N31.8 — Other neuromuscular dysfunction of bladder
N31.8 is a billable, specific ICD-10-CM code for other neuromuscular dysfunction of bladder. It is valid for submission on a claim.
Excludes1 inherited from the categories above N31.8
These are not written on N31.8, but they bind it: a note on a category applies to every code beneath it. Billing N31.8 with anything listed here is a denial.
Other codes that can never be billed with N31.8
These codes carry an Excludes1 note pointing at N31.8. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading N31.8 alone.
Risk adjustment
N31.8 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
N31.8 is named in 18 Medicare coverage policies — 18 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A54095Billing and Coding: Nerve Conduction Studies and Electromyography
- A55336Billing and Coding: Retroperitoneal Ultrasound
- A56802Billing and Coding: Urodynamics
- A57123Billing and Coding: Nerve Conduction Studies and Electromyography
How N31.8 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to N31.8.
- Hypertony, hypertonia, hypertonicity›bladder
- Atrophy, atrophic›bladder›neurogenic
- Dysfunction›bladder›neuromuscular NOS›specified NEC
Code history
N31.8 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share N31. If N31.8 is not quite right, the correct code is usually one of these.
Questions about N31.8
- Is N31.8 a billable ICD-10-CM code?
- Yes. N31.8 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does N31.8 sit in the tabular list?
- Diseases of the genitourinary system (N00-N99), in the block Other diseases of the urinary system (N30-N39).
- What cannot be coded together with N31.8?
- N31.8 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above N31.8 (N31) and apply to it just the same.