N31.9: Neuromuscular dysfunction of bladder, unspecified
N31.9, neuromuscular dysfunction of bladder, unspecified, is listed as a covered diagnosis in 9 Medicare billing and coding articles that apply to 6 HCPCS Level II codes, including J0585 (Injection, onabotulinumtoxina, 1 unit), J0588 (Injection, incobotulinumtoxin a, 1 unit), J0586 (Injection, abobotulinumtoxina, 5 units). The articles come from 7 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 N31.9 as a covered diagnosis
| Code | Description | Medicare coverage | DMEPOS fee 2026 (state range) | Articles listing it |
|---|---|---|---|---|
| J0585 | Injection, onabotulinumtoxina, 1 unit | Special coverage instructions apply | — | 8 |
| J0588 | Injection, incobotulinumtoxin a, 1 unit | Carrier judgment | — | 8 |
| J0586 | Injection, abobotulinumtoxina, 5 units | Carrier judgment | — | 8 |
| J0587 | Injection, rimabotulinumtoxinb, 100 units | Special coverage instructions apply | — | 8 |
| J0589 | Injection, daxibotulinumtoxina-lanm, 1 unit | Carrier judgment | — | 8 |
| G0255 | Current perception threshold/sensory nerve conduction test, (snct) per limb, any nerve | Non-covered by Medicare | Not covered | 1 |
Medicare policy articles listing N31.9
- A57715: Billing and Coding: Botulinum Toxins (First Coast Service Options, Inc. (MAC - Part A, MAC - Part B); 5 Level II codes). LCD with the same title: L33274, L38809
- A58423: Billing and Coding: Botulinum Toxins (Novitas Solutions, Inc. (MAC - Part A, MAC - Part B); 5 Level II codes). LCD with the same title: L33274, L38809
- A57185: Billing and Coding: Botulinum Toxin Injections (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B); 5 Level II codes). LCD with the same title: L35170, L35172, L39832, L39836
- A57186: Billing and Coding: Botulinum Toxin Injections (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B); 5 Level II codes). LCD with the same title: L35170, L35172, L39832, L39836
- A59707: Billing and Coding: Botulinum Toxin Injections (Wellpoint Federal (MAC - Part A, MAC - Part B); 5 Level II codes). LCD with the same title: L35170, L35172, L39832, L39836
- A59714: Billing and Coding: Botulinum Toxin Injections (Palmetto GBA (MAC - Part A, MAC - Part B); 5 Level II codes). LCD with the same title: L35170, L35172, L39832, L39836
- A59726: Billing and Coding: Botulinum Toxins Injections (CGS Administrators, LLC (MAC - Part A, MAC - Part B); 5 Level II codes)
- A59809: Billing and Coding: Botulinum Toxin Injections (WPS Insurance Corporation (MAC - Part A, MAC - Part B); 5 Level II codes). LCD with the same title: L35170, L35172, L39832, L39836
- 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
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 N31 diagnoses (Neuromuscular dysfunction of bladder, not elsewhere classified)
- N31.1 — Reflex neuropathic bladder, not elsewhere classified
- N31.2 — Flaccid neuropathic bladder, not elsewhere classified
- N31.8 — Other neuromuscular dysfunction of bladder
Frequently asked questions
Does Medicare cover N31.9 (Neuromuscular dysfunction of bladder, unspecified)?
Medicare covers items and services, not diagnoses. 9 Medicare billing and coding articles list N31.9 as a covered diagnosis for 6 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 N31.9?
The Level II codes from the policies most specific to this diagnosis are J0585 (Injection, onabotulinumtoxina, 1 unit, 8 articles); J0588 (Injection, incobotulinumtoxin a, 1 unit, 8 articles); J0586 (Injection, abobotulinumtoxina, 5 units, 8 articles); J0587 (Injection, rimabotulinumtoxinb, 100 units, 8 articles); J0589 (Injection, daxibotulinumtoxina-lanm, 1 unit, 8 articles). Code choice depends on the item supplied; check each code's descriptor.
Which Medicare policy articles list N31.9?
A57715 (Billing and Coding: Botulinum Toxins); A58423 (Billing and Coding: Botulinum Toxins); A57185 (Billing and Coding: Botulinum Toxin Injections), and 6 more articles.
What is ICD-10-CM code N31.9?
N31.9 is the ICD-10-CM code for neuromuscular dysfunction of bladder, unspecified, in category N31 (Neuromuscular dysfunction of bladder, not elsewhere classified), chapter 14: Diseases of the genitourinary system.
Next steps
- Run a reimbursement report for a device billed under J0585
- Watch J0585 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for J0585
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 14: Diseases of the genitourinary system · All diagnoses · HCPCS lookup