G12.20: Motor neuron disease, unspecified

G12.20, motor neuron disease, unspecified, is listed as a covered diagnosis in 9 Medicare billing and coding articles that apply to 17 HCPCS Level II codes, including A7020 (Interface for cough stimulating device, includes all…), E0483 (High frequency chest wall oscillation system, with full…), A7025 (High frequency chest wall oscillation system vest…). 4 of these codes have a 2026 DMEPOS fee schedule amount; A7020 pays $19.87 to $23.81 (NU) depending on the state. The articles come from 5 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 G12.20 as a covered diagnosis

CodeDescriptionMedicare coverageDMEPOS fee 2026 (state range)Articles listing it
A7020Interface for cough stimulating device, includes all components, replacement onlyCarrier judgment$19.87–$23.81 (NU)1
E0483High frequency chest wall oscillation system, with full anterior and/or posterior thoracic region receiving simultaneous external oscillation, includes all accessories and supplies, eachCarrier judgment$1,515.12–$1,818.13 (RR)1
A7025High frequency chest wall oscillation system vest, replacement for use with patient owned equipment, eachCarrier judgment$61.99–$74.42 (RR)1
A7026High frequency chest wall oscillation system hose, replacement for use with patient owned equipment, eachCarrier judgment$40.96–$49.15 (NU)1
G2187Patients with clinical indications for imaging of the head: head traumaCarrier judgment—1
G2188Patients with clinical indications for imaging of the head: new or change in headache above 50 years of ageCarrier judgment—1
G2189Patients with clinical indications for imaging of the head: abnormal neurologic examCarrier judgment—1
G2190Patients with clinical indications for imaging of the head: headache radiating to the neckCarrier judgment—1
G2191Patients with clinical indications for imaging of the head: positional headachesCarrier judgment—1
G2192Patients with clinical indications for imaging of the head: temporal headaches in patients over 55 years of ageCarrier judgment—1
G2193Patients with clinical indications for imaging of the head: new onset headache in pre-school children or younger (<6 years of age)Carrier judgment—1
G2194Patients with clinical indications for imaging of the head: new onset headache in pediatric patients with disabilities for which headache is a concern as inferred from behaviorCarrier judgment—1
G2195Patients with clinical indications for imaging of the head: occipital headache in childrenCarrier judgment—1
G0283Electrical stimulation (unattended), to one or more areas for indication(s) other than wound care, as part of a therapy plan of careCarrier judgment—1
G0281Electrical stimulation, (unattended), to one or more areas, for chronic stage iii and stage iv pressure ulcers, arterial ulcers, diabetic ulcers, and venous stasis ulcers not demonstrating measurable signs of healing after 30 days of conventional care, as part of a therapy plan of careCarrier judgment—1
G0329Electromagnetic therapy, to one or more areas for chronic stage iii and stage iv pressure ulcers, arterial ulcers, diabetic ulcers and venous stasis ulcers not demonstrating measurable signs of healing after 30 days of conventional care as part of a therapy plan of careCarrier judgment—1
G0255Current perception threshold/sensory nerve conduction test, (snct) per limb, any nerveNon-covered by MedicareNot covered5

Medicare policy articles listing G12.20

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 G12 diagnoses (Spinal muscular atrophy and related syndromes)

Frequently asked questions

Does Medicare cover G12.20 (Motor neuron disease, unspecified)?

Medicare covers items and services, not diagnoses. 9 Medicare billing and coding articles list G12.20 as a covered diagnosis for 17 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 G12.20?

The Level II codes from the policies most specific to this diagnosis are A7020 (Interface for cough stimulating device, includes all…, 1 article); E0483 (High frequency chest wall oscillation system, with full…, 1 article); A7025 (High frequency chest wall oscillation system vest…, 1 article); A7026 (High frequency chest wall oscillation system hose…, 1 article); G2187 (Patients with clinical indications for imaging of the…, 1 article). Code choice depends on the item supplied; check each code's descriptor.

What does Medicare pay for equipment billed with G12.20?

Under the 2026 DMEPOS fee schedule (non-rural state fees): A7020 $19.87 to $23.81 (NU); E0483 $1,515.12 to $1,818.13 (RR); A7025 $61.99 to $74.42 (RR); A7026 $40.96 to $49.15 (NU). Medicare pays 80% of the allowed amount after the Part B deductible.

Which Medicare policy articles list G12.20?

A52510 (Mechanical In-exsufflation Devices - Policy Article); A52494 (High Frequency Chest Wall Oscillation Devices - Policy Article); A57307 (Billing and Coding: Nerve Conduction Studies and Electromyography), and 6 more articles.

What is ICD-10-CM code G12.20?

G12.20 is the ICD-10-CM code for motor neuron disease, unspecified, in category G12 (Spinal muscular atrophy and related syndromes), chapter 6: Diseases of the nervous system.

Next steps

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