G20.B1: Parkinson's disease with dyskinesia, without mention of fluctuations
G20.B1, Parkinson's disease with dyskinesia, without mention of 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.B1 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.B1
- 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.B2 — Parkinson's disease with dyskinesia, with fluctuations
- G20.A1 — Parkinson's disease without dyskinesia, without mention of…
- G20.A2 — Parkinson's disease without dyskinesia, with fluctuations
- G20.C — Parkinsonism, unspecified
Frequently asked questions
Does Medicare cover G20.B1 (Parkinson's disease with dyskinesia, without mention of…)?
Medicare covers items and services, not diagnoses. 11 Medicare billing and coding articles list G20.B1 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.B1?
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.B1?
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.B1?
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.B1?
G20.B1 is the ICD-10-CM code for Parkinson's disease with dyskinesia, without mention of 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