G31 diagnoses (Other degenerative diseases of nervous system, not elsewhere classified)
- G31.80 — Leukodystrophy, unspecified
- G31.83 — Neurocognitive disorder with Lewy bodies
- G31.84 — Mild cognitive impairment of uncertain or unknown etiology
- G31.86 — Alexander disease
- G31.87 — Primary progressive apraxia of speech
- G31.01 — Pick's disease
- G31.09 — Other frontotemporal neurocognitive disorder
- G31.1 — Senile degeneration of brain, not elsewhere classified
- G31.9 — Degenerative disease of nervous system, unspecified
Frequently asked questions
Does Medicare cover G31.85 (Corticobasal degeneration)?
Medicare covers items and services, not diagnoses. 12 Medicare billing and coding articles list G31.85 as a covered diagnosis for 47 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.
Which HCPCS codes can be billed with ICD-10 G31.85?
The Level II codes from the policies most specific to this diagnosis are G0299 (Direct skilled nursing services of a registered nurse (rn)…, 3 articles); G0300 (Direct skilled nursing services of a licensed practical…, 3 articles); G0539 (Caregiver training in behavior management/modification for…, 1 article); G0540 (Caregiver training in behavior management/modification for…, 1 article); G0451 (Development testing, with interpretation and report, per…, 3 articles). Code choice depends on the item supplied; check each code's descriptor.
Which Medicare policy articles list G31.85?
A56639 (Billing and Coding: Hospice Alzheimer's Disease & Related Disorders); A56641 (Billing and Coding: Home Health Skilled Nursing Care-Teaching and Training: Alzheimer's Disease and Behavioral Disturbances); A53052 (Billing and Coding: Home Health Speech-Language Pathology), and 9 more articles.
What is ICD-10-CM code G31.85?
G31.85 is the ICD-10-CM code for corticobasal degeneration, in category G31 (Other degenerative diseases of nervous system, not elsewhere classified), chapter 6: Diseases of the nervous system.
Next steps
- Run a reimbursement report for a device billed under G0299
- Watch G0299 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for G0299
Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.
Chapter 6: Diseases of the nervous system · All diagnoses · HCPCS lookup