G20.A2: Parkinson's disease without dyskinesia, with fluctuations
G20.A2, Parkinson's disease without dyskinesia, with fluctuations, is listed as a covered diagnosis in 11 Medicare billing and coding articles that apply to 75 HCPCS Level II codes, including G0340 (Image-guided robotic linear accelerator-based stereotactic…), G0339 (Image-guided robotic linear accelerator-based stereotactic…), G0451 (Development testing, with interpretation and report, per…). 25 of these codes have a 2026 DMEPOS fee schedule amount; E0783 pays $9,917.33 to $11,667.45 (NU) depending on the state. The articles come from 6 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 G20.A2 as a covered diagnosis
| Code | Description | Medicare coverage | DMEPOS fee 2026 (state range) | Articles listing it |
|---|---|---|---|---|
| G0340 | Image-guided robotic linear accelerator-based stereotactic radiosurgery, delivery including collimator changes and custom plugging, fractionated treatment, all lesions, per session, second through fifth sessions, maximum five sessions per course of treatment | Carrier judgment | — | 2 |
| G0339 | Image-guided robotic linear accelerator-based stereotactic radiosurgery, complete course of therapy in one session or first session of fractionated treatment | Carrier judgment | — | 2 |
| G0451 | Development testing, with interpretation and report, per standardized instrument form | Carrier judgment | — | 3 |
| G0563 | Stereotactic body radiation therapy, treatment delivery, per fraction to 1 or more lesions, including image guidance and real-time positron emissions-based delivery adjustments to 1 or more lesions, entire course not to exceed 5 fractions | Carrier judgment | — | 1 |
| E0783 | Infusion pump system, implantable, programmable (includes all components, e.g., pump, catheter, connectors, etc.) | Special coverage instructions apply | $9,917.33–$11,667.45 (NU) | 1 |
| E0786 | Implantable programmable infusion pump, replacement (excludes implantable intraspinal catheter) | Special coverage instructions apply | $10,969.75–$11,380.88 (NU) | 1 |
| E0782 | Infusion pump, implantable, non-programmable (includes all components, e.g., pump, catheter, connectors, etc.) | Special coverage instructions apply | $5,200.92–$6,118.73 (NU) | 1 |
| E0785 | Implantable intraspinal (epidural/intrathecal) catheter used with implantable infusion pump, replacement | Special coverage instructions apply | $572.38–$673.39 (KF) | 1 |
| E0784 | External ambulatory infusion pump, insulin | Special coverage instructions apply | $557.75–$635.90 (RR) | 1 |
| K0455 | Infusion pump used for uninterrupted parenteral administration of medication, (e.g., epoprostenol or treprostinol) | Special coverage instructions apply | $320.84–$483.38 (RR) | 1 |
| E0791 | Parenteral infusion pump, stationary, single or multi-channel | Special coverage instructions apply | $282.07–$427.07 (RR) | 1 |
| E0781 | Ambulatory infusion pump, single or multiple channels, electric or battery operated, with administrative equipment, worn by patient | Special coverage instructions apply | $309.33–$396.36 (RR) | 1 |
| E2103 | Non-adjunctive, non-implanted continuous glucose monitor or receiver | Carrier judgment | $256.09–$334.44 (NU) | 1 |
| A4239 | Supply allowance for non-adjunctive, non-implanted continuous glucose monitor (CGM), includes all supplies and accessories, 1 month supply = 1 unit of service | Carrier judgment | $273.28 | 1 |
| A4238 | Supply allowance for adjunctive, non-implanted continuous glucose monitor (CGM), includes all supplies and accessories, 1 month supply = 1 unit of service | Carrier judgment | $280.71 (KF) | 1 |
| E2102 | Adjunctive, non-implanted continuous glucose monitor or receiver | Carrier judgment | $189.08–$239.22 (NU) | 1 |
| A4222 | Infusion supplies for external drug infusion pump, per cassette or bag (list drugs separately) | Carrier judgment | $49.07–$62.94 | 1 |
| A4224 | Supplies for maintenance of insulin infusion catheter, per week | Carrier judgment | $25.87–$32.30 | 1 |
| A4221 | Supplies for maintenance of non-insulin drug infusion catheter, per week (list drugs separately) | Carrier judgment | $25.87–$32.30 | 1 |
| E0779 | Ambulatory infusion pump, mechanical, reusable, for infusion 8 hours or greater | Carrier judgment | $20.95–$27.85 (RR) | 1 |
| K0605 | Replacement battery for external infusion pump owned by patient, lithium, 4.5 volt, each | Carrier judgment | $20.45–$22.73 (NU) | 1 |
| E0780 | Ambulatory infusion pump, mechanical, reusable, for infusion less than 8 hours | Carrier judgment | $14.78–$16.43 (NU) | 1 |
| K0602 | Replacement battery for external infusion pump owned by patient, silver oxide, 3 volt, each | Carrier judgment | $8.88–$9.89 (NU) | 1 |
| K0604 | Replacement battery for external infusion pump owned by patient, lithium, 3.6 volt, each | Carrier judgment | $8.56–$9.50 (NU) | 1 |
| A4602 | Replacement battery for external infusion pump owned by patient, lithium, 1.5 volt, each | Carrier judgment | $5.31–$6.33 (NU) | 1 |
50 more codes are listed. See every code with payment by region in Caduvo.
