A50.40 — Late congenital neurosyphilis, unspecified
A50.40 is a billable, specific ICD-10-CM code for late congenital neurosyphilis, unspecified. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Juvenile neurosyphilis NOS
Risk adjustment
A50.40 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
A50.40 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52996Billing and Coding: Routine Foot Care
- A56937Billing and Coding: Psychiatry and Psychology Services
- A57065Billing and Coding: Outpatient Psychiatry and Psychology Services
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
How A50.40 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 A50.40.
- Neurosyphilis›congenital
- Neurosyphilis›juvenile(asymptomatic) (meningeal)
- Syphilis, syphilitic›central nervous system›congenital
- Syphilis, syphilitic›central nervous system›juvenile
Related codes at this level
Codes that share A50.4. If A50.40 is not quite right, the correct code is usually one of these.
Questions about A50.40
- Is A50.40 a billable ICD-10-CM code?
- Yes. A50.40 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does A50.40 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Infections with a predominantly sexual mode of transmission (A50-A64).