M99.50: Intervertebral disc stenosis of neural canal of head region
M99.50, intervertebral disc stenosis of neural canal of head region, is listed as a covered diagnosis in 10 Medicare billing and coding articles that apply to 19 HCPCS Level II codes, including G0283 (Electrical stimulation (unattended), to one or more areas…), G0453 (Continuous intraoperative neurophysiology monitoring, from…), E0783 (Infusion pump system, implantable, programmable (includes…). 4 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 M99.50 as a covered diagnosis
| Code | Description | Medicare coverage | DMEPOS fee 2026 (state range) | Articles listing it |
|---|---|---|---|---|
| G0283 | Electrical stimulation (unattended), to one or more areas for indication(s) other than wound care, as part of a therapy plan of care | Carrier judgment | — | 3 |
| G0453 | Continuous intraoperative neurophysiology monitoring, from outside the operating room (remote or nearby), per patient, (attention directed exclusively to one patient) each 15 minutes (list in addition to primary procedure) | 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 |
| J7999 | Compounded drug, not otherwise classified | Special coverage instructions apply | — | 1 |
| J2278 | Injection, ziconotide, 1 microgram | Special coverage instructions apply | — | 1 |
| J2274 | Injection, morphine sulfate, preservative-free for epidural or intrathecal use, 10 mg | Special coverage instructions apply | — | 1 |
| A4220 | Refill kit for implantable infusion pump | Special coverage instructions apply | — | 1 |
| J9200 | Injection, floxuridine, 500 mg | Special coverage instructions apply | — | 1 |
| G0152 | Services performed by a qualified occupational therapist in the home health or hospice setting, each 15 minutes | Carrier judgment | — | 1 |
| G0158 | Services performed by a qualified occupational therapist assistant in the home health or hospice setting, each 15 minutes | Carrier judgment | — | 1 |
| G0160 | Services performed by a qualified occupational therapist, in the home health setting, in the establishment or delivery of a safe and effective occupational therapy maintenance program, each 15 minutes | Carrier judgment | — | 1 |
| G2169 | Services performed by an occupational therapist assistant in the home health setting in the delivery of a safe and effective occupational therapy maintenance program, each 15 minutes | Carrier judgment | — | 1 |
| G0281 | Electrical 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 care | Carrier judgment | — | 1 |
| G0329 | Electromagnetic 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 care | Carrier judgment | — | 1 |
| G0255 | Current perception threshold/sensory nerve conduction test, (snct) per limb, any nerve | Non-covered by Medicare | Not covered | 5 |
| G0282 | Electrical stimulation, (unattended), to one or more areas, for wound care other than described in g0281 | Non-covered by Medicare | Not covered | 1 |
Medicare policy articles listing M99.50
- A56034: Billing and Coding: Nerve Blockade for Treatment of Chronic Pain and Neuropathy (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B); 2 Level II codes). LCD with the same title: L35456
- A56722: Billing and Coding: Intraoperative Neurophysiological Testing (Novitas Solutions, Inc. (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34623, L35003
- 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
- A57478: Billing and Coding: Nerve Conduction Studies and Electromyography (WPS Insurance Corporation (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- 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
- 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
- A56695: Billing and Coding: Implantable Infusion Pump (Palmetto GBA (MAC - Part B); 9 Level II codes). LCD with the same title: L33461
- 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 M99 diagnoses (Biomechanical lesions, not elsewhere classified)
- M99.51 — Intervertebral disc stenosis of neural canal of cervical region
- M99.52 — Intervertebral disc stenosis of neural canal of thoracic region
- M99.53 — Intervertebral disc stenosis of neural canal of lumbar region
- M99.54 — Intervertebral disc stenosis of neural canal of sacral region
- M99.55 — Intervertebral disc stenosis of neural canal of pelvic region
- M99.56 — Intervertebral disc stenosis of neural canal of lower extremity
- M99.57 — Intervertebral disc stenosis of neural canal of upper extremity
- M99.58 — Intervertebral disc stenosis of neural canal of rib cage
- M99.59 — Intervertebral disc stenosis of neural canal of abdomen and other…
- M99.20 — Subluxation stenosis of neural canal of head region
- M99.21 — Subluxation stenosis of neural canal of cervical region
- M99.22 — Subluxation stenosis of neural canal of thoracic region
- M99.23 — Subluxation stenosis of neural canal of lumbar region
- M99.24 — Subluxation stenosis of neural canal of sacral region
- M99.25 — Subluxation stenosis of neural canal of pelvic region
- M99.26 — Subluxation stenosis of neural canal of lower extremity
- M99.27 — Subluxation stenosis of neural canal of upper extremity
- M99.28 — Subluxation stenosis of neural canal of rib cage
- M99.29 — Subluxation stenosis of neural canal of abdomen and other regions
- M99.30 — Osseous stenosis of neural canal of head region
- M99.31 — Osseous stenosis of neural canal of cervical region
- M99.32 — Osseous stenosis of neural canal of thoracic region
- M99.33 — Osseous stenosis of neural canal of lumbar region
- M99.34 — Osseous stenosis of neural canal of sacral region
- M99.35 — Osseous stenosis of neural canal of pelvic region
- M99.36 — Osseous stenosis of neural canal of lower extremity
- M99.37 — Osseous stenosis of neural canal of upper extremity
- M99.38 — Osseous stenosis of neural canal of rib cage
- M99.39 — Osseous stenosis of neural canal of abdomen and other regions
- M99.40 — Connective tissue stenosis of neural canal of head region
Frequently asked questions
Does Medicare cover M99.50 (Intervertebral disc stenosis of neural canal of head region)?
Medicare covers items and services, not diagnoses. 10 Medicare billing and coding articles list M99.50 as a covered diagnosis for 19 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 M99.50?
The Level II codes from the policies most specific to this diagnosis are G0283 (Electrical stimulation (unattended), to one or more areas…, 3 articles); G0453 (Continuous intraoperative neurophysiology monitoring, from…, 1 article); E0783 (Infusion pump system, implantable, programmable (includes…, 1 article); E0786 (Implantable programmable infusion pump, replacement…, 1 article); E0782 (Infusion pump, implantable, non-programmable (includes all…, 1 article). Code choice depends on the item supplied; check each code's descriptor.
What does Medicare pay for equipment billed with M99.50?
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 M99.50?
A56034 (Billing and Coding: Nerve Blockade for Treatment of Chronic Pain and Neuropathy); A56722 (Billing and Coding: Intraoperative Neurophysiological Testing); A57307 (Billing and Coding: Nerve Conduction Studies and Electromyography), and 7 more articles.
What is ICD-10-CM code M99.50?
M99.50 is the ICD-10-CM code for intervertebral disc stenosis of neural canal of head region, in category M99 (Biomechanical lesions, not elsewhere classified), chapter 13: Diseases of the musculoskeletal system and connective tissue.
Next steps
- Run a reimbursement report for a device billed under G0283
- Watch G0283 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for G0283
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 13: Diseases of the musculoskeletal system and connective tissue · All diagnoses · HCPCS lookup