Medicare policy articles listing G20.A2
- A56874: Billing and Coding: Stereotactic Radiation Therapy: Stereotactic Radiosurgery (SRS) and Stereotactic Body Radiation Therapy (SBRT) (Wellpoint Federal (MAC - Part A, MAC - Part B); 3 Level II codes). LCD with the same title: L35076
- A52507: External Infusion Pumps - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC); 55 Level II codes). LCD with the same title: L33794
- A59350: Billing and Coding: Radiation Therapies (Palmetto GBA (MAC - Part A, MAC - Part B); 2 Level II codes). LCD with the same title: L39553
- A57307: Billing and Coding: Nerve Conduction Studies and Electromyography (CGS Administrators, LLC (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- 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
- A54969: Billing and Coding: Nerve Conduction Studies and Electromyography (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- A57668: Billing and Coding: Nerve Conduction Studies and Electromyography (Wellpoint Federal (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- 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
- 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
- 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 G20 diagnoses (Parkinson's disease)
- G20.A1 — Parkinson's disease without dyskinesia, without mention of…
- G20.B1 — Parkinson's disease with dyskinesia, without mention of fluctuations
- G20.B2 — Parkinson's disease with dyskinesia, with fluctuations
- G20.C — Parkinsonism, unspecified
Frequently asked questions
Does Medicare cover G20.A2 (Parkinson's disease without dyskinesia, with fluctuations)?
Medicare covers items and services, not diagnoses. 11 Medicare billing and coding articles list G20.A2 as a covered diagnosis for 75 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 G20.A2?
The Level II codes from the policies most specific to this diagnosis are G0340 (Image-guided robotic linear accelerator-based stereotactic…, 2 articles); G0339 (Image-guided robotic linear accelerator-based stereotactic…, 2 articles); G0451 (Development testing, with interpretation and report, per…, 3 articles); G0563 (Stereotactic body radiation therapy, treatment delivery…, 1 article); E0783 (Infusion pump system, implantable, programmable (includes…, 1 article). Code choice depends on the item supplied; check each code's descriptor.
What does Medicare pay for equipment billed with G20.A2?
Under the 2026 DMEPOS fee schedule (non-rural state fees): E0783 $9,917.33 to $11,667.45 (NU); E0786 $10,969.75 to $11,380.88 (NU); E0782 $5,200.92 to $6,118.73 (NU); E0785 $572.38 to $673.39 (KF). Medicare pays 80% of the allowed amount after the Part B deductible.
Which Medicare policy articles list G20.A2?
A56874 (Billing and Coding: Stereotactic Radiation Therapy: Stereotactic Radiosurgery (SRS) and Stereotactic Body Radiation Therapy (SBRT)); A52507 (External Infusion Pumps - Policy Article); A59350 (Billing and Coding: Radiation Therapies), and 8 more articles.
What is ICD-10-CM code G20.A2?
G20.A2 is the ICD-10-CM code for Parkinson's disease without dyskinesia, with fluctuations, in category G20 (Parkinson's disease), chapter 6: Diseases of the nervous system.
Next steps
- Run a reimbursement report for a device billed under G0340
- Watch G0340 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for G0340
